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Institute of Archaeology and History of Art of Cluj-Napoca</p></div></div><div class="suggested-user-card"><div class="suggested-user-card__avatar social-profile-avatar-container"><a href="https://uludag.academia.edu/KamilDo%C4%9Fanc%C4%B1"><img class="profile-avatar u-positionAbsolute" alt="Kamil Doğancı" border="0" onerror="if (this.src != '//a.academia-assets.com/images/s200_no_pic.png') this.src = '//a.academia-assets.com/images/s200_no_pic.png';" width="200" height="200" src="https://0.academia-photos.com/1288065/473297/596326/s200_kamil.do_anc_.jpg" /></a></div><div class="suggested-user-card__user-info"><a class="suggested-user-card__user-info__header ds2-5-body-sm-bold ds2-5-body-link" href="https://uludag.academia.edu/KamilDo%C4%9Fanc%C4%B1">Kamil Doğancı</a><p class="suggested-user-card__user-info__subheader ds2-5-body-xs">Uludag University</p></div></div><div class="suggested-user-card"><div class="suggested-user-card__avatar social-profile-avatar-container"><a href="https://cnrs.academia.edu/MKazanski"><img class="profile-avatar u-positionAbsolute" alt="Michel Kazanski" border="0" onerror="if (this.src != '//a.academia-assets.com/images/s200_no_pic.png') this.src = '//a.academia-assets.com/images/s200_no_pic.png';" width="200" height="200" src="https://0.academia-photos.com/1820333/620900/770553/s200_michel.kazanski.jpg" /></a></div><div class="suggested-user-card__user-info"><a class="suggested-user-card__user-info__header ds2-5-body-sm-bold ds2-5-body-link" href="https://cnrs.academia.edu/MKazanski">Michel Kazanski</a><p class="suggested-user-card__user-info__subheader ds2-5-body-xs">Centre National de la Recherche Scientifique / French National Centre for Scientific Research</p></div></div><div class="suggested-user-card"><div class="suggested-user-card__avatar social-profile-avatar-container"><a href="https://su-se.academia.edu/ViacheslavKuleshov"><img class="profile-avatar u-positionAbsolute" alt="Viacheslav Kuleshov" border="0" onerror="if (this.src != '//a.academia-assets.com/images/s200_no_pic.png') this.src = '//a.academia-assets.com/images/s200_no_pic.png';" width="200" height="200" src="https://0.academia-photos.com/1895779/1756649/167070895/s200_viacheslav.kuleshov.jpg" /></a></div><div class="suggested-user-card__user-info"><a class="suggested-user-card__user-info__header ds2-5-body-sm-bold ds2-5-body-link" href="https://su-se.academia.edu/ViacheslavKuleshov">Viacheslav Kuleshov</a><p class="suggested-user-card__user-info__subheader ds2-5-body-xs">Stockholm University</p></div></div></ul></div><div class="ri-section"><div class="ri-section-header"><span>Interests</span></div><div class="ri-tags-container"><a data-click-track="profile-user-info-expand-research-interests" data-has-card-for-ri-list="34310257" href="https://www.academia.edu/Documents/in/Archaeology_Of_The_Migration_Period_And_The_Early_Middle_Ages"><div id="js-react-on-rails-context" style="display:none" 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class="documents-container backbone-social-profile-documents" style="width: 100%;"><div class="u-taCenter"></div><div class="profile--tab_content_container js-tab-pane tab-pane active" id="all"><div class="profile--tab_heading_container js-section-heading" data-section="Papers" id="Papers"><h3 class="profile--tab_heading_container">Papers by Christian Bigler</h3></div><div class="js-work-strip profile--work_container" data-work-id="117822089"><div class="profile--work_thumbnail hidden-xs"><a class="js-work-strip-work-link" data-click-track="profile-work-strip-thumbnail" href="https://www.academia.edu/117822089/Composition_and_dispersal_of_riverine_and_lake_phytoplankton_communities_in_connected_systems_with_different_water_retention_times"><img alt="Research paper thumbnail of Composition and dispersal of riverine and lake phytoplankton communities in connected systems with different water retention times" class="work-thumbnail" src="https://attachments.academia-assets.com/113586229/thumbnails/1.jpg" /></a></div><div class="wp-workCard wp-workCard_itemContainer"><div class="wp-workCard_item wp-workCard--title"><a class="js-work-strip-work-link text-gray-darker" data-click-track="profile-work-strip-title" href="https://www.academia.edu/117822089/Composition_and_dispersal_of_riverine_and_lake_phytoplankton_communities_in_connected_systems_with_different_water_retention_times">Composition and dispersal of riverine and lake phytoplankton communities in connected systems with different water retention times</a></div><div class="wp-workCard_item"><span>Freshwater Biology</span><span>, Dec 1, 2008</span></div><div class="wp-workCard_item"><span class="js-work-more-abstract-truncated">1. Lake phytoplankton community structure may be influenced by both internal factors (predation, ...</span><a class="js-work-more-abstract" data-broccoli-component="work_strip.more_abstract" data-click-track="profile-work-strip-more-abstract" href="javascript:;"><span> more </span><span><i class="fa fa-caret-down"></i></span></a><span class="js-work-more-abstract-untruncated hidden">1. Lake phytoplankton community structure may be influenced by both internal factors (predation, competition, resource constraints) and external ones, such as dispersal of materials and cells between connected habitats. However, little is known about the importance of cell dispersal for phytoplankton community structure in lakes. 2. We investigated the abundance and dispersal of phytoplankton cells between connected rivers and lakes, and analysed whether similarities in phytoplankton community composition between rivers and lakes were primarily related to cell import rates or to characteristics of the local habitat. We focused on lakes along a gradient of theoretical water retention times (TWRT). Two data sets from Swedish lakes were used; a seasonal study of two connected boreal forest lakes, differing in TWRT, and a multi-lake study of 13 lakes with a continuous range of TWRTs. 3. Phytoplankton cells were transported and dispersed in all investigated rivers. In the seasonal study, cell import rates and similarities in phytoplankton community composition between the lake and its inlet(s) were much higher in the lake with a shorter TWRT. Phytoplankton community structure in different habitats was associated with total organic carbon (TOC). This indicates that local habitat characteristics may be important in determining lake phytoplankton community composition, even in the presence of substantial cell import. 4. The multi-lake study also showed a negative relationship between TWRT and similarities in phytoplankton community composition between inlets and lakes. Moreover, similarity in community structure was related to both cell import rates from inlet to lake and differences in habitat characteristics between inlet and lake. However, the variable most strongly correlated with community structure was TOC, indicating that species sorting rather than a mass effect was the most important mechanism underlying the correlation between community structure and retention time. 5. Overall, our data suggest that local habitat characteristics may play a key role in determining community similarity in this set of lakes covering a large range of habitat connectedness. Due to the strong co-variations between cell dispersal and TOC, it was hard to unequivocally disentangle the different mechanisms; hence, there is a need for further studies of the role of dispersal for phytoplankton community structures.</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><a id="1305291c8e0b93100d54599e95d107a4" class="wp-workCard--action" rel="nofollow" data-click-track="profile-work-strip-download" data-download="{"attachment_id":113586229,"asset_id":117822089,"asset_type":"Work","button_location":"profile"}" href="https://www.academia.edu/attachments/113586229/download_file?s=profile"><span><i class="fa fa-arrow-down"></i></span><span>Download</span></a><span class="wp-workCard--action visible-if-viewed-by-owner inline-block" style="display: none;"><span class="js-profile-work-strip-edit-button-wrapper profile-work-strip-edit-button-wrapper" data-work-id="117822089"><a class="js-profile-work-strip-edit-button" tabindex="0"><span><i class="fa fa-pencil"></i></span><span>Edit</span></a></span></span></div><div class="wp-workCard_item wp-workCard--stats"><span><span><span class="js-view-count view-count u-mr2x" data-work-id="117822089"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 117822089; 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$(this).data('initialized', true); } }); $a.trackClickSource(".js-work-strip-work-link", "profile_work_strip") }); </script> <div class="js-work-strip profile--work_container" data-work-id="117822088"><div class="profile--work_thumbnail hidden-xs"><a class="js-work-strip-work-link" data-click-track="profile-work-strip-thumbnail" href="https://www.academia.edu/117822088/Environmental_history_A_piece_in_the_puzzle_for_establishing_plans_for_environmental_management"><img alt="Research paper thumbnail of Environmental history: A piece in the puzzle for establishing plans for environmental management" class="work-thumbnail" src="https://attachments.academia-assets.com/113586232/thumbnails/1.jpg" /></a></div><div class="wp-workCard wp-workCard_itemContainer"><div class="wp-workCard_item wp-workCard--title"><a class="js-work-strip-work-link text-gray-darker" data-click-track="profile-work-strip-title" href="https://www.academia.edu/117822088/Environmental_history_A_piece_in_the_puzzle_for_establishing_plans_for_environmental_management">Environmental history: A piece in the puzzle for establishing plans for environmental management</a></div><div class="wp-workCard_item"><span>Journal of Environmental Management</span><span>, Jun 1, 2009</span></div><div class="wp-workCard_item"><span class="js-work-more-abstract-truncated">Establishment of plans for environmental planning and management requires that a number of natura...</span><a class="js-work-more-abstract" data-broccoli-component="work_strip.more_abstract" data-click-track="profile-work-strip-more-abstract" href="javascript:;"><span> more </span><span><i class="fa fa-caret-down"></i></span></a><span class="js-work-more-abstract-untruncated hidden">Establishment of plans for environmental planning and management requires that a number of natural and societal factors must be taken into consideration. Insights into the inherent dynamics of nature as well as the role that past human activities have played for establishing the current condition of the landscape and the natural environment in general are essential. Many natural and man-made changes occur over time scales of decades or centuries, and these are difficult to comprehend without a historical perspective. Such a perspective can be obtained using palaeoecological studies, i.e. by geochemical and biological analyses of lake sediment and peat deposits. To illustrate the long-term dynamics of nature and particularly the role of man, we present here five case studies from Sweden concerning pollution, lake acidification, lake eutrophication, biodiversity, and landscape dynamics and conservation-topics of broad interests-and discuss benefits of including a longer time perspective in environmental management.</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><a id="592f49d9e7ad8b2454ad8f809e974d99" class="wp-workCard--action" rel="nofollow" data-click-track="profile-work-strip-download" data-download="{"attachment_id":113586232,"asset_id":117822088,"asset_type":"Work","button_location":"profile"}" href="https://www.academia.edu/attachments/113586232/download_file?s=profile"><span><i class="fa fa-arrow-down"></i></span><span>Download</span></a><span class="wp-workCard--action visible-if-viewed-by-owner inline-block" style="display: none;"><span class="js-profile-work-strip-edit-button-wrapper profile-work-strip-edit-button-wrapper" data-work-id="117822088"><a class="js-profile-work-strip-edit-button" tabindex="0"><span><i class="fa fa-pencil"></i></span><span>Edit</span></a></span></span></div><div class="wp-workCard_item wp-workCard--stats"><span><span><span class="js-view-count view-count u-mr2x" data-work-id="117822088"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 117822088; 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$(this).data('initialized', true); } }); $a.trackClickSource(".js-work-strip-work-link", "profile_work_strip") }); </script> <div class="js-work-strip profile--work_container" data-work-id="117822087"><div class="profile--work_thumbnail hidden-xs"><a class="js-work-strip-work-link" data-click-track="profile-work-strip-thumbnail" href="https://www.academia.edu/117822087/Early_land_use_and_centennial_scale_changes_in_lake_water_organic_carbon_prior_to_contemporary_monitoring"><img alt="Research paper thumbnail of Early land use and centennial scale changes in lake-water organic carbon prior to contemporary monitoring" class="work-thumbnail" src="https://attachments.academia-assets.com/113586231/thumbnails/1.jpg" /></a></div><div class="wp-workCard wp-workCard_itemContainer"><div class="wp-workCard_item wp-workCard--title"><a class="js-work-strip-work-link text-gray-darker" data-click-track="profile-work-strip-title" href="https://www.academia.edu/117822087/Early_land_use_and_centennial_scale_changes_in_lake_water_organic_carbon_prior_to_contemporary_monitoring">Early land use and centennial scale changes in lake-water organic carbon prior to contemporary monitoring</a></div><div class="wp-workCard_item"><span>Proceedings of the National Academy of Sciences of the United States of America</span><span>, May 11, 2015</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><a id="eddf177da3010bf952717a4ed6bd2de8" class="wp-workCard--action" rel="nofollow" data-click-track="profile-work-strip-download" data-download="{"attachment_id":113586231,"asset_id":117822087,"asset_type":"Work","button_location":"profile"}" href="https://www.academia.edu/attachments/113586231/download_file?s=profile"><span><i class="fa fa-arrow-down"></i></span><span>Download</span></a><span class="wp-workCard--action visible-if-viewed-by-owner inline-block" style="display: none;"><span class="js-profile-work-strip-edit-button-wrapper profile-work-strip-edit-button-wrapper" data-work-id="117822087"><a class="js-profile-work-strip-edit-button" tabindex="0"><span><i class="fa fa-pencil"></i></span><span>Edit</span></a></span></span></div><div class="wp-workCard_item wp-workCard--stats"><span><span><span class="js-view-count view-count u-mr2x" data-work-id="117822087"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 117822087; window.Academia.workViewCountsFetcher.queue(workId, function (count) { var description = window.$h.commaizeInt(count) + " " + window.$h.pluralize(count, 'View'); $(".js-view-count[data-work-id=117822087]").text(description); $(".js-view-count[data-work-id=117822087]").attr('title', description).tooltip(); }); });</script></span></span><span><span class="percentile-widget hidden"><span class="u-mr2x work-percentile"></span></span><script>$(function () { var workId = 117822087; window.Academia.workPercentilesFetcher.queue(workId, function (percentileText) { var container = $(".js-work-strip[data-work-id='117822087']"); container.find('.work-percentile').text(percentileText.charAt(0).toUpperCase() + percentileText.slice(1)); container.find('.percentile-widget').show(); container.find('.percentile-widget').removeClass('hidden'); }); });</script></span></div><div id="work-strip-premium-row-container"></div></div></div><script> require.config({ waitSeconds: 90 })(["https://a.academia-assets.com/assets/wow_profile-a9bf3a2bc8c89fa2a77156577594264ee8a0f214d74241bc0fcd3f69f8d107ac.js","https://a.academia-assets.com/assets/work_edit-ad038b8c047c1a8d4fa01b402d530ff93c45fee2137a149a4a5398bc8ad67560.js"], function() { // from javascript_helper.rb var dispatcherData = {} if (true){ window.WowProfile.dispatcher = window.WowProfile.dispatcher || _.clone(Backbone.Events); dispatcherData = { dispatcher: window.WowProfile.dispatcher, downloadLinkId: "eddf177da3010bf952717a4ed6bd2de8" } } $('.js-work-strip[data-work-id=117822087]').each(function() { if (!$(this).data('initialized')) { new WowProfile.WorkStripView({ el: this, workJSON: {"id":117822087,"title":"Early land use and centennial scale changes in lake-water organic carbon prior to contemporary monitoring","internal_url":"https://www.academia.edu/117822087/Early_land_use_and_centennial_scale_changes_in_lake_water_organic_carbon_prior_to_contemporary_monitoring","owner_id":34310257,"coauthors_can_edit":true,"owner":{"id":34310257,"first_name":"Christian","middle_initials":null,"last_name":"Bigler","page_name":"ChristianBigler","domain_name":"independent","created_at":"2015-08-27T23:00:36.425-07:00","display_name":"Christian Bigler","url":"https://independent.academia.edu/ChristianBigler"},"attachments":[{"id":113586231,"title":"","file_type":"pdf","scribd_thumbnail_url":"https://attachments.academia-assets.com/113586231/thumbnails/1.jpg","file_name":"pmc4450393.pdf","download_url":"https://www.academia.edu/attachments/113586231/download_file","bulk_download_file_name":"Early_land_use_and_centennial_scale_chan.pdf","bulk_download_url":"https://d1wqtxts1xzle7.cloudfront.net/113586231/pmc4450393-libre.pdf?1713707110=\u0026response-content-disposition=attachment%3B+filename%3DEarly_land_use_and_centennial_scale_chan.pdf\u0026Expires=1740603563\u0026Signature=K-zMBu1H1RW2KLIW5DlEL13J4r0u6EfIYAzU8mpEdEMyqfV80IH7SgZVYnnduZTh4gHNcLxlOh7lp0I-9mnfdQWMfDQamrdozJExHhQq~UqD5Xg5plNtmMewu7kebsOUZJIAVfyCYc7r~hnuS2M-SC-nqFKhbSfAvQ-BXwW2gTVYu5QQwmWM29t1wwbb9~ApaOtxMskGKusYYC0KvuAMWhxBeq~3H3I3es1eQFBBnTO0wmSlR~gP1Cxg7FrSmqtD-M0PMmOwUYSMiCg5KBPWL46YVnkp03IpAnGi1F2Y0eBiOkA8fqk3JeLB-0evdsyZg2Uq6NDZKuSfBI~qDRpvqQ__\u0026Key-Pair-Id=APKAJLOHF5GGSLRBV4ZA"}]}, dispatcherData: dispatcherData }); $(this).data('initialized', true); } }); $a.trackClickSource(".js-work-strip-work-link", "profile_work_strip") }); </script> <div class="js-work-strip profile--work_container" data-work-id="117822086"><div class="profile--work_thumbnail hidden-xs"><a class="js-work-strip-work-link" data-click-track="profile-work-strip-thumbnail" href="https://www.academia.edu/117822086/Decadal_diagenetic_effects_on_%CE%B4_sup_13_sup_C_and_%CE%B4_sup_15_sup_N_studied_in_varved_lake_sediment"><img alt="Research paper thumbnail of Decadal diagenetic effects on δ<sup>13</sup> C and δ<sup>15</sup> N studied in varved lake sediment" class="work-thumbnail" src="https://attachments.academia-assets.com/113586273/thumbnails/1.jpg" /></a></div><div class="wp-workCard wp-workCard_itemContainer"><div class="wp-workCard_item wp-workCard--title"><a class="js-work-strip-work-link text-gray-darker" data-click-track="profile-work-strip-title" href="https://www.academia.edu/117822086/Decadal_diagenetic_effects_on_%CE%B4_sup_13_sup_C_and_%CE%B4_sup_15_sup_N_studied_in_varved_lake_sediment">Decadal diagenetic effects on δ<sup>13</sup> C and δ<sup>15</sup> N studied in varved lake sediment</a></div><div class="wp-workCard_item"><span>Limnology and Oceanography</span><span>, May 1, 2009</span></div><div class="wp-workCard_item"><span class="js-work-more-abstract-truncated">To assess the long-term (27 yr) effects of sediment aging on stable carbon and nitrogen isotope v...</span><a class="js-work-more-abstract" data-broccoli-component="work_strip.more_abstract" data-click-track="profile-work-strip-more-abstract" href="javascript:;"><span> more </span><span><i class="fa fa-caret-down"></i></span></a><span class="js-work-more-abstract-untruncated hidden">To assess the long-term (27 yr) effects of sediment aging on stable carbon and nitrogen isotope values (d 13 C and d 15 N), we used a collection of eight freeze cores of annually laminated (varved) lake sediment collected from 1979 to 2007 in Nylandssjö n (northern Sweden). Previous research has shown that 20-23% of carbon and 35% of nitrogen is lost in 27 yr. Material from specific years was compared in the cores, e.g.</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><a id="3f91490c7c67efa7b859cea18f21a175" class="wp-workCard--action" rel="nofollow" data-click-track="profile-work-strip-download" data-download="{"attachment_id":113586273,"asset_id":117822086,"asset_type":"Work","button_location":"profile"}" href="https://www.academia.edu/attachments/113586273/download_file?s=profile"><span><i class="fa fa-arrow-down"></i></span><span>Download</span></a><span class="wp-workCard--action visible-if-viewed-by-owner inline-block" style="display: none;"><span class="js-profile-work-strip-edit-button-wrapper profile-work-strip-edit-button-wrapper" data-work-id="117822086"><a class="js-profile-work-strip-edit-button" tabindex="0"><span><i class="fa fa-pencil"></i></span><span>Edit</span></a></span></span></div><div class="wp-workCard_item wp-workCard--stats"><span><span><span class="js-view-count view-count u-mr2x" data-work-id="117822086"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 117822086; 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$(this).data('initialized', true); } }); $a.trackClickSource(".js-work-strip-work-link", "profile_work_strip") }); </script> <div class="js-work-strip profile--work_container" data-work-id="117822085"><div class="profile--work_thumbnail hidden-xs"><a class="js-work-strip-work-link" data-click-track="profile-work-strip-thumbnail" rel="nofollow" href="https://www.academia.edu/117822085/Effect_of_past_century_mining_activities_on_sediment_properties_and_toxicity_to_freshwater_organisms_in_northern_Sweden"><img alt="Research paper thumbnail of Effect of past century mining activities on sediment properties and toxicity to freshwater organisms in northern Sweden" class="work-thumbnail" src="https://a.academia-assets.com/images/blank-paper.jpg" /></a></div><div class="wp-workCard wp-workCard_itemContainer"><div class="wp-workCard_item wp-workCard--title"><a class="js-work-strip-work-link text-gray-darker" data-click-track="profile-work-strip-title" rel="nofollow" href="https://www.academia.edu/117822085/Effect_of_past_century_mining_activities_on_sediment_properties_and_toxicity_to_freshwater_organisms_in_northern_Sweden">Effect of past century mining activities on sediment properties and toxicity to freshwater organisms in northern Sweden</a></div><div class="wp-workCard_item"><span>Science of The Total Environment</span><span>, May 1, 2023</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><span class="wp-workCard--action visible-if-viewed-by-owner inline-block" style="display: none;"><span class="js-profile-work-strip-edit-button-wrapper profile-work-strip-edit-button-wrapper" data-work-id="117822085"><a class="js-profile-work-strip-edit-button" tabindex="0"><span><i class="fa fa-pencil"></i></span><span>Edit</span></a></span></span></div><div class="wp-workCard_item wp-workCard--stats"><span><span><span class="js-view-count view-count u-mr2x" data-work-id="117822085"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 117822085; 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</script> <div class="js-work-strip profile--work_container" data-work-id="117822084"><div class="profile--work_thumbnail hidden-xs"><a class="js-work-strip-work-link" data-click-track="profile-work-strip-thumbnail" rel="nofollow" href="https://www.academia.edu/117822084/Improved_understanding_of_Diatom_stratigraphy_in_a_varved_sediment_through_lake_monitoring_and_sediment_trap_data"><img alt="Research paper thumbnail of Improved understanding of Diatom stratigraphy in a varved sediment through lake monitoring and sediment trap data" class="work-thumbnail" src="https://a.academia-assets.com/images/blank-paper.jpg" /></a></div><div class="wp-workCard wp-workCard_itemContainer"><div class="wp-workCard_item wp-workCard--title"><a class="js-work-strip-work-link text-gray-darker" data-click-track="profile-work-strip-title" rel="nofollow" href="https://www.academia.edu/117822084/Improved_understanding_of_Diatom_stratigraphy_in_a_varved_sediment_through_lake_monitoring_and_sediment_trap_data">Improved understanding of Diatom stratigraphy in a varved sediment through lake monitoring and sediment trap data</a></div><div class="wp-workCard_item"><span>EGU General Assembly Conference Abstracts</span><span>, Apr 1, 2016</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><span class="wp-workCard--action visible-if-viewed-by-owner inline-block" style="display: none;"><span class="js-profile-work-strip-edit-button-wrapper profile-work-strip-edit-button-wrapper" data-work-id="117822084"><a class="js-profile-work-strip-edit-button" tabindex="0"><span><i class="fa fa-pencil"></i></span><span>Edit</span></a></span></span></div><div class="wp-workCard_item wp-workCard--stats"><span><span><span class="js-view-count view-count u-mr2x" data-work-id="117822084"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 117822084; 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</script> <div class="js-work-strip profile--work_container" data-work-id="117822083"><div class="profile--work_thumbnail hidden-xs"><a class="js-work-strip-work-link" data-click-track="profile-work-strip-thumbnail" href="https://www.academia.edu/117822083/Environmental_footprint_of_small_scale_historical_mining_and_metallurgy_in_the_Swedish_boreal_forest_landscape_The_Moshyttan_blast_furnace_as_microcosm"><img alt="Research paper thumbnail of Environmental footprint of small-scale, historical mining and metallurgy in the Swedish boreal forest landscape: The Moshyttan blast furnace as microcosm" class="work-thumbnail" src="https://attachments.academia-assets.com/113586227/thumbnails/1.jpg" /></a></div><div class="wp-workCard wp-workCard_itemContainer"><div class="wp-workCard_item wp-workCard--title"><a class="js-work-strip-work-link text-gray-darker" data-click-track="profile-work-strip-title" href="https://www.academia.edu/117822083/Environmental_footprint_of_small_scale_historical_mining_and_metallurgy_in_the_Swedish_boreal_forest_landscape_The_Moshyttan_blast_furnace_as_microcosm">Environmental footprint of small-scale, historical mining and metallurgy in the Swedish boreal forest landscape: The Moshyttan blast furnace as microcosm</a></div><div class="wp-workCard_item"><span>The Holocene</span><span>, Jan 31, 2019</span></div><div class="wp-workCard_item"><span class="js-work-more-abstract-truncated">The history of mining and smelting and the associated pollution have been documented using lake s...</span><a class="js-work-more-abstract" data-broccoli-component="work_strip.more_abstract" data-click-track="profile-work-strip-more-abstract" href="javascript:;"><span> more </span><span><i class="fa fa-caret-down"></i></span></a><span class="js-work-more-abstract-untruncated hidden">The history of mining and smelting and the associated pollution have been documented using lake sediments for decades, but the broader ecological implications are not well studied. We analyzed sediment profiles covering the past ~10,000 years from three lakes associated with an iron blast furnace in central Sweden, as an example of the many small-scale furnaces with historical roots in the medieval period. With a focus on long-term lake-water quality, we analyzed multiple proxies including geochemistry, pollen and charcoal, diatom composition and inferred pH, biogenic silica (bSi), visible near-infrared spectroscopy (VNIRS)-inferred lake-water total organic carbon (LW-TOC), and VNIRS-inferred sediment chlorophyll (sed-Chl). All three lakes had stable conditions during the middle Holocene (~5000 BCE to 1110 CE) typical of oligo-dystrophic lakes: pH 5.4-5.6, LW-TOC 15-18 mg L -1 . The most important diatom taxa include, for example, Aulacoseira scalaris, Brachysira neoexilis, and Frustulia saxonica. From ~1150 CE, decreases in LW-TOC, bSi, and sed-Chl in all three lakes coincide with a suite of proxies indicating disturbance associated with local, small-scale agriculture, and the more widespread use of the landscape in the past (e.g. forest grazing, charcoal production). Most important was a decline in LW-TOC by 30-50% in the three lakes prior to the 20th century. In addition, the one lake (Fickeln) downstream of the smelter and main areas of cultivation experienced a shift in diatom composition (mainly increasing Asterionella formosa) and a 0.6 pH increase coinciding with increasing cereal pollen and signs of blast furnace activity. The pH did not change in the other two lakes in response to disturbance; however, these lakes show a slight increase (0.3-0.5 pH units) because of modern liming. LW-TOC has returned to background levels in the downstream lake and remains lower in the other two.</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><a id="c256148c6afd166faf94f341a408ac9d" class="wp-workCard--action" rel="nofollow" data-click-track="profile-work-strip-download" data-download="{"attachment_id":113586227,"asset_id":117822083,"asset_type":"Work","button_location":"profile"}" href="https://www.academia.edu/attachments/113586227/download_file?s=profile"><span><i class="fa fa-arrow-down"></i></span><span>Download</span></a><span class="wp-workCard--action visible-if-viewed-by-owner inline-block" style="display: none;"><span class="js-profile-work-strip-edit-button-wrapper profile-work-strip-edit-button-wrapper" data-work-id="117822083"><a class="js-profile-work-strip-edit-button" tabindex="0"><span><i class="fa fa-pencil"></i></span><span>Edit</span></a></span></span></div><div class="wp-workCard_item wp-workCard--stats"><span><span><span class="js-view-count view-count u-mr2x" data-work-id="117822083"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 117822083; 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dispatcherData = { dispatcher: window.WowProfile.dispatcher, downloadLinkId: "c256148c6afd166faf94f341a408ac9d" } } $('.js-work-strip[data-work-id=117822083]').each(function() { if (!$(this).data('initialized')) { new WowProfile.WorkStripView({ el: this, workJSON: {"id":117822083,"title":"Environmental footprint of small-scale, historical mining and metallurgy in the Swedish boreal forest landscape: The Moshyttan blast furnace as microcosm","internal_url":"https://www.academia.edu/117822083/Environmental_footprint_of_small_scale_historical_mining_and_metallurgy_in_the_Swedish_boreal_forest_landscape_The_Moshyttan_blast_furnace_as_microcosm","owner_id":34310257,"coauthors_can_edit":true,"owner":{"id":34310257,"first_name":"Christian","middle_initials":null,"last_name":"Bigler","page_name":"ChristianBigler","domain_name":"independent","created_at":"2015-08-27T23:00:36.425-07:00","display_name":"Christian Bigler","url":"https://independent.academia.edu/ChristianBigler","email":"RlJwT0hWY0NiRytId3BEYmJxaWdKejVxam81c3BpY2xXY1p0V0xScTlySStuVzNBRlR1enhqN1Q2YWs5ZGZVRi0tV1hZeFZqc3RNZmh1NG1pbktKeHUzZz09--965c1d7f6916b9a2df8ef33274382eb402b41338"},"attachments":[{"id":113586227,"title":"","file_type":"pdf","scribd_thumbnail_url":"https://attachments.academia-assets.com/113586227/thumbnails/1.jpg","file_name":"095968361882474120240421-1-u2p55.pdf","download_url":"https://www.academia.edu/attachments/113586227/download_file","bulk_download_file_name":"Environmental_footprint_of_small_scale_h.pdf","bulk_download_url":"https://d1wqtxts1xzle7.cloudfront.net/113586227/095968361882474120240421-1-u2p55-libre.pdf?1713707121=\u0026response-content-disposition=attachment%3B+filename%3DEnvironmental_footprint_of_small_scale_h.pdf\u0026Expires=1740506989\u0026Signature=G-LqY0kVlUJIgDR2AVzmz3LUktS8-2r4H2bskc4uqjGwRU6K30ZzYXhEv5erpji-iaTZmh13-HiNUsEoj4UC3r5EPK1Oa0Z0Rxu-BuAzSuKtxMcSbQFry0dGzLiYD5hOX~GVE9oC7wtlDka~ALlTxbtc4JpovCJHVTQ~FoMR9uiSxeHb8tLclQxPM6Ss2G1kj0RzbOPRxHhPoYzpdm9iHMhXSieLyH~bkcB0bOdaHO0E1YCMCDyHfE3J6MQ9NftTDDY4ETuwh3Fy5vl0ZDv0TzqcSd~vlTpBtU2vtcxAPrSdP41cBCIZFH~lOgA7TSzg4o6f0rLFJ6~t5pfc-XRfig__\u0026Key-Pair-Id=APKAJLOHF5GGSLRBV4ZA"}]}, dispatcherData: dispatcherData }); $(this).data('initialized', true); } }); $a.trackClickSource(".js-work-strip-work-link", "profile_work_strip") }); </script> <div class="js-work-strip profile--work_container" data-work-id="117822082"><div class="profile--work_thumbnail hidden-xs"><a class="js-work-strip-work-link" data-click-track="profile-work-strip-thumbnail" href="https://www.academia.edu/117822082/Functional_clustering_of_varved_lake_sediment_to_reconstruct_past_seasonal_climate"><img alt="Research paper thumbnail of Functional clustering of varved lake sediment to reconstruct past seasonal climate" class="work-thumbnail" src="https://attachments.academia-assets.com/113586230/thumbnails/1.jpg" /></a></div><div class="wp-workCard wp-workCard_itemContainer"><div class="wp-workCard_item wp-workCard--title"><a class="js-work-strip-work-link text-gray-darker" data-click-track="profile-work-strip-title" href="https://www.academia.edu/117822082/Functional_clustering_of_varved_lake_sediment_to_reconstruct_past_seasonal_climate">Functional clustering of varved lake sediment to reconstruct past seasonal climate</a></div><div class="wp-workCard_item"><span>Environmental and Ecological Statistics</span><span>, Jul 19, 2016</span></div><div class="wp-workCard_item"><span class="js-work-more-abstract-truncated">Annually laminated (varved) lake sediments constitutes excellent environmental archives, and have...</span><a class="js-work-more-abstract" data-broccoli-component="work_strip.more_abstract" data-click-track="profile-work-strip-more-abstract" href="javascript:;"><span> more </span><span><i class="fa fa-caret-down"></i></span></a><span class="js-work-more-abstract-untruncated hidden">Annually laminated (varved) lake sediments constitutes excellent environmental archives, and have the potential to play an important role for understanding past seasonal climate with their inherent annual time resolution and within-year seasonal patterns. We propose to use functional data analysis methods to extract the relevant information with respect to climate reconstruction from the rich but complex information in the varves, including the shapes of the seasonal patterns, the varying varve thickness, and the non-linear sediment accumulation rates. In particular we analyze varved sediment from lake Kassjön in northern Sweden, covering the past 6400 years. The properties of each varve reflect to a large extent weather conditions and internal biological processes in the lake the year that the varve was deposited. Functional clustering is used to group the seasonal patterns into different types, that can be associated with different weather conditions. The seasonal patterns were described by penalized splines and clustered by the k-means algorithm, after alignment. The observed (within-year) variability in the data was used to determine the degree of smoothing for Handling Editor: Bryan F. J. Manly.</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><a id="61d611044eb395fff9d5ada04006abde" class="wp-workCard--action" rel="nofollow" data-click-track="profile-work-strip-download" data-download="{"attachment_id":113586230,"asset_id":117822082,"asset_type":"Work","button_location":"profile"}" href="https://www.academia.edu/attachments/113586230/download_file?s=profile"><span><i class="fa fa-arrow-down"></i></span><span>Download</span></a><span class="wp-workCard--action visible-if-viewed-by-owner inline-block" style="display: none;"><span class="js-profile-work-strip-edit-button-wrapper profile-work-strip-edit-button-wrapper" data-work-id="117822082"><a class="js-profile-work-strip-edit-button" tabindex="0"><span><i class="fa fa-pencil"></i></span><span>Edit</span></a></span></span></div><div class="wp-workCard_item wp-workCard--stats"><span><span><span class="js-view-count view-count u-mr2x" data-work-id="117822082"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 117822082; 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$(this).data('initialized', true); } }); $a.trackClickSource(".js-work-strip-work-link", "profile_work_strip") }); </script> <div class="js-work-strip profile--work_container" data-work-id="117822081"><div class="profile--work_thumbnail hidden-xs"><a class="js-work-strip-work-link" data-click-track="profile-work-strip-thumbnail" href="https://www.academia.edu/117822081/A_multi_proxy_palaeoecological_study_of_Alanen_Laanij%C3%A4rvi_a_boreal_forest_lake_in_Swedish_Lapland"><img alt="Research paper thumbnail of A multi-proxy palaeoecological study of Alanen Laanijärvi, a boreal-forest lake in Swedish Lapland" class="work-thumbnail" src="https://attachments.academia-assets.com/113586226/thumbnails/1.jpg" /></a></div><div class="wp-workCard wp-workCard_itemContainer"><div class="wp-workCard_item wp-workCard--title"><a class="js-work-strip-work-link text-gray-darker" data-click-track="profile-work-strip-title" href="https://www.academia.edu/117822081/A_multi_proxy_palaeoecological_study_of_Alanen_Laanij%C3%A4rvi_a_boreal_forest_lake_in_Swedish_Lapland">A multi-proxy palaeoecological study of Alanen Laanijärvi, a boreal-forest lake in Swedish Lapland</a></div><div class="wp-workCard_item"><span>Boreas</span><span>, Jun 28, 2008</span></div><div class="wp-workCard_item"><span class="js-work-more-abstract-truncated">Chironomids, pollen and spores were used to reconstruct Holocene aquatic and terrestrial environm...</span><a class="js-work-more-abstract" data-broccoli-component="work_strip.more_abstract" data-click-track="profile-work-strip-more-abstract" href="javascript:;"><span> more </span><span><i class="fa fa-caret-down"></i></span></a><span class="js-work-more-abstract-untruncated hidden">Chironomids, pollen and spores were used to reconstruct Holocene aquatic and terrestrial environments at Alanen Laanijärvi, northern Sweden. Chironomid analysis revealed a pattern of limnological evolution from oligotrophic conditions in a relatively deep lake during 8.6 to 5.5 cal. ka BP, followed by a period of lake shallowing from 5.5 to 2.7 cal. ka BP. Increases in acidity and littoral habitat complexity may have occurred from 2.7 cal. ka BP to the present, though some compositional changes may have resulted from human disturbance. Chironomid-inferred mean July air temperatures range between 9.8 C in the Early Holocene to 11.3 C in the Late Holocene. Limitations on chironomid-based quantitative temperature interpretations may exist because of low taxon richness. Diatoms were recovered from the upper sediments only, from about AD 1800. Pollen and spore analysis revealed an early colonizing vegetation of juniper, sedges and birch soon after local deglaciation, followed by birch forests until about 8.3 cal. ka BP. Alder stands occurred locally to 5.5 cal. ka BP, when pine and spruce forests developed and remain to the present day. These results suggest that little major terrestrial vegetation change may occur in some northern environments with predicted future global warming, where it is predicted to be most severe. Aquatic environments may, however, be greatly affected by a shift in precipitation regime, causing changes in allochthonous organic input, lake depth and possibly the amount of human activity or disturbance in the watershed.</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><a id="16be3183dc5259e941669a09a41b8221" class="wp-workCard--action" rel="nofollow" data-click-track="profile-work-strip-download" data-download="{"attachment_id":113586226,"asset_id":117822081,"asset_type":"Work","button_location":"profile"}" href="https://www.academia.edu/attachments/113586226/download_file?s=profile"><span><i class="fa fa-arrow-down"></i></span><span>Download</span></a><span class="wp-workCard--action visible-if-viewed-by-owner inline-block" style="display: none;"><span class="js-profile-work-strip-edit-button-wrapper profile-work-strip-edit-button-wrapper" data-work-id="117822081"><a class="js-profile-work-strip-edit-button" tabindex="0"><span><i class="fa fa-pencil"></i></span><span>Edit</span></a></span></span></div><div class="wp-workCard_item wp-workCard--stats"><span><span><span class="js-view-count view-count u-mr2x" data-work-id="117822081"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 117822081; 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$(this).data('initialized', true); } }); $a.trackClickSource(".js-work-strip-work-link", "profile_work_strip") }); </script> <div class="js-work-strip profile--work_container" data-work-id="117822080"><div class="profile--work_thumbnail hidden-xs"><a class="js-work-strip-work-link" data-click-track="profile-work-strip-thumbnail" href="https://www.academia.edu/117822080/Numerical_simulations_suggest_that_counting_sums_and_taxonomic_resolution_of_diatom_analyses_to_determine_IPS_pollution_and_ACID_acidity_indices_can_be_reduced"><img alt="Research paper thumbnail of Numerical simulations suggest that counting sums and taxonomic resolution of diatom analyses to determine IPS pollution and ACID acidity indices can be reduced" class="work-thumbnail" src="https://attachments.academia-assets.com/113586228/thumbnails/1.jpg" /></a></div><div class="wp-workCard wp-workCard_itemContainer"><div class="wp-workCard_item wp-workCard--title"><a class="js-work-strip-work-link text-gray-darker" data-click-track="profile-work-strip-title" href="https://www.academia.edu/117822080/Numerical_simulations_suggest_that_counting_sums_and_taxonomic_resolution_of_diatom_analyses_to_determine_IPS_pollution_and_ACID_acidity_indices_can_be_reduced">Numerical simulations suggest that counting sums and taxonomic resolution of diatom analyses to determine IPS pollution and ACID acidity indices can be reduced</a></div><div class="wp-workCard_item"><span>Journal of Applied Phycology</span><span>, Dec 4, 2009</span></div><div class="wp-workCard_item"><span class="js-work-more-abstract-truncated">Implementation of the European Union Water Framework Directive and associated national guidelines...</span><a class="js-work-more-abstract" data-broccoli-component="work_strip.more_abstract" data-click-track="profile-work-strip-more-abstract" href="javascript:;"><span> more </span><span><i class="fa fa-caret-down"></i></span></a><span class="js-work-more-abstract-untruncated hidden">Implementation of the European Union Water Framework Directive and associated national guidelines has emphasized the value of using biota, such as epilithic diatoms in streams, as indicators of water quality. However, guidelines for evaluating diatom samples have been established without explicitly evaluating their statistical robustness. We used epilithic diatom samples from 73 streams in northern Sweden and simulated the effects of variations in the counting sum size and taxonomic resolution of classifications for two indices indicating pollution (Indice de Polluo-sensibilité Spécifique, IPS) and acidity (acidity index for diatoms, ACID). Instead of the stipulated 400, we found that a count sum of 40 diatom valves for 50 streams, and 80 valves for 60 streams, would have been sufficient to obtain the same IPS index classification. The ACID index is more sensitive to count sum reductions, since the same classification would only have been obtained for 12 streams with 40 counted diatom valves or 24 streams with a count of 80 valves. Excluding rare taxa had negligible effects on the IPS and ACID indices. Excluding taxa occurring with less than 1.0% frequency affected the IPS classification of only one stream, and excluding taxa with less than 2.5% and 5.0% frequencies affected those of just one and no streams, respectively. The ACID index was affected for none, five, and 12 streams, respectively. At least in relatively unpolluted regions such as northern Sweden, our simulations suggest that a simplified methodological approach with site-specific counting sum sizes and reduced taxonomical resolution could be adopted, taking into account the way sites are classified in relation to established class boundaries. The simplified method is a step forward in improving the cost efficiency for stream monitoring, as costs of diatom analysis to obtain identical IPS and ACID classifications of our streams could be reduced considerably. Before the simplified method can be widely adopted, further simulations including regions with a higher proportion of polluted streams are required.</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><a id="724b7727f43bce615d55b1fa0e7f61d3" class="wp-workCard--action" rel="nofollow" data-click-track="profile-work-strip-download" data-download="{"attachment_id":113586228,"asset_id":117822080,"asset_type":"Work","button_location":"profile"}" href="https://www.academia.edu/attachments/113586228/download_file?s=profile"><span><i class="fa fa-arrow-down"></i></span><span>Download</span></a><span class="wp-workCard--action visible-if-viewed-by-owner inline-block" style="display: none;"><span class="js-profile-work-strip-edit-button-wrapper profile-work-strip-edit-button-wrapper" data-work-id="117822080"><a class="js-profile-work-strip-edit-button" tabindex="0"><span><i class="fa fa-pencil"></i></span><span>Edit</span></a></span></span></div><div class="wp-workCard_item wp-workCard--stats"><span><span><span class="js-view-count view-count u-mr2x" data-work-id="117822080"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 117822080; 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</script> <div class="js-work-strip profile--work_container" data-work-id="117822075"><div class="profile--work_thumbnail hidden-xs"><a class="js-work-strip-work-link" data-click-track="profile-work-strip-thumbnail" rel="nofollow" href="https://www.academia.edu/117822075/Organic_Carbon_Dynamics_beyond_the_Perspective_of_Monitoring_Impact_of_Historical_Landscape_Utilization_on_the_Past_Lake_Water_Carbon_Trajectory_in_Central_Boreal_Sweden"><img alt="Research paper thumbnail of Organic Carbon Dynamics beyond the Perspective of Monitoring: Impact of Historical Landscape Utilization on the Past Lake-Water Carbon Trajectory in Central Boreal Sweden" class="work-thumbnail" src="https://a.academia-assets.com/images/blank-paper.jpg" /></a></div><div class="wp-workCard wp-workCard_itemContainer"><div class="wp-workCard_item wp-workCard--title"><a class="js-work-strip-work-link text-gray-darker" data-click-track="profile-work-strip-title" rel="nofollow" href="https://www.academia.edu/117822075/Organic_Carbon_Dynamics_beyond_the_Perspective_of_Monitoring_Impact_of_Historical_Landscape_Utilization_on_the_Past_Lake_Water_Carbon_Trajectory_in_Central_Boreal_Sweden">Organic Carbon Dynamics beyond the Perspective of Monitoring: Impact of Historical Landscape Utilization on the Past Lake-Water Carbon Trajectory in Central Boreal Sweden</a></div><div class="wp-workCard_item"><span>2014 AGU Fall Meeting</span><span>, Dec 19, 2014</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><span class="wp-workCard--action visible-if-viewed-by-owner inline-block" style="display: none;"><span class="js-profile-work-strip-edit-button-wrapper profile-work-strip-edit-button-wrapper" data-work-id="117822075"><a class="js-profile-work-strip-edit-button" tabindex="0"><span><i class="fa fa-pencil"></i></span><span>Edit</span></a></span></span></div><div class="wp-workCard_item wp-workCard--stats"><span><span><span class="js-view-count view-count u-mr2x" data-work-id="117822075"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 117822075; window.Academia.workViewCountsFetcher.queue(workId, function (count) { var description = window.$h.commaizeInt(count) + " " + window.$h.pluralize(count, 'View'); $(".js-view-count[data-work-id=117822075]").text(description); $(".js-view-count[data-work-id=117822075]").attr('title', description).tooltip(); }); });</script></span></span><span><span class="percentile-widget hidden"><span class="u-mr2x work-percentile"></span></span><script>$(function () { var workId = 117822075; window.Academia.workPercentilesFetcher.queue(workId, function (percentileText) { var container = $(".js-work-strip[data-work-id='117822075']"); container.find('.work-percentile').text(percentileText.charAt(0).toUpperCase() + percentileText.slice(1)); container.find('.percentile-widget').show(); container.find('.percentile-widget').removeClass('hidden'); }); });</script></span></div><div id="work-strip-premium-row-container"></div></div></div><script> require.config({ waitSeconds: 90 })(["https://a.academia-assets.com/assets/wow_profile-a9bf3a2bc8c89fa2a77156577594264ee8a0f214d74241bc0fcd3f69f8d107ac.js","https://a.academia-assets.com/assets/work_edit-ad038b8c047c1a8d4fa01b402d530ff93c45fee2137a149a4a5398bc8ad67560.js"], function() { // from javascript_helper.rb var dispatcherData = {} if (false){ window.WowProfile.dispatcher = window.WowProfile.dispatcher || _.clone(Backbone.Events); dispatcherData = { dispatcher: window.WowProfile.dispatcher, downloadLinkId: "-1" } } $('.js-work-strip[data-work-id=117822075]').each(function() { if (!$(this).data('initialized')) { new WowProfile.WorkStripView({ el: this, workJSON: {"id":117822075,"title":"Organic Carbon Dynamics beyond the Perspective of Monitoring: Impact of Historical Landscape Utilization on the Past Lake-Water Carbon Trajectory in Central Boreal Sweden","internal_url":"https://www.academia.edu/117822075/Organic_Carbon_Dynamics_beyond_the_Perspective_of_Monitoring_Impact_of_Historical_Landscape_Utilization_on_the_Past_Lake_Water_Carbon_Trajectory_in_Central_Boreal_Sweden","owner_id":34310257,"coauthors_can_edit":true,"owner":{"id":34310257,"first_name":"Christian","middle_initials":null,"last_name":"Bigler","page_name":"ChristianBigler","domain_name":"independent","created_at":"2015-08-27T23:00:36.425-07:00","display_name":"Christian Bigler","url":"https://independent.academia.edu/ChristianBigler","email":"cC9XcWREOVBQNk1jblpjTXBzYjlVM3N4d1JjWEJVVUUyNlNhdWFZWS9zaGZyQmdZbXkvenBIdUFNSk9BT1Z1OS0tOEI5Rk41VXNYWDVpQTMvQWp0UTdNQT09--44b95edce9cfd06a8a05942dca0350998b674c01"},"attachments":[]}, dispatcherData: dispatcherData }); $(this).data('initialized', true); } }); $a.trackClickSource(".js-work-strip-work-link", "profile_work_strip") }); </script> <div class="js-work-strip profile--work_container" data-work-id="117822074"><div class="profile--work_thumbnail hidden-xs"><a class="js-work-strip-work-link" data-click-track="profile-work-strip-thumbnail" rel="nofollow" href="https://www.academia.edu/117822074/Spatial_manifestation_of_the_Little_Ice_Age_in_Alaska"><img alt="Research paper thumbnail of Spatial manifestation of the Little Ice Age in Alaska" class="work-thumbnail" src="https://a.academia-assets.com/images/blank-paper.jpg" /></a></div><div class="wp-workCard wp-workCard_itemContainer"><div class="wp-workCard_item wp-workCard--title"><a class="js-work-strip-work-link text-gray-darker" data-click-track="profile-work-strip-title" rel="nofollow" href="https://www.academia.edu/117822074/Spatial_manifestation_of_the_Little_Ice_Age_in_Alaska">Spatial manifestation of the Little Ice Age in Alaska</a></div><div class="wp-workCard_item"><span>AGU Fall Meeting Abstracts</span><span>, Dec 1, 2005</span></div><div class="wp-workCard_item"><span class="js-work-more-abstract-truncated">We present here climate reconstructions of the past 1000 years on the basis of multiproxy sedimen...</span><a class="js-work-more-abstract" data-broccoli-component="work_strip.more_abstract" data-click-track="profile-work-strip-more-abstract" href="javascript:;"><span> more </span><span><i class="fa fa-caret-down"></i></span></a><span class="js-work-more-abstract-untruncated hidden">We present here climate reconstructions of the past 1000 years on the basis of multiproxy sediment analyses at six lakes in three regions of Alaska: the northwestern Alaskan Range (Farewell Lake), the southern Brooks Range (Takahula, Malamute, and Omega Lakes), and the Copper River Basin in southeastern Alaska (Grizzly and Moose Lakes). All three regions show a consistent decline in</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><span class="wp-workCard--action visible-if-viewed-by-owner inline-block" style="display: none;"><span class="js-profile-work-strip-edit-button-wrapper profile-work-strip-edit-button-wrapper" data-work-id="117822074"><a class="js-profile-work-strip-edit-button" tabindex="0"><span><i class="fa fa-pencil"></i></span><span>Edit</span></a></span></span></div><div class="wp-workCard_item wp-workCard--stats"><span><span><span class="js-view-count view-count u-mr2x" data-work-id="117822074"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 117822074; window.Academia.workViewCountsFetcher.queue(workId, function (count) { var description = window.$h.commaizeInt(count) + " " + window.$h.pluralize(count, 'View'); $(".js-view-count[data-work-id=117822074]").text(description); $(".js-view-count[data-work-id=117822074]").attr('title', description).tooltip(); }); });</script></span></span><span><span class="percentile-widget hidden"><span class="u-mr2x work-percentile"></span></span><script>$(function () { var workId = 117822074; window.Academia.workPercentilesFetcher.queue(workId, function (percentileText) { var container = $(".js-work-strip[data-work-id='117822074']"); container.find('.work-percentile').text(percentileText.charAt(0).toUpperCase() + percentileText.slice(1)); container.find('.percentile-widget').show(); container.find('.percentile-widget').removeClass('hidden'); }); });</script></span></div><div id="work-strip-premium-row-container"></div></div></div><script> require.config({ waitSeconds: 90 })(["https://a.academia-assets.com/assets/wow_profile-a9bf3a2bc8c89fa2a77156577594264ee8a0f214d74241bc0fcd3f69f8d107ac.js","https://a.academia-assets.com/assets/work_edit-ad038b8c047c1a8d4fa01b402d530ff93c45fee2137a149a4a5398bc8ad67560.js"], function() { // from javascript_helper.rb var dispatcherData = {} if (false){ window.WowProfile.dispatcher = window.WowProfile.dispatcher || _.clone(Backbone.Events); dispatcherData = { dispatcher: window.WowProfile.dispatcher, downloadLinkId: "-1" } } $('.js-work-strip[data-work-id=117822074]').each(function() { if (!$(this).data('initialized')) { new WowProfile.WorkStripView({ el: this, workJSON: {"id":117822074,"title":"Spatial manifestation of the Little Ice Age in Alaska","internal_url":"https://www.academia.edu/117822074/Spatial_manifestation_of_the_Little_Ice_Age_in_Alaska","owner_id":34310257,"coauthors_can_edit":true,"owner":{"id":34310257,"first_name":"Christian","middle_initials":null,"last_name":"Bigler","page_name":"ChristianBigler","domain_name":"independent","created_at":"2015-08-27T23:00:36.425-07:00","display_name":"Christian Bigler","url":"https://independent.academia.edu/ChristianBigler"},"attachments":[]}, dispatcherData: dispatcherData }); $(this).data('initialized', true); } }); $a.trackClickSource(".js-work-strip-work-link", "profile_work_strip") }); </script> <div class="js-work-strip profile--work_container" data-work-id="117822073"><div class="profile--work_thumbnail hidden-xs"><a class="js-work-strip-work-link" data-click-track="profile-work-strip-thumbnail" href="https://www.academia.edu/117822073/Regional_Holocene_climate_and_landscape_changes_recorded_in_the_large_subarctic_lake_Tornetr%C3%A4sk_N_Fennoscandia"><img alt="Research paper thumbnail of Regional Holocene climate and landscape changes recorded in the large subarctic lake Torneträsk, N Fennoscandia" class="work-thumbnail" src="https://attachments.academia-assets.com/113586206/thumbnails/1.jpg" /></a></div><div class="wp-workCard wp-workCard_itemContainer"><div class="wp-workCard_item wp-workCard--title"><a class="js-work-strip-work-link text-gray-darker" data-click-track="profile-work-strip-title" href="https://www.academia.edu/117822073/Regional_Holocene_climate_and_landscape_changes_recorded_in_the_large_subarctic_lake_Tornetr%C3%A4sk_N_Fennoscandia">Regional Holocene climate and landscape changes recorded in the large subarctic lake Torneträsk, N Fennoscandia</a></div><div class="wp-workCard_item"><span>Palaeogeography, Palaeoclimatology, Palaeoecology</span><span>, Dec 1, 2017</span></div><div class="wp-workCard_item"><span class="js-work-more-abstract-truncated">Understanding the response of sensitive Arctic and subarctic landscapes to climate change is esse...</span><a class="js-work-more-abstract" data-broccoli-component="work_strip.more_abstract" data-click-track="profile-work-strip-more-abstract" href="javascript:;"><span> more </span><span><i class="fa fa-caret-down"></i></span></a><span class="js-work-more-abstract-untruncated hidden">Understanding the response of sensitive Arctic and subarctic landscapes to climate change is essential to determine the risks of ongoing and projected climate warming. However, these responses will not be uniform in terms of timing and magnitude across the landscape because of site-specific differences in ecosystem susceptibility to climate forcing. Here we present a multiproxy analysis of a sediment record from the 330-km 2 lake Torneträsk to assess the sensitivity of the Fennoscandian subarctic landscape to climate change over the past ~9500 years. By comparing responses of this large-lake system to past climatic and environmental changes with those in small lakes in its catchment, we assessed when the magnitude of change was sufficient to affect an entire region rather than only specific sub-catchments that may be more sensitive to localized environmental changes such as, e.g., tree-line dynamics. Our results show three periods of regional landscape alteration with distinct change in sediment composition: i) landscape development following deglaciation and through the Holocene Thermal Maximum, ~9500-3400 cal yr BP; ii) increased soil erosion during the Little Ice Age (LIA); and iii) rapid change during the past century coincident with ongoing climate change. The gradual landscape development led to successive changes in the lake sediment composition over several millennia, whereas climate cooling during the late Holocene caused a rather abrupt shift occurring within ~100 years. However, this shift at the onset of the LIA (~750 cal yr BP) occurred >2000 years later than the first indications for climate cooling recorded in small lakes in the Torneträsk catchment, suggesting that a critical ecosystem threshold was not crossed until the LIA. In contrast, the ongoing response to recent climate change was immediate, emphasizing the unprecedented scale of ongoing climate changes in subarctic Fennoscandia.</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><a id="7ce6fae019fc3cbe2950e73f18b7d0aa" class="wp-workCard--action" rel="nofollow" data-click-track="profile-work-strip-download" data-download="{"attachment_id":113586206,"asset_id":117822073,"asset_type":"Work","button_location":"profile"}" href="https://www.academia.edu/attachments/113586206/download_file?s=profile"><span><i class="fa fa-arrow-down"></i></span><span>Download</span></a><span class="wp-workCard--action visible-if-viewed-by-owner inline-block" style="display: none;"><span class="js-profile-work-strip-edit-button-wrapper profile-work-strip-edit-button-wrapper" data-work-id="117822073"><a class="js-profile-work-strip-edit-button" tabindex="0"><span><i class="fa fa-pencil"></i></span><span>Edit</span></a></span></span></div><div class="wp-workCard_item wp-workCard--stats"><span><span><span class="js-view-count view-count u-mr2x" data-work-id="117822073"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 117822073; window.Academia.workViewCountsFetcher.queue(workId, function (count) { var description = window.$h.commaizeInt(count) + " " + window.$h.pluralize(count, 'View'); $(".js-view-count[data-work-id=117822073]").text(description); $(".js-view-count[data-work-id=117822073]").attr('title', description).tooltip(); }); });</script></span></span><span><span class="percentile-widget hidden"><span class="u-mr2x work-percentile"></span></span><script>$(function () { var workId = 117822073; window.Academia.workPercentilesFetcher.queue(workId, function (percentileText) { var container = $(".js-work-strip[data-work-id='117822073']"); container.find('.work-percentile').text(percentileText.charAt(0).toUpperCase() + percentileText.slice(1)); container.find('.percentile-widget').show(); container.find('.percentile-widget').removeClass('hidden'); }); });</script></span></div><div id="work-strip-premium-row-container"></div></div></div><script> require.config({ waitSeconds: 90 })(["https://a.academia-assets.com/assets/wow_profile-a9bf3a2bc8c89fa2a77156577594264ee8a0f214d74241bc0fcd3f69f8d107ac.js","https://a.academia-assets.com/assets/work_edit-ad038b8c047c1a8d4fa01b402d530ff93c45fee2137a149a4a5398bc8ad67560.js"], function() { // from javascript_helper.rb var dispatcherData = {} if (true){ window.WowProfile.dispatcher = window.WowProfile.dispatcher || _.clone(Backbone.Events); dispatcherData = { dispatcher: window.WowProfile.dispatcher, downloadLinkId: "7ce6fae019fc3cbe2950e73f18b7d0aa" } } $('.js-work-strip[data-work-id=117822073]').each(function() { if (!$(this).data('initialized')) { new WowProfile.WorkStripView({ el: this, workJSON: {"id":117822073,"title":"Regional Holocene climate and landscape changes recorded in the large subarctic lake Torneträsk, N Fennoscandia","internal_url":"https://www.academia.edu/117822073/Regional_Holocene_climate_and_landscape_changes_recorded_in_the_large_subarctic_lake_Tornetr%C3%A4sk_N_Fennoscandia","owner_id":34310257,"coauthors_can_edit":true,"owner":{"id":34310257,"first_name":"Christian","middle_initials":null,"last_name":"Bigler","page_name":"ChristianBigler","domain_name":"independent","created_at":"2015-08-27T23:00:36.425-07:00","display_name":"Christian Bigler","url":"https://independent.academia.edu/ChristianBigler","email":"WmVSY2xqajFwdStUNzRObHZTSHZiRU1UVmRSbXJocUc3dlpuUGpCMUdrSTNCYjNtVU13TUljOGFTS2NpMjRlMS0tNXZjQ3FhcGNkUkFRNHNkd3RyZGhrUT09--8ef9ed2306e8da4c34aced73240a95daa66d8ab8"},"attachments":[{"id":113586206,"title":"","file_type":"pdf","scribd_thumbnail_url":"https://attachments.academia-assets.com/113586206/thumbnails/1.jpg","file_name":"Meyer-Jacob_et_al._2017_Tornetr_C3_A4sk_accepted_manuscript.pdf","download_url":"https://www.academia.edu/attachments/113586206/download_file","bulk_download_file_name":"Regional_Holocene_climate_and_landscape.pdf","bulk_download_url":"https://d1wqtxts1xzle7.cloudfront.net/113586206/Meyer-Jacob_et_al._2017_Tornetr_C3_A4sk_accepted_manuscript-libre.pdf?1713707124=\u0026response-content-disposition=attachment%3B+filename%3DRegional_Holocene_climate_and_landscape.pdf\u0026Expires=1740506989\u0026Signature=WDjrKabEJ~k7yZe-9UYQbpiGgBNWCooF8ky8bO6AAr5XTNVujTkFSapqQ0mE09CmkgruSlDOND8ltP-cIKa~C7We0Wqmc32Bjo6zm4OaFE6ZiilMuCUOIBoDwfRLTEMHKH2WMlOaFeCGgbHlAXjm7maLewH5e3GExWjLyoy2ey5Bp~aSWwc0ldd16vT3t-f7eq5IJAA2x2tWDdUIHBcWOUuXZv8UtxzMNPAwMViJ600wsX4KmlVVXY-f1gNrLJE9Z9wa0LV8T33UpmQEn6Q4ggpYHWS2WG5R9uN-HKxAMHVXwuT4uzw5edAYA4wneF4zRwXvoYdbXwW7lzjoW2FCSQ__\u0026Key-Pair-Id=APKAJLOHF5GGSLRBV4ZA"},{"id":113586205,"title":"","file_type":"pdf","scribd_thumbnail_url":"https://attachments.academia-assets.com/113586205/thumbnails/1.jpg","file_name":"Meyer-Jacob_et_al._2017_Tornetr_C3_A4sk_accepted_manuscript.pdf","download_url":"https://www.academia.edu/attachments/113586205/download_file","bulk_download_file_name":"Regional_Holocene_climate_and_landscape.pdf","bulk_download_url":"https://d1wqtxts1xzle7.cloudfront.net/113586205/Meyer-Jacob_et_al._2017_Tornetr_C3_A4sk_accepted_manuscript-libre.pdf?1713707125=\u0026response-content-disposition=attachment%3B+filename%3DRegional_Holocene_climate_and_landscape.pdf\u0026Expires=1740506989\u0026Signature=MCok7e18TMZ5V2pR3ngPne~QYxoXL3LqFg7TTRhz0CT~l1EpinXA-P-c4ILmsydQg4pTg3nuW5qe9ah0F3IDyzlkE9PX~PmpxS8Y1BKzX66Uw-fNqKBnNjliVdrREPXTYGaEO1vSotC02I8cXPPUMF~xOJHfysp6yG0KByN~x7tu52IqQOYIzCyJFlj7~~6Q5HbFGNDn7j3kwVbrqgI8zydGqZoAQcAW~g3uIwY2yQWKA8yXnuPMab8UsY5eMX6i4r3Z1JTv~ah9t8c2Ss7yMctSu-9qYEeYpHk5LW1VfyZk0TUeK1lF5vnbk3jlP4twhbVU93hBiFDiZR0QiT2SXw__\u0026Key-Pair-Id=APKAJLOHF5GGSLRBV4ZA"}]}, dispatcherData: dispatcherData }); $(this).data('initialized', true); } }); $a.trackClickSource(".js-work-strip-work-link", "profile_work_strip") }); </script> <div class="js-work-strip profile--work_container" data-work-id="117822072"><div class="profile--work_thumbnail hidden-xs"><a class="js-work-strip-work-link" data-click-track="profile-work-strip-thumbnail" rel="nofollow" href="https://www.academia.edu/117822072/Near_Infrared_Spectroscopy_NIRS_of_Epilithic_Material_in_Streams_has_a_Potential_for_Monitoring_Impact_from_Mining"><img alt="Research paper thumbnail of Near-Infrared Spectroscopy (NIRS) of Epilithic Material in Streams has a Potential for Monitoring Impact from Mining" class="work-thumbnail" src="https://a.academia-assets.com/images/blank-paper.jpg" /></a></div><div class="wp-workCard wp-workCard_itemContainer"><div class="wp-workCard_item wp-workCard--title"><a class="js-work-strip-work-link text-gray-darker" data-click-track="profile-work-strip-title" rel="nofollow" href="https://www.academia.edu/117822072/Near_Infrared_Spectroscopy_NIRS_of_Epilithic_Material_in_Streams_has_a_Potential_for_Monitoring_Impact_from_Mining">Near-Infrared Spectroscopy (NIRS) of Epilithic Material in Streams has a Potential for Monitoring Impact from Mining</a></div><div class="wp-workCard_item"><span>Environmental Science & Technology</span><span>, Mar 17, 2007</span></div><div class="wp-workCard_item"><span class="js-work-more-abstract-truncated">There is an increasing demand for cost-effective methods for environmental monitoring, and here w...</span><a class="js-work-more-abstract" data-broccoli-component="work_strip.more_abstract" data-click-track="profile-work-strip-more-abstract" href="javascript:;"><span> more </span><span><i class="fa fa-caret-down"></i></span></a><span class="js-work-more-abstract-untruncated hidden">There is an increasing demand for cost-effective methods for environmental monitoring, and here we assess the potential of near-infrared spectroscopy (NIRS) on epilithic material from streams (material covering submerged stones) as a new method for monitoring the impact of pollution from mining and mining-related industries. NIRS, a routine technique in industry, registers the chemical properties of organic material on a molecular level and can detect minute alterations in the composition of epilithic material. Epilithic samples from 65 stream sites (42 uncontaminated and 23 contaminated) in northern Sweden were analyzed. The NIRS approach was evaluated by comparing it with the results of chemical analyses and diatom analyses of the same samples. Based on Principal Component Analysis, the NIRS data distinguished contaminated from uncontaminated sites and performed slightly betterthan chemical analyses and clearly betterthan diatom analyses. Of the streams designated a priori as contaminated, 74% were identified as contaminated by NIRS, 65% were identified by chemical analysis, and 26% were identified by diatom analysis. Unlike chemical analyses of water samples, NIRS data reflect biological impacts in the streams, and the epilithic material integrates impact over time. Given that, and the simplicity of NIRS-analyses, further studies to assess the use of NIRS of epilithic material as an inexpensive environmental monitoring method are justified.</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><span class="wp-workCard--action visible-if-viewed-by-owner inline-block" style="display: none;"><span class="js-profile-work-strip-edit-button-wrapper profile-work-strip-edit-button-wrapper" data-work-id="117822072"><a class="js-profile-work-strip-edit-button" tabindex="0"><span><i class="fa fa-pencil"></i></span><span>Edit</span></a></span></span></div><div class="wp-workCard_item wp-workCard--stats"><span><span><span class="js-view-count view-count u-mr2x" data-work-id="117822072"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 117822072; window.Academia.workViewCountsFetcher.queue(workId, function (count) { var description = window.$h.commaizeInt(count) + " " + window.$h.pluralize(count, 'View'); 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</script> <div class="js-work-strip profile--work_container" data-work-id="117822070"><div class="profile--work_thumbnail hidden-xs"><a class="js-work-strip-work-link" data-click-track="profile-work-strip-thumbnail" href="https://www.academia.edu/117822070/Similarities_and_discrepancies_between_chironomid_and_diatom_inferred_temperature_reconstructions_through_the_Holocene_at_Lake_850_northern_Sweden"><img alt="Research paper thumbnail of Similarities and discrepancies between chironomid- and diatom-inferred temperature reconstructions through the Holocene at Lake 850, northern Sweden" class="work-thumbnail" src="https://attachments.academia-assets.com/113586223/thumbnails/1.jpg" /></a></div><div class="wp-workCard wp-workCard_itemContainer"><div class="wp-workCard_item wp-workCard--title"><a class="js-work-strip-work-link text-gray-darker" data-click-track="profile-work-strip-title" href="https://www.academia.edu/117822070/Similarities_and_discrepancies_between_chironomid_and_diatom_inferred_temperature_reconstructions_through_the_Holocene_at_Lake_850_northern_Sweden">Similarities and discrepancies between chironomid- and diatom-inferred temperature reconstructions through the Holocene at Lake 850, northern Sweden</a></div><div class="wp-workCard_item"><span>Quaternary International</span><span>, 2004</span></div><div class="wp-workCard_item"><span class="js-work-more-abstract-truncated">A quantitative temperature reconstruction using chironomids and diatoms has been attempted from a...</span><a class="js-work-more-abstract" data-broccoli-component="work_strip.more_abstract" data-click-track="profile-work-strip-more-abstract" href="javascript:;"><span> more </span><span><i class="fa fa-caret-down"></i></span></a><span class="js-work-more-abstract-untruncated hidden">A quantitative temperature reconstruction using chironomids and diatoms has been attempted from a high elevation lake in northern Sweden (Lake 850). Since 7000 cal. years BP, both chironomids and diatoms recorded similar temperatures (in the range of present-day estimates) but the correspondence between chironomid and diatom-inferred temperatures was highest in the recent Holocene (2500 cal. years BP to the present). Between ca. 9000 and 7000 cal. years BP, inferred temperatures from chironomids were warmer than today (ca. 1-2 C), in accord with other climate reconstruction using pollen, plant macrofossils and oxygen isotope analysis in lakes of northern Scandinavia. In contrast, diatom analysis did not infer warmer temperatures during this period. The insensitivity of diatoms to temperature in Lake 850 between 9000 and 7000 cal. years BP could be attributed to other environmental factors affecting the diatom assemblages through time, especially lake-water pH. Diatom-inferred pH showed a gradual decrease (0.5 pH units) between 9000 and 7000 cal. years BP while it remained more or less constant since 7000 cal. years BP. Changes in lakewater pH acting on diatoms seem to mask the effect of climate, leading to temperature reconstructions that are inaccurate. Ways of disentangling climate and other environmental factors when attempting climate reconstruction should be further investigated.</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><a id="e05c11931b4b53488b6888b102c21c41" class="wp-workCard--action" rel="nofollow" data-click-track="profile-work-strip-download" data-download="{"attachment_id":113586223,"asset_id":117822070,"asset_type":"Work","button_location":"profile"}" href="https://www.academia.edu/attachments/113586223/download_file?s=profile"><span><i class="fa fa-arrow-down"></i></span><span>Download</span></a><span class="wp-workCard--action visible-if-viewed-by-owner inline-block" style="display: none;"><span class="js-profile-work-strip-edit-button-wrapper profile-work-strip-edit-button-wrapper" data-work-id="117822070"><a class="js-profile-work-strip-edit-button" tabindex="0"><span><i class="fa fa-pencil"></i></span><span>Edit</span></a></span></span></div><div class="wp-workCard_item wp-workCard--stats"><span><span><span class="js-view-count view-count u-mr2x" data-work-id="117822070"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 117822070; 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$(this).data('initialized', true); } }); $a.trackClickSource(".js-work-strip-work-link", "profile_work_strip") }); </script> <div class="js-work-strip profile--work_container" data-work-id="117822059"><div class="profile--work_thumbnail hidden-xs"><a class="js-work-strip-work-link" data-click-track="profile-work-strip-thumbnail" href="https://www.academia.edu/117822059/Late_Holocene_climate_variability_and_ecosystem_responses_in_Alaska_inferred_from_high_resolution_multiproxy_sediment_analyses_at_Grizzly_Lake"><img alt="Research paper thumbnail of Late-Holocene climate variability and ecosystem responses in Alaska inferred from high-resolution multiproxy sediment analyses at Grizzly Lake" class="work-thumbnail" src="https://attachments.academia-assets.com/113586207/thumbnails/1.jpg" /></a></div><div class="wp-workCard wp-workCard_itemContainer"><div class="wp-workCard_item wp-workCard--title"><a class="js-work-strip-work-link text-gray-darker" data-click-track="profile-work-strip-title" href="https://www.academia.edu/117822059/Late_Holocene_climate_variability_and_ecosystem_responses_in_Alaska_inferred_from_high_resolution_multiproxy_sediment_analyses_at_Grizzly_Lake">Late-Holocene climate variability and ecosystem responses in Alaska inferred from high-resolution multiproxy sediment analyses at Grizzly Lake</a></div><div class="wp-workCard_item"><span>Quaternary Science Reviews</span><span>, Oct 1, 2015</span></div><div class="wp-workCard_item"><span class="js-work-more-abstract-truncated">The late-Holocene shift from Picea glauca (white spruce) to Picea mariana (black spruce) forests ...</span><a class="js-work-more-abstract" data-broccoli-component="work_strip.more_abstract" data-click-track="profile-work-strip-more-abstract" href="javascript:;"><span> more </span><span><i class="fa fa-caret-down"></i></span></a><span class="js-work-more-abstract-untruncated hidden">The late-Holocene shift from Picea glauca (white spruce) to Picea mariana (black spruce) forests marked the establishment of modern boreal forests in Alaska. To understand the patterns and drivers of this vegetational change and the associated late-Holocene environmental dynamics, we analyzed radiocarbon-dated sediments from Grizzly Lake for chironomids, diatoms, pollen, macrofossils, charcoal, element composition, particle size, and magnetic properties for the period 4100e1800 cal BP. Chironomid assemblages reveal two episodes of decreased July temperature, at ca. 3300e3150 (ca À1 C) and 2900e2550 cal BP (ca À2 C). These episodes coincided with climate change elsewhere in the Northern Hemisphere, atmospheric reorganization, and low solar activity. Diatom-inferred lake levels dropped by ca. 5 m at 3200 cal BP, suggesting dry conditions during the period 3200e1800 cal BP. P. glauca declined and P. mariana expanded at ca. 3200 cal BP; this vegetational change was linked to diatom-inferred low lake levels and thus decreased moisture availability. Forest cover declined at 3300e3100, 2800e2500 and 2300e2100 cal BP and soil erosion as inferred from increased values of Al, K, Si, Ti, and Ca intensified, when solar irradiance was low. Plant taxa adapted to disturbance and cold climate (e.g. Alnus viridis, shrub Betula, Epilobium) expanded during these periods of reduced forest cover. This open vegetation type was associated with high fire activity that peaked at 2800 cal BP, when climatic conditions were particularly cold and dry. Forest recovery lagged behind subsequent climate warming (þ3 C) by ca. 75 e225 years. Our multiproxy data set suggests that P. glauca was dominant under warm-moist climatic conditions, whereas P. mariana prevailed under cold-dry and warm-dry conditions. This pattern implies that climatic warming, as anticipated for this century, may promote P. glauca expansions, if moisture availability will be sufficiently high, while P. mariana may expand under dry conditions, possibly exacerbating climate impacts on the fire regime.</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><a id="e1ec3e44203c72ad2306c6a78a9d53cf" class="wp-workCard--action" rel="nofollow" data-click-track="profile-work-strip-download" data-download="{"attachment_id":113586207,"asset_id":117822059,"asset_type":"Work","button_location":"profile"}" href="https://www.academia.edu/attachments/113586207/download_file?s=profile"><span><i class="fa fa-arrow-down"></i></span><span>Download</span></a><span class="wp-workCard--action visible-if-viewed-by-owner inline-block" style="display: none;"><span class="js-profile-work-strip-edit-button-wrapper profile-work-strip-edit-button-wrapper" data-work-id="117822059"><a class="js-profile-work-strip-edit-button" tabindex="0"><span><i class="fa fa-pencil"></i></span><span>Edit</span></a></span></span></div><div class="wp-workCard_item wp-workCard--stats"><span><span><span class="js-view-count view-count u-mr2x" data-work-id="117822059"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 117822059; 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$(this).data('initialized', true); } }); $a.trackClickSource(".js-work-strip-work-link", "profile_work_strip") }); </script> </div><div class="profile--tab_content_container js-tab-pane tab-pane" data-section-id="3449919" id="papers"><div class="js-work-strip profile--work_container" data-work-id="117822089"><div class="profile--work_thumbnail hidden-xs"><a class="js-work-strip-work-link" data-click-track="profile-work-strip-thumbnail" href="https://www.academia.edu/117822089/Composition_and_dispersal_of_riverine_and_lake_phytoplankton_communities_in_connected_systems_with_different_water_retention_times"><img alt="Research paper thumbnail of Composition and dispersal of riverine and lake phytoplankton communities in connected systems with different water retention times" class="work-thumbnail" src="https://attachments.academia-assets.com/113586229/thumbnails/1.jpg" /></a></div><div class="wp-workCard wp-workCard_itemContainer"><div class="wp-workCard_item wp-workCard--title"><a class="js-work-strip-work-link text-gray-darker" data-click-track="profile-work-strip-title" href="https://www.academia.edu/117822089/Composition_and_dispersal_of_riverine_and_lake_phytoplankton_communities_in_connected_systems_with_different_water_retention_times">Composition and dispersal of riverine and lake phytoplankton communities in connected systems with different water retention times</a></div><div class="wp-workCard_item"><span>Freshwater Biology</span><span>, Dec 1, 2008</span></div><div class="wp-workCard_item"><span class="js-work-more-abstract-truncated">1. Lake phytoplankton community structure may be influenced by both internal factors (predation, ...</span><a class="js-work-more-abstract" data-broccoli-component="work_strip.more_abstract" data-click-track="profile-work-strip-more-abstract" href="javascript:;"><span> more </span><span><i class="fa fa-caret-down"></i></span></a><span class="js-work-more-abstract-untruncated hidden">1. Lake phytoplankton community structure may be influenced by both internal factors (predation, competition, resource constraints) and external ones, such as dispersal of materials and cells between connected habitats. However, little is known about the importance of cell dispersal for phytoplankton community structure in lakes. 2. We investigated the abundance and dispersal of phytoplankton cells between connected rivers and lakes, and analysed whether similarities in phytoplankton community composition between rivers and lakes were primarily related to cell import rates or to characteristics of the local habitat. We focused on lakes along a gradient of theoretical water retention times (TWRT). Two data sets from Swedish lakes were used; a seasonal study of two connected boreal forest lakes, differing in TWRT, and a multi-lake study of 13 lakes with a continuous range of TWRTs. 3. Phytoplankton cells were transported and dispersed in all investigated rivers. In the seasonal study, cell import rates and similarities in phytoplankton community composition between the lake and its inlet(s) were much higher in the lake with a shorter TWRT. Phytoplankton community structure in different habitats was associated with total organic carbon (TOC). This indicates that local habitat characteristics may be important in determining lake phytoplankton community composition, even in the presence of substantial cell import. 4. The multi-lake study also showed a negative relationship between TWRT and similarities in phytoplankton community composition between inlets and lakes. Moreover, similarity in community structure was related to both cell import rates from inlet to lake and differences in habitat characteristics between inlet and lake. However, the variable most strongly correlated with community structure was TOC, indicating that species sorting rather than a mass effect was the most important mechanism underlying the correlation between community structure and retention time. 5. Overall, our data suggest that local habitat characteristics may play a key role in determining community similarity in this set of lakes covering a large range of habitat connectedness. Due to the strong co-variations between cell dispersal and TOC, it was hard to unequivocally disentangle the different mechanisms; hence, there is a need for further studies of the role of dispersal for phytoplankton community structures.</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><a id="1305291c8e0b93100d54599e95d107a4" class="wp-workCard--action" rel="nofollow" data-click-track="profile-work-strip-download" data-download="{"attachment_id":113586229,"asset_id":117822089,"asset_type":"Work","button_location":"profile"}" href="https://www.academia.edu/attachments/113586229/download_file?s=profile"><span><i class="fa fa-arrow-down"></i></span><span>Download</span></a><span class="wp-workCard--action visible-if-viewed-by-owner inline-block" style="display: none;"><span class="js-profile-work-strip-edit-button-wrapper profile-work-strip-edit-button-wrapper" data-work-id="117822089"><a class="js-profile-work-strip-edit-button" tabindex="0"><span><i class="fa fa-pencil"></i></span><span>Edit</span></a></span></span></div><div class="wp-workCard_item wp-workCard--stats"><span><span><span class="js-view-count view-count u-mr2x" data-work-id="117822089"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 117822089; 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$(this).data('initialized', true); } }); $a.trackClickSource(".js-work-strip-work-link", "profile_work_strip") }); </script> <div class="js-work-strip profile--work_container" data-work-id="117822088"><div class="profile--work_thumbnail hidden-xs"><a class="js-work-strip-work-link" data-click-track="profile-work-strip-thumbnail" href="https://www.academia.edu/117822088/Environmental_history_A_piece_in_the_puzzle_for_establishing_plans_for_environmental_management"><img alt="Research paper thumbnail of Environmental history: A piece in the puzzle for establishing plans for environmental management" class="work-thumbnail" src="https://attachments.academia-assets.com/113586232/thumbnails/1.jpg" /></a></div><div class="wp-workCard wp-workCard_itemContainer"><div class="wp-workCard_item wp-workCard--title"><a class="js-work-strip-work-link text-gray-darker" data-click-track="profile-work-strip-title" href="https://www.academia.edu/117822088/Environmental_history_A_piece_in_the_puzzle_for_establishing_plans_for_environmental_management">Environmental history: A piece in the puzzle for establishing plans for environmental management</a></div><div class="wp-workCard_item"><span>Journal of Environmental Management</span><span>, Jun 1, 2009</span></div><div class="wp-workCard_item"><span class="js-work-more-abstract-truncated">Establishment of plans for environmental planning and management requires that a number of natura...</span><a class="js-work-more-abstract" data-broccoli-component="work_strip.more_abstract" data-click-track="profile-work-strip-more-abstract" href="javascript:;"><span> more </span><span><i class="fa fa-caret-down"></i></span></a><span class="js-work-more-abstract-untruncated hidden">Establishment of plans for environmental planning and management requires that a number of natural and societal factors must be taken into consideration. Insights into the inherent dynamics of nature as well as the role that past human activities have played for establishing the current condition of the landscape and the natural environment in general are essential. Many natural and man-made changes occur over time scales of decades or centuries, and these are difficult to comprehend without a historical perspective. Such a perspective can be obtained using palaeoecological studies, i.e. by geochemical and biological analyses of lake sediment and peat deposits. To illustrate the long-term dynamics of nature and particularly the role of man, we present here five case studies from Sweden concerning pollution, lake acidification, lake eutrophication, biodiversity, and landscape dynamics and conservation-topics of broad interests-and discuss benefits of including a longer time perspective in environmental management.</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><a id="592f49d9e7ad8b2454ad8f809e974d99" class="wp-workCard--action" rel="nofollow" data-click-track="profile-work-strip-download" data-download="{"attachment_id":113586232,"asset_id":117822088,"asset_type":"Work","button_location":"profile"}" href="https://www.academia.edu/attachments/113586232/download_file?s=profile"><span><i class="fa fa-arrow-down"></i></span><span>Download</span></a><span class="wp-workCard--action visible-if-viewed-by-owner inline-block" style="display: none;"><span class="js-profile-work-strip-edit-button-wrapper profile-work-strip-edit-button-wrapper" data-work-id="117822088"><a class="js-profile-work-strip-edit-button" tabindex="0"><span><i class="fa fa-pencil"></i></span><span>Edit</span></a></span></span></div><div class="wp-workCard_item wp-workCard--stats"><span><span><span class="js-view-count view-count u-mr2x" data-work-id="117822088"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 117822088; 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$(this).data('initialized', true); } }); $a.trackClickSource(".js-work-strip-work-link", "profile_work_strip") }); </script> <div class="js-work-strip profile--work_container" data-work-id="117822087"><div class="profile--work_thumbnail hidden-xs"><a class="js-work-strip-work-link" data-click-track="profile-work-strip-thumbnail" href="https://www.academia.edu/117822087/Early_land_use_and_centennial_scale_changes_in_lake_water_organic_carbon_prior_to_contemporary_monitoring"><img alt="Research paper thumbnail of Early land use and centennial scale changes in lake-water organic carbon prior to contemporary monitoring" class="work-thumbnail" src="https://attachments.academia-assets.com/113586231/thumbnails/1.jpg" /></a></div><div class="wp-workCard wp-workCard_itemContainer"><div class="wp-workCard_item wp-workCard--title"><a class="js-work-strip-work-link text-gray-darker" data-click-track="profile-work-strip-title" href="https://www.academia.edu/117822087/Early_land_use_and_centennial_scale_changes_in_lake_water_organic_carbon_prior_to_contemporary_monitoring">Early land use and centennial scale changes in lake-water organic carbon prior to contemporary monitoring</a></div><div class="wp-workCard_item"><span>Proceedings of the National Academy of Sciences of the United States of America</span><span>, May 11, 2015</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><a id="eddf177da3010bf952717a4ed6bd2de8" class="wp-workCard--action" rel="nofollow" data-click-track="profile-work-strip-download" data-download="{"attachment_id":113586231,"asset_id":117822087,"asset_type":"Work","button_location":"profile"}" href="https://www.academia.edu/attachments/113586231/download_file?s=profile"><span><i class="fa fa-arrow-down"></i></span><span>Download</span></a><span class="wp-workCard--action visible-if-viewed-by-owner inline-block" style="display: none;"><span class="js-profile-work-strip-edit-button-wrapper profile-work-strip-edit-button-wrapper" data-work-id="117822087"><a class="js-profile-work-strip-edit-button" tabindex="0"><span><i class="fa fa-pencil"></i></span><span>Edit</span></a></span></span></div><div class="wp-workCard_item wp-workCard--stats"><span><span><span class="js-view-count view-count u-mr2x" data-work-id="117822087"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 117822087; 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$(this).data('initialized', true); } }); $a.trackClickSource(".js-work-strip-work-link", "profile_work_strip") }); </script> <div class="js-work-strip profile--work_container" data-work-id="117822086"><div class="profile--work_thumbnail hidden-xs"><a class="js-work-strip-work-link" data-click-track="profile-work-strip-thumbnail" href="https://www.academia.edu/117822086/Decadal_diagenetic_effects_on_%CE%B4_sup_13_sup_C_and_%CE%B4_sup_15_sup_N_studied_in_varved_lake_sediment"><img alt="Research paper thumbnail of Decadal diagenetic effects on δ<sup>13</sup> C and δ<sup>15</sup> N studied in varved lake sediment" class="work-thumbnail" src="https://attachments.academia-assets.com/113586273/thumbnails/1.jpg" /></a></div><div class="wp-workCard wp-workCard_itemContainer"><div class="wp-workCard_item wp-workCard--title"><a class="js-work-strip-work-link text-gray-darker" data-click-track="profile-work-strip-title" href="https://www.academia.edu/117822086/Decadal_diagenetic_effects_on_%CE%B4_sup_13_sup_C_and_%CE%B4_sup_15_sup_N_studied_in_varved_lake_sediment">Decadal diagenetic effects on δ<sup>13</sup> C and δ<sup>15</sup> N studied in varved lake sediment</a></div><div class="wp-workCard_item"><span>Limnology and Oceanography</span><span>, May 1, 2009</span></div><div class="wp-workCard_item"><span class="js-work-more-abstract-truncated">To assess the long-term (27 yr) effects of sediment aging on stable carbon and nitrogen isotope v...</span><a class="js-work-more-abstract" data-broccoli-component="work_strip.more_abstract" data-click-track="profile-work-strip-more-abstract" href="javascript:;"><span> more </span><span><i class="fa fa-caret-down"></i></span></a><span class="js-work-more-abstract-untruncated hidden">To assess the long-term (27 yr) effects of sediment aging on stable carbon and nitrogen isotope values (d 13 C and d 15 N), we used a collection of eight freeze cores of annually laminated (varved) lake sediment collected from 1979 to 2007 in Nylandssjö n (northern Sweden). Previous research has shown that 20-23% of carbon and 35% of nitrogen is lost in 27 yr. Material from specific years was compared in the cores, e.g.</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><a id="3f91490c7c67efa7b859cea18f21a175" class="wp-workCard--action" rel="nofollow" data-click-track="profile-work-strip-download" data-download="{"attachment_id":113586273,"asset_id":117822086,"asset_type":"Work","button_location":"profile"}" href="https://www.academia.edu/attachments/113586273/download_file?s=profile"><span><i class="fa fa-arrow-down"></i></span><span>Download</span></a><span class="wp-workCard--action visible-if-viewed-by-owner inline-block" style="display: none;"><span class="js-profile-work-strip-edit-button-wrapper profile-work-strip-edit-button-wrapper" data-work-id="117822086"><a class="js-profile-work-strip-edit-button" tabindex="0"><span><i class="fa fa-pencil"></i></span><span>Edit</span></a></span></span></div><div class="wp-workCard_item wp-workCard--stats"><span><span><span class="js-view-count view-count u-mr2x" data-work-id="117822086"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 117822086; 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$(this).data('initialized', true); } }); $a.trackClickSource(".js-work-strip-work-link", "profile_work_strip") }); </script> <div class="js-work-strip profile--work_container" data-work-id="117822085"><div class="profile--work_thumbnail hidden-xs"><a class="js-work-strip-work-link" data-click-track="profile-work-strip-thumbnail" rel="nofollow" href="https://www.academia.edu/117822085/Effect_of_past_century_mining_activities_on_sediment_properties_and_toxicity_to_freshwater_organisms_in_northern_Sweden"><img alt="Research paper thumbnail of Effect of past century mining activities on sediment properties and toxicity to freshwater organisms in northern Sweden" class="work-thumbnail" src="https://a.academia-assets.com/images/blank-paper.jpg" /></a></div><div class="wp-workCard wp-workCard_itemContainer"><div class="wp-workCard_item wp-workCard--title"><a class="js-work-strip-work-link text-gray-darker" data-click-track="profile-work-strip-title" rel="nofollow" href="https://www.academia.edu/117822085/Effect_of_past_century_mining_activities_on_sediment_properties_and_toxicity_to_freshwater_organisms_in_northern_Sweden">Effect of past century mining activities on sediment properties and toxicity to freshwater organisms in northern Sweden</a></div><div class="wp-workCard_item"><span>Science of The Total Environment</span><span>, May 1, 2023</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><span class="wp-workCard--action visible-if-viewed-by-owner inline-block" style="display: none;"><span class="js-profile-work-strip-edit-button-wrapper profile-work-strip-edit-button-wrapper" data-work-id="117822085"><a class="js-profile-work-strip-edit-button" tabindex="0"><span><i class="fa fa-pencil"></i></span><span>Edit</span></a></span></span></div><div class="wp-workCard_item wp-workCard--stats"><span><span><span class="js-view-count view-count u-mr2x" data-work-id="117822085"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 117822085; 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</script> <div class="js-work-strip profile--work_container" data-work-id="117822084"><div class="profile--work_thumbnail hidden-xs"><a class="js-work-strip-work-link" data-click-track="profile-work-strip-thumbnail" rel="nofollow" href="https://www.academia.edu/117822084/Improved_understanding_of_Diatom_stratigraphy_in_a_varved_sediment_through_lake_monitoring_and_sediment_trap_data"><img alt="Research paper thumbnail of Improved understanding of Diatom stratigraphy in a varved sediment through lake monitoring and sediment trap data" class="work-thumbnail" src="https://a.academia-assets.com/images/blank-paper.jpg" /></a></div><div class="wp-workCard wp-workCard_itemContainer"><div class="wp-workCard_item wp-workCard--title"><a class="js-work-strip-work-link text-gray-darker" data-click-track="profile-work-strip-title" rel="nofollow" href="https://www.academia.edu/117822084/Improved_understanding_of_Diatom_stratigraphy_in_a_varved_sediment_through_lake_monitoring_and_sediment_trap_data">Improved understanding of Diatom stratigraphy in a varved sediment through lake monitoring and sediment trap data</a></div><div class="wp-workCard_item"><span>EGU General Assembly Conference Abstracts</span><span>, Apr 1, 2016</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><span class="wp-workCard--action visible-if-viewed-by-owner inline-block" style="display: none;"><span class="js-profile-work-strip-edit-button-wrapper profile-work-strip-edit-button-wrapper" data-work-id="117822084"><a class="js-profile-work-strip-edit-button" tabindex="0"><span><i class="fa fa-pencil"></i></span><span>Edit</span></a></span></span></div><div class="wp-workCard_item wp-workCard--stats"><span><span><span class="js-view-count view-count u-mr2x" data-work-id="117822084"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 117822084; 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</script> <div class="js-work-strip profile--work_container" data-work-id="117822083"><div class="profile--work_thumbnail hidden-xs"><a class="js-work-strip-work-link" data-click-track="profile-work-strip-thumbnail" href="https://www.academia.edu/117822083/Environmental_footprint_of_small_scale_historical_mining_and_metallurgy_in_the_Swedish_boreal_forest_landscape_The_Moshyttan_blast_furnace_as_microcosm"><img alt="Research paper thumbnail of Environmental footprint of small-scale, historical mining and metallurgy in the Swedish boreal forest landscape: The Moshyttan blast furnace as microcosm" class="work-thumbnail" src="https://attachments.academia-assets.com/113586227/thumbnails/1.jpg" /></a></div><div class="wp-workCard wp-workCard_itemContainer"><div class="wp-workCard_item wp-workCard--title"><a class="js-work-strip-work-link text-gray-darker" data-click-track="profile-work-strip-title" href="https://www.academia.edu/117822083/Environmental_footprint_of_small_scale_historical_mining_and_metallurgy_in_the_Swedish_boreal_forest_landscape_The_Moshyttan_blast_furnace_as_microcosm">Environmental footprint of small-scale, historical mining and metallurgy in the Swedish boreal forest landscape: The Moshyttan blast furnace as microcosm</a></div><div class="wp-workCard_item"><span>The Holocene</span><span>, Jan 31, 2019</span></div><div class="wp-workCard_item"><span class="js-work-more-abstract-truncated">The history of mining and smelting and the associated pollution have been documented using lake s...</span><a class="js-work-more-abstract" data-broccoli-component="work_strip.more_abstract" data-click-track="profile-work-strip-more-abstract" href="javascript:;"><span> more </span><span><i class="fa fa-caret-down"></i></span></a><span class="js-work-more-abstract-untruncated hidden">The history of mining and smelting and the associated pollution have been documented using lake sediments for decades, but the broader ecological implications are not well studied. We analyzed sediment profiles covering the past ~10,000 years from three lakes associated with an iron blast furnace in central Sweden, as an example of the many small-scale furnaces with historical roots in the medieval period. With a focus on long-term lake-water quality, we analyzed multiple proxies including geochemistry, pollen and charcoal, diatom composition and inferred pH, biogenic silica (bSi), visible near-infrared spectroscopy (VNIRS)-inferred lake-water total organic carbon (LW-TOC), and VNIRS-inferred sediment chlorophyll (sed-Chl). All three lakes had stable conditions during the middle Holocene (~5000 BCE to 1110 CE) typical of oligo-dystrophic lakes: pH 5.4-5.6, LW-TOC 15-18 mg L -1 . The most important diatom taxa include, for example, Aulacoseira scalaris, Brachysira neoexilis, and Frustulia saxonica. From ~1150 CE, decreases in LW-TOC, bSi, and sed-Chl in all three lakes coincide with a suite of proxies indicating disturbance associated with local, small-scale agriculture, and the more widespread use of the landscape in the past (e.g. forest grazing, charcoal production). Most important was a decline in LW-TOC by 30-50% in the three lakes prior to the 20th century. In addition, the one lake (Fickeln) downstream of the smelter and main areas of cultivation experienced a shift in diatom composition (mainly increasing Asterionella formosa) and a 0.6 pH increase coinciding with increasing cereal pollen and signs of blast furnace activity. The pH did not change in the other two lakes in response to disturbance; however, these lakes show a slight increase (0.3-0.5 pH units) because of modern liming. LW-TOC has returned to background levels in the downstream lake and remains lower in the other two.</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><a id="c256148c6afd166faf94f341a408ac9d" class="wp-workCard--action" rel="nofollow" data-click-track="profile-work-strip-download" data-download="{"attachment_id":113586227,"asset_id":117822083,"asset_type":"Work","button_location":"profile"}" href="https://www.academia.edu/attachments/113586227/download_file?s=profile"><span><i class="fa fa-arrow-down"></i></span><span>Download</span></a><span class="wp-workCard--action visible-if-viewed-by-owner inline-block" style="display: none;"><span class="js-profile-work-strip-edit-button-wrapper profile-work-strip-edit-button-wrapper" data-work-id="117822083"><a class="js-profile-work-strip-edit-button" tabindex="0"><span><i class="fa fa-pencil"></i></span><span>Edit</span></a></span></span></div><div class="wp-workCard_item wp-workCard--stats"><span><span><span class="js-view-count view-count u-mr2x" data-work-id="117822083"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 117822083; 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dispatcherData = { dispatcher: window.WowProfile.dispatcher, downloadLinkId: "c256148c6afd166faf94f341a408ac9d" } } $('.js-work-strip[data-work-id=117822083]').each(function() { if (!$(this).data('initialized')) { new WowProfile.WorkStripView({ el: this, workJSON: {"id":117822083,"title":"Environmental footprint of small-scale, historical mining and metallurgy in the Swedish boreal forest landscape: The Moshyttan blast furnace as microcosm","internal_url":"https://www.academia.edu/117822083/Environmental_footprint_of_small_scale_historical_mining_and_metallurgy_in_the_Swedish_boreal_forest_landscape_The_Moshyttan_blast_furnace_as_microcosm","owner_id":34310257,"coauthors_can_edit":true,"owner":{"id":34310257,"first_name":"Christian","middle_initials":null,"last_name":"Bigler","page_name":"ChristianBigler","domain_name":"independent","created_at":"2015-08-27T23:00:36.425-07:00","display_name":"Christian Bigler","url":"https://independent.academia.edu/ChristianBigler","email":"RlJwT0hWY0NiRytId3BEYmJxaWdKejVxam81c3BpY2xXY1p0V0xScTlySStuVzNBRlR1enhqN1Q2YWs5ZGZVRi0tV1hZeFZqc3RNZmh1NG1pbktKeHUzZz09--965c1d7f6916b9a2df8ef33274382eb402b41338"},"attachments":[{"id":113586227,"title":"","file_type":"pdf","scribd_thumbnail_url":"https://attachments.academia-assets.com/113586227/thumbnails/1.jpg","file_name":"095968361882474120240421-1-u2p55.pdf","download_url":"https://www.academia.edu/attachments/113586227/download_file","bulk_download_file_name":"Environmental_footprint_of_small_scale_h.pdf","bulk_download_url":"https://d1wqtxts1xzle7.cloudfront.net/113586227/095968361882474120240421-1-u2p55-libre.pdf?1713707121=\u0026response-content-disposition=attachment%3B+filename%3DEnvironmental_footprint_of_small_scale_h.pdf\u0026Expires=1740506989\u0026Signature=G-LqY0kVlUJIgDR2AVzmz3LUktS8-2r4H2bskc4uqjGwRU6K30ZzYXhEv5erpji-iaTZmh13-HiNUsEoj4UC3r5EPK1Oa0Z0Rxu-BuAzSuKtxMcSbQFry0dGzLiYD5hOX~GVE9oC7wtlDka~ALlTxbtc4JpovCJHVTQ~FoMR9uiSxeHb8tLclQxPM6Ss2G1kj0RzbOPRxHhPoYzpdm9iHMhXSieLyH~bkcB0bOdaHO0E1YCMCDyHfE3J6MQ9NftTDDY4ETuwh3Fy5vl0ZDv0TzqcSd~vlTpBtU2vtcxAPrSdP41cBCIZFH~lOgA7TSzg4o6f0rLFJ6~t5pfc-XRfig__\u0026Key-Pair-Id=APKAJLOHF5GGSLRBV4ZA"}]}, dispatcherData: dispatcherData }); $(this).data('initialized', true); } }); $a.trackClickSource(".js-work-strip-work-link", "profile_work_strip") }); </script> <div class="js-work-strip profile--work_container" data-work-id="117822082"><div class="profile--work_thumbnail hidden-xs"><a class="js-work-strip-work-link" data-click-track="profile-work-strip-thumbnail" href="https://www.academia.edu/117822082/Functional_clustering_of_varved_lake_sediment_to_reconstruct_past_seasonal_climate"><img alt="Research paper thumbnail of Functional clustering of varved lake sediment to reconstruct past seasonal climate" class="work-thumbnail" src="https://attachments.academia-assets.com/113586230/thumbnails/1.jpg" /></a></div><div class="wp-workCard wp-workCard_itemContainer"><div class="wp-workCard_item wp-workCard--title"><a class="js-work-strip-work-link text-gray-darker" data-click-track="profile-work-strip-title" href="https://www.academia.edu/117822082/Functional_clustering_of_varved_lake_sediment_to_reconstruct_past_seasonal_climate">Functional clustering of varved lake sediment to reconstruct past seasonal climate</a></div><div class="wp-workCard_item"><span>Environmental and Ecological Statistics</span><span>, Jul 19, 2016</span></div><div class="wp-workCard_item"><span class="js-work-more-abstract-truncated">Annually laminated (varved) lake sediments constitutes excellent environmental archives, and have...</span><a class="js-work-more-abstract" data-broccoli-component="work_strip.more_abstract" data-click-track="profile-work-strip-more-abstract" href="javascript:;"><span> more </span><span><i class="fa fa-caret-down"></i></span></a><span class="js-work-more-abstract-untruncated hidden">Annually laminated (varved) lake sediments constitutes excellent environmental archives, and have the potential to play an important role for understanding past seasonal climate with their inherent annual time resolution and within-year seasonal patterns. We propose to use functional data analysis methods to extract the relevant information with respect to climate reconstruction from the rich but complex information in the varves, including the shapes of the seasonal patterns, the varying varve thickness, and the non-linear sediment accumulation rates. In particular we analyze varved sediment from lake Kassjön in northern Sweden, covering the past 6400 years. The properties of each varve reflect to a large extent weather conditions and internal biological processes in the lake the year that the varve was deposited. Functional clustering is used to group the seasonal patterns into different types, that can be associated with different weather conditions. The seasonal patterns were described by penalized splines and clustered by the k-means algorithm, after alignment. The observed (within-year) variability in the data was used to determine the degree of smoothing for Handling Editor: Bryan F. J. Manly.</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><a id="61d611044eb395fff9d5ada04006abde" class="wp-workCard--action" rel="nofollow" data-click-track="profile-work-strip-download" data-download="{"attachment_id":113586230,"asset_id":117822082,"asset_type":"Work","button_location":"profile"}" href="https://www.academia.edu/attachments/113586230/download_file?s=profile"><span><i class="fa fa-arrow-down"></i></span><span>Download</span></a><span class="wp-workCard--action visible-if-viewed-by-owner inline-block" style="display: none;"><span class="js-profile-work-strip-edit-button-wrapper profile-work-strip-edit-button-wrapper" data-work-id="117822082"><a class="js-profile-work-strip-edit-button" tabindex="0"><span><i class="fa fa-pencil"></i></span><span>Edit</span></a></span></span></div><div class="wp-workCard_item wp-workCard--stats"><span><span><span class="js-view-count view-count u-mr2x" data-work-id="117822082"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 117822082; 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$(this).data('initialized', true); } }); $a.trackClickSource(".js-work-strip-work-link", "profile_work_strip") }); </script> <div class="js-work-strip profile--work_container" data-work-id="117822081"><div class="profile--work_thumbnail hidden-xs"><a class="js-work-strip-work-link" data-click-track="profile-work-strip-thumbnail" href="https://www.academia.edu/117822081/A_multi_proxy_palaeoecological_study_of_Alanen_Laanij%C3%A4rvi_a_boreal_forest_lake_in_Swedish_Lapland"><img alt="Research paper thumbnail of A multi-proxy palaeoecological study of Alanen Laanijärvi, a boreal-forest lake in Swedish Lapland" class="work-thumbnail" src="https://attachments.academia-assets.com/113586226/thumbnails/1.jpg" /></a></div><div class="wp-workCard wp-workCard_itemContainer"><div class="wp-workCard_item wp-workCard--title"><a class="js-work-strip-work-link text-gray-darker" data-click-track="profile-work-strip-title" href="https://www.academia.edu/117822081/A_multi_proxy_palaeoecological_study_of_Alanen_Laanij%C3%A4rvi_a_boreal_forest_lake_in_Swedish_Lapland">A multi-proxy palaeoecological study of Alanen Laanijärvi, a boreal-forest lake in Swedish Lapland</a></div><div class="wp-workCard_item"><span>Boreas</span><span>, Jun 28, 2008</span></div><div class="wp-workCard_item"><span class="js-work-more-abstract-truncated">Chironomids, pollen and spores were used to reconstruct Holocene aquatic and terrestrial environm...</span><a class="js-work-more-abstract" data-broccoli-component="work_strip.more_abstract" data-click-track="profile-work-strip-more-abstract" href="javascript:;"><span> more </span><span><i class="fa fa-caret-down"></i></span></a><span class="js-work-more-abstract-untruncated hidden">Chironomids, pollen and spores were used to reconstruct Holocene aquatic and terrestrial environments at Alanen Laanijärvi, northern Sweden. Chironomid analysis revealed a pattern of limnological evolution from oligotrophic conditions in a relatively deep lake during 8.6 to 5.5 cal. ka BP, followed by a period of lake shallowing from 5.5 to 2.7 cal. ka BP. Increases in acidity and littoral habitat complexity may have occurred from 2.7 cal. ka BP to the present, though some compositional changes may have resulted from human disturbance. Chironomid-inferred mean July air temperatures range between 9.8 C in the Early Holocene to 11.3 C in the Late Holocene. Limitations on chironomid-based quantitative temperature interpretations may exist because of low taxon richness. Diatoms were recovered from the upper sediments only, from about AD 1800. Pollen and spore analysis revealed an early colonizing vegetation of juniper, sedges and birch soon after local deglaciation, followed by birch forests until about 8.3 cal. ka BP. Alder stands occurred locally to 5.5 cal. ka BP, when pine and spruce forests developed and remain to the present day. These results suggest that little major terrestrial vegetation change may occur in some northern environments with predicted future global warming, where it is predicted to be most severe. Aquatic environments may, however, be greatly affected by a shift in precipitation regime, causing changes in allochthonous organic input, lake depth and possibly the amount of human activity or disturbance in the watershed.</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><a id="16be3183dc5259e941669a09a41b8221" class="wp-workCard--action" rel="nofollow" data-click-track="profile-work-strip-download" data-download="{"attachment_id":113586226,"asset_id":117822081,"asset_type":"Work","button_location":"profile"}" href="https://www.academia.edu/attachments/113586226/download_file?s=profile"><span><i class="fa fa-arrow-down"></i></span><span>Download</span></a><span class="wp-workCard--action visible-if-viewed-by-owner inline-block" style="display: none;"><span class="js-profile-work-strip-edit-button-wrapper profile-work-strip-edit-button-wrapper" data-work-id="117822081"><a class="js-profile-work-strip-edit-button" tabindex="0"><span><i class="fa fa-pencil"></i></span><span>Edit</span></a></span></span></div><div class="wp-workCard_item wp-workCard--stats"><span><span><span class="js-view-count view-count u-mr2x" data-work-id="117822081"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 117822081; 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$(this).data('initialized', true); } }); $a.trackClickSource(".js-work-strip-work-link", "profile_work_strip") }); </script> <div class="js-work-strip profile--work_container" data-work-id="117822080"><div class="profile--work_thumbnail hidden-xs"><a class="js-work-strip-work-link" data-click-track="profile-work-strip-thumbnail" href="https://www.academia.edu/117822080/Numerical_simulations_suggest_that_counting_sums_and_taxonomic_resolution_of_diatom_analyses_to_determine_IPS_pollution_and_ACID_acidity_indices_can_be_reduced"><img alt="Research paper thumbnail of Numerical simulations suggest that counting sums and taxonomic resolution of diatom analyses to determine IPS pollution and ACID acidity indices can be reduced" class="work-thumbnail" src="https://attachments.academia-assets.com/113586228/thumbnails/1.jpg" /></a></div><div class="wp-workCard wp-workCard_itemContainer"><div class="wp-workCard_item wp-workCard--title"><a class="js-work-strip-work-link text-gray-darker" data-click-track="profile-work-strip-title" href="https://www.academia.edu/117822080/Numerical_simulations_suggest_that_counting_sums_and_taxonomic_resolution_of_diatom_analyses_to_determine_IPS_pollution_and_ACID_acidity_indices_can_be_reduced">Numerical simulations suggest that counting sums and taxonomic resolution of diatom analyses to determine IPS pollution and ACID acidity indices can be reduced</a></div><div class="wp-workCard_item"><span>Journal of Applied Phycology</span><span>, Dec 4, 2009</span></div><div class="wp-workCard_item"><span class="js-work-more-abstract-truncated">Implementation of the European Union Water Framework Directive and associated national guidelines...</span><a class="js-work-more-abstract" data-broccoli-component="work_strip.more_abstract" data-click-track="profile-work-strip-more-abstract" href="javascript:;"><span> more </span><span><i class="fa fa-caret-down"></i></span></a><span class="js-work-more-abstract-untruncated hidden">Implementation of the European Union Water Framework Directive and associated national guidelines has emphasized the value of using biota, such as epilithic diatoms in streams, as indicators of water quality. However, guidelines for evaluating diatom samples have been established without explicitly evaluating their statistical robustness. We used epilithic diatom samples from 73 streams in northern Sweden and simulated the effects of variations in the counting sum size and taxonomic resolution of classifications for two indices indicating pollution (Indice de Polluo-sensibilité Spécifique, IPS) and acidity (acidity index for diatoms, ACID). Instead of the stipulated 400, we found that a count sum of 40 diatom valves for 50 streams, and 80 valves for 60 streams, would have been sufficient to obtain the same IPS index classification. The ACID index is more sensitive to count sum reductions, since the same classification would only have been obtained for 12 streams with 40 counted diatom valves or 24 streams with a count of 80 valves. Excluding rare taxa had negligible effects on the IPS and ACID indices. Excluding taxa occurring with less than 1.0% frequency affected the IPS classification of only one stream, and excluding taxa with less than 2.5% and 5.0% frequencies affected those of just one and no streams, respectively. The ACID index was affected for none, five, and 12 streams, respectively. At least in relatively unpolluted regions such as northern Sweden, our simulations suggest that a simplified methodological approach with site-specific counting sum sizes and reduced taxonomical resolution could be adopted, taking into account the way sites are classified in relation to established class boundaries. The simplified method is a step forward in improving the cost efficiency for stream monitoring, as costs of diatom analysis to obtain identical IPS and ACID classifications of our streams could be reduced considerably. Before the simplified method can be widely adopted, further simulations including regions with a higher proportion of polluted streams are required.</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><a id="724b7727f43bce615d55b1fa0e7f61d3" class="wp-workCard--action" rel="nofollow" data-click-track="profile-work-strip-download" data-download="{"attachment_id":113586228,"asset_id":117822080,"asset_type":"Work","button_location":"profile"}" href="https://www.academia.edu/attachments/113586228/download_file?s=profile"><span><i class="fa fa-arrow-down"></i></span><span>Download</span></a><span class="wp-workCard--action visible-if-viewed-by-owner inline-block" style="display: none;"><span class="js-profile-work-strip-edit-button-wrapper profile-work-strip-edit-button-wrapper" data-work-id="117822080"><a class="js-profile-work-strip-edit-button" tabindex="0"><span><i class="fa fa-pencil"></i></span><span>Edit</span></a></span></span></div><div class="wp-workCard_item wp-workCard--stats"><span><span><span class="js-view-count view-count u-mr2x" data-work-id="117822080"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 117822080; 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</script> <div class="js-work-strip profile--work_container" data-work-id="117822075"><div class="profile--work_thumbnail hidden-xs"><a class="js-work-strip-work-link" data-click-track="profile-work-strip-thumbnail" rel="nofollow" href="https://www.academia.edu/117822075/Organic_Carbon_Dynamics_beyond_the_Perspective_of_Monitoring_Impact_of_Historical_Landscape_Utilization_on_the_Past_Lake_Water_Carbon_Trajectory_in_Central_Boreal_Sweden"><img alt="Research paper thumbnail of Organic Carbon Dynamics beyond the Perspective of Monitoring: Impact of Historical Landscape Utilization on the Past Lake-Water Carbon Trajectory in Central Boreal Sweden" class="work-thumbnail" src="https://a.academia-assets.com/images/blank-paper.jpg" /></a></div><div class="wp-workCard wp-workCard_itemContainer"><div class="wp-workCard_item wp-workCard--title"><a class="js-work-strip-work-link text-gray-darker" data-click-track="profile-work-strip-title" rel="nofollow" href="https://www.academia.edu/117822075/Organic_Carbon_Dynamics_beyond_the_Perspective_of_Monitoring_Impact_of_Historical_Landscape_Utilization_on_the_Past_Lake_Water_Carbon_Trajectory_in_Central_Boreal_Sweden">Organic Carbon Dynamics beyond the Perspective of Monitoring: Impact of Historical Landscape Utilization on the Past Lake-Water Carbon Trajectory in Central Boreal Sweden</a></div><div class="wp-workCard_item"><span>2014 AGU Fall Meeting</span><span>, Dec 19, 2014</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><span class="wp-workCard--action visible-if-viewed-by-owner inline-block" style="display: none;"><span class="js-profile-work-strip-edit-button-wrapper profile-work-strip-edit-button-wrapper" data-work-id="117822075"><a class="js-profile-work-strip-edit-button" tabindex="0"><span><i class="fa fa-pencil"></i></span><span>Edit</span></a></span></span></div><div class="wp-workCard_item wp-workCard--stats"><span><span><span class="js-view-count view-count u-mr2x" data-work-id="117822075"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 117822075; window.Academia.workViewCountsFetcher.queue(workId, function (count) { var description = window.$h.commaizeInt(count) + " " + window.$h.pluralize(count, 'View'); $(".js-view-count[data-work-id=117822075]").text(description); $(".js-view-count[data-work-id=117822075]").attr('title', description).tooltip(); }); });</script></span></span><span><span class="percentile-widget hidden"><span class="u-mr2x work-percentile"></span></span><script>$(function () { var workId = 117822075; window.Academia.workPercentilesFetcher.queue(workId, function (percentileText) { var container = $(".js-work-strip[data-work-id='117822075']"); container.find('.work-percentile').text(percentileText.charAt(0).toUpperCase() + percentileText.slice(1)); container.find('.percentile-widget').show(); container.find('.percentile-widget').removeClass('hidden'); }); });</script></span></div><div id="work-strip-premium-row-container"></div></div></div><script> require.config({ waitSeconds: 90 })(["https://a.academia-assets.com/assets/wow_profile-a9bf3a2bc8c89fa2a77156577594264ee8a0f214d74241bc0fcd3f69f8d107ac.js","https://a.academia-assets.com/assets/work_edit-ad038b8c047c1a8d4fa01b402d530ff93c45fee2137a149a4a5398bc8ad67560.js"], function() { // from javascript_helper.rb var dispatcherData = {} if (false){ window.WowProfile.dispatcher = window.WowProfile.dispatcher || _.clone(Backbone.Events); dispatcherData = { dispatcher: window.WowProfile.dispatcher, downloadLinkId: "-1" } } $('.js-work-strip[data-work-id=117822075]').each(function() { if (!$(this).data('initialized')) { new WowProfile.WorkStripView({ el: this, workJSON: {"id":117822075,"title":"Organic Carbon Dynamics beyond the Perspective of Monitoring: Impact of Historical Landscape Utilization on the Past Lake-Water Carbon Trajectory in Central Boreal Sweden","internal_url":"https://www.academia.edu/117822075/Organic_Carbon_Dynamics_beyond_the_Perspective_of_Monitoring_Impact_of_Historical_Landscape_Utilization_on_the_Past_Lake_Water_Carbon_Trajectory_in_Central_Boreal_Sweden","owner_id":34310257,"coauthors_can_edit":true,"owner":{"id":34310257,"first_name":"Christian","middle_initials":null,"last_name":"Bigler","page_name":"ChristianBigler","domain_name":"independent","created_at":"2015-08-27T23:00:36.425-07:00","display_name":"Christian Bigler","url":"https://independent.academia.edu/ChristianBigler","email":"cC9XcWREOVBQNk1jblpjTXBzYjlVM3N4d1JjWEJVVUUyNlNhdWFZWS9zaGZyQmdZbXkvenBIdUFNSk9BT1Z1OS0tOEI5Rk41VXNYWDVpQTMvQWp0UTdNQT09--44b95edce9cfd06a8a05942dca0350998b674c01"},"attachments":[]}, dispatcherData: dispatcherData }); $(this).data('initialized', true); } }); $a.trackClickSource(".js-work-strip-work-link", "profile_work_strip") }); </script> <div class="js-work-strip profile--work_container" data-work-id="117822074"><div class="profile--work_thumbnail hidden-xs"><a class="js-work-strip-work-link" data-click-track="profile-work-strip-thumbnail" rel="nofollow" href="https://www.academia.edu/117822074/Spatial_manifestation_of_the_Little_Ice_Age_in_Alaska"><img alt="Research paper thumbnail of Spatial manifestation of the Little Ice Age in Alaska" class="work-thumbnail" src="https://a.academia-assets.com/images/blank-paper.jpg" /></a></div><div class="wp-workCard wp-workCard_itemContainer"><div class="wp-workCard_item wp-workCard--title"><a class="js-work-strip-work-link text-gray-darker" data-click-track="profile-work-strip-title" rel="nofollow" href="https://www.academia.edu/117822074/Spatial_manifestation_of_the_Little_Ice_Age_in_Alaska">Spatial manifestation of the Little Ice Age in Alaska</a></div><div class="wp-workCard_item"><span>AGU Fall Meeting Abstracts</span><span>, Dec 1, 2005</span></div><div class="wp-workCard_item"><span class="js-work-more-abstract-truncated">We present here climate reconstructions of the past 1000 years on the basis of multiproxy sedimen...</span><a class="js-work-more-abstract" data-broccoli-component="work_strip.more_abstract" data-click-track="profile-work-strip-more-abstract" href="javascript:;"><span> more </span><span><i class="fa fa-caret-down"></i></span></a><span class="js-work-more-abstract-untruncated hidden">We present here climate reconstructions of the past 1000 years on the basis of multiproxy sediment analyses at six lakes in three regions of Alaska: the northwestern Alaskan Range (Farewell Lake), the southern Brooks Range (Takahula, Malamute, and Omega Lakes), and the Copper River Basin in southeastern Alaska (Grizzly and Moose Lakes). All three regions show a consistent decline in</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><span class="wp-workCard--action visible-if-viewed-by-owner inline-block" style="display: none;"><span class="js-profile-work-strip-edit-button-wrapper profile-work-strip-edit-button-wrapper" data-work-id="117822074"><a class="js-profile-work-strip-edit-button" tabindex="0"><span><i class="fa fa-pencil"></i></span><span>Edit</span></a></span></span></div><div class="wp-workCard_item wp-workCard--stats"><span><span><span class="js-view-count view-count u-mr2x" data-work-id="117822074"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 117822074; window.Academia.workViewCountsFetcher.queue(workId, function (count) { var description = window.$h.commaizeInt(count) + " " + window.$h.pluralize(count, 'View'); $(".js-view-count[data-work-id=117822074]").text(description); $(".js-view-count[data-work-id=117822074]").attr('title', description).tooltip(); }); });</script></span></span><span><span class="percentile-widget hidden"><span class="u-mr2x work-percentile"></span></span><script>$(function () { var workId = 117822074; window.Academia.workPercentilesFetcher.queue(workId, function (percentileText) { var container = $(".js-work-strip[data-work-id='117822074']"); container.find('.work-percentile').text(percentileText.charAt(0).toUpperCase() + percentileText.slice(1)); container.find('.percentile-widget').show(); container.find('.percentile-widget').removeClass('hidden'); }); });</script></span></div><div id="work-strip-premium-row-container"></div></div></div><script> require.config({ waitSeconds: 90 })(["https://a.academia-assets.com/assets/wow_profile-a9bf3a2bc8c89fa2a77156577594264ee8a0f214d74241bc0fcd3f69f8d107ac.js","https://a.academia-assets.com/assets/work_edit-ad038b8c047c1a8d4fa01b402d530ff93c45fee2137a149a4a5398bc8ad67560.js"], function() { // from javascript_helper.rb var dispatcherData = {} if (false){ window.WowProfile.dispatcher = window.WowProfile.dispatcher || _.clone(Backbone.Events); dispatcherData = { dispatcher: window.WowProfile.dispatcher, downloadLinkId: "-1" } } $('.js-work-strip[data-work-id=117822074]').each(function() { if (!$(this).data('initialized')) { new WowProfile.WorkStripView({ el: this, workJSON: {"id":117822074,"title":"Spatial manifestation of the Little Ice Age in Alaska","internal_url":"https://www.academia.edu/117822074/Spatial_manifestation_of_the_Little_Ice_Age_in_Alaska","owner_id":34310257,"coauthors_can_edit":true,"owner":{"id":34310257,"first_name":"Christian","middle_initials":null,"last_name":"Bigler","page_name":"ChristianBigler","domain_name":"independent","created_at":"2015-08-27T23:00:36.425-07:00","display_name":"Christian Bigler","url":"https://independent.academia.edu/ChristianBigler"},"attachments":[]}, dispatcherData: dispatcherData }); $(this).data('initialized', true); } }); $a.trackClickSource(".js-work-strip-work-link", "profile_work_strip") }); </script> <div class="js-work-strip profile--work_container" data-work-id="117822073"><div class="profile--work_thumbnail hidden-xs"><a class="js-work-strip-work-link" data-click-track="profile-work-strip-thumbnail" href="https://www.academia.edu/117822073/Regional_Holocene_climate_and_landscape_changes_recorded_in_the_large_subarctic_lake_Tornetr%C3%A4sk_N_Fennoscandia"><img alt="Research paper thumbnail of Regional Holocene climate and landscape changes recorded in the large subarctic lake Torneträsk, N Fennoscandia" class="work-thumbnail" src="https://attachments.academia-assets.com/113586206/thumbnails/1.jpg" /></a></div><div class="wp-workCard wp-workCard_itemContainer"><div class="wp-workCard_item wp-workCard--title"><a class="js-work-strip-work-link text-gray-darker" data-click-track="profile-work-strip-title" href="https://www.academia.edu/117822073/Regional_Holocene_climate_and_landscape_changes_recorded_in_the_large_subarctic_lake_Tornetr%C3%A4sk_N_Fennoscandia">Regional Holocene climate and landscape changes recorded in the large subarctic lake Torneträsk, N Fennoscandia</a></div><div class="wp-workCard_item"><span>Palaeogeography, Palaeoclimatology, Palaeoecology</span><span>, Dec 1, 2017</span></div><div class="wp-workCard_item"><span class="js-work-more-abstract-truncated">Understanding the response of sensitive Arctic and subarctic landscapes to climate change is esse...</span><a class="js-work-more-abstract" data-broccoli-component="work_strip.more_abstract" data-click-track="profile-work-strip-more-abstract" href="javascript:;"><span> more </span><span><i class="fa fa-caret-down"></i></span></a><span class="js-work-more-abstract-untruncated hidden">Understanding the response of sensitive Arctic and subarctic landscapes to climate change is essential to determine the risks of ongoing and projected climate warming. However, these responses will not be uniform in terms of timing and magnitude across the landscape because of site-specific differences in ecosystem susceptibility to climate forcing. Here we present a multiproxy analysis of a sediment record from the 330-km 2 lake Torneträsk to assess the sensitivity of the Fennoscandian subarctic landscape to climate change over the past ~9500 years. By comparing responses of this large-lake system to past climatic and environmental changes with those in small lakes in its catchment, we assessed when the magnitude of change was sufficient to affect an entire region rather than only specific sub-catchments that may be more sensitive to localized environmental changes such as, e.g., tree-line dynamics. Our results show three periods of regional landscape alteration with distinct change in sediment composition: i) landscape development following deglaciation and through the Holocene Thermal Maximum, ~9500-3400 cal yr BP; ii) increased soil erosion during the Little Ice Age (LIA); and iii) rapid change during the past century coincident with ongoing climate change. The gradual landscape development led to successive changes in the lake sediment composition over several millennia, whereas climate cooling during the late Holocene caused a rather abrupt shift occurring within ~100 years. However, this shift at the onset of the LIA (~750 cal yr BP) occurred >2000 years later than the first indications for climate cooling recorded in small lakes in the Torneträsk catchment, suggesting that a critical ecosystem threshold was not crossed until the LIA. In contrast, the ongoing response to recent climate change was immediate, emphasizing the unprecedented scale of ongoing climate changes in subarctic Fennoscandia.</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><a id="7ce6fae019fc3cbe2950e73f18b7d0aa" class="wp-workCard--action" rel="nofollow" data-click-track="profile-work-strip-download" data-download="{"attachment_id":113586206,"asset_id":117822073,"asset_type":"Work","button_location":"profile"}" href="https://www.academia.edu/attachments/113586206/download_file?s=profile"><span><i class="fa fa-arrow-down"></i></span><span>Download</span></a><span class="wp-workCard--action visible-if-viewed-by-owner inline-block" style="display: none;"><span class="js-profile-work-strip-edit-button-wrapper profile-work-strip-edit-button-wrapper" data-work-id="117822073"><a class="js-profile-work-strip-edit-button" tabindex="0"><span><i class="fa fa-pencil"></i></span><span>Edit</span></a></span></span></div><div class="wp-workCard_item wp-workCard--stats"><span><span><span class="js-view-count view-count u-mr2x" data-work-id="117822073"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 117822073; window.Academia.workViewCountsFetcher.queue(workId, function (count) { var description = window.$h.commaizeInt(count) + " " + window.$h.pluralize(count, 'View'); $(".js-view-count[data-work-id=117822073]").text(description); $(".js-view-count[data-work-id=117822073]").attr('title', description).tooltip(); }); });</script></span></span><span><span class="percentile-widget hidden"><span class="u-mr2x work-percentile"></span></span><script>$(function () { var workId = 117822073; window.Academia.workPercentilesFetcher.queue(workId, function (percentileText) { var container = $(".js-work-strip[data-work-id='117822073']"); container.find('.work-percentile').text(percentileText.charAt(0).toUpperCase() + percentileText.slice(1)); container.find('.percentile-widget').show(); container.find('.percentile-widget').removeClass('hidden'); }); });</script></span></div><div id="work-strip-premium-row-container"></div></div></div><script> require.config({ waitSeconds: 90 })(["https://a.academia-assets.com/assets/wow_profile-a9bf3a2bc8c89fa2a77156577594264ee8a0f214d74241bc0fcd3f69f8d107ac.js","https://a.academia-assets.com/assets/work_edit-ad038b8c047c1a8d4fa01b402d530ff93c45fee2137a149a4a5398bc8ad67560.js"], function() { // from javascript_helper.rb var dispatcherData = {} if (true){ window.WowProfile.dispatcher = window.WowProfile.dispatcher || _.clone(Backbone.Events); dispatcherData = { dispatcher: window.WowProfile.dispatcher, downloadLinkId: "7ce6fae019fc3cbe2950e73f18b7d0aa" } } $('.js-work-strip[data-work-id=117822073]').each(function() { if (!$(this).data('initialized')) { new WowProfile.WorkStripView({ el: this, workJSON: {"id":117822073,"title":"Regional Holocene climate and landscape changes recorded in the large subarctic lake Torneträsk, N Fennoscandia","internal_url":"https://www.academia.edu/117822073/Regional_Holocene_climate_and_landscape_changes_recorded_in_the_large_subarctic_lake_Tornetr%C3%A4sk_N_Fennoscandia","owner_id":34310257,"coauthors_can_edit":true,"owner":{"id":34310257,"first_name":"Christian","middle_initials":null,"last_name":"Bigler","page_name":"ChristianBigler","domain_name":"independent","created_at":"2015-08-27T23:00:36.425-07:00","display_name":"Christian Bigler","url":"https://independent.academia.edu/ChristianBigler","email":"WmVSY2xqajFwdStUNzRObHZTSHZiRU1UVmRSbXJocUc3dlpuUGpCMUdrSTNCYjNtVU13TUljOGFTS2NpMjRlMS0tNXZjQ3FhcGNkUkFRNHNkd3RyZGhrUT09--8ef9ed2306e8da4c34aced73240a95daa66d8ab8"},"attachments":[{"id":113586206,"title":"","file_type":"pdf","scribd_thumbnail_url":"https://attachments.academia-assets.com/113586206/thumbnails/1.jpg","file_name":"Meyer-Jacob_et_al._2017_Tornetr_C3_A4sk_accepted_manuscript.pdf","download_url":"https://www.academia.edu/attachments/113586206/download_file","bulk_download_file_name":"Regional_Holocene_climate_and_landscape.pdf","bulk_download_url":"https://d1wqtxts1xzle7.cloudfront.net/113586206/Meyer-Jacob_et_al._2017_Tornetr_C3_A4sk_accepted_manuscript-libre.pdf?1713707124=\u0026response-content-disposition=attachment%3B+filename%3DRegional_Holocene_climate_and_landscape.pdf\u0026Expires=1740506989\u0026Signature=WDjrKabEJ~k7yZe-9UYQbpiGgBNWCooF8ky8bO6AAr5XTNVujTkFSapqQ0mE09CmkgruSlDOND8ltP-cIKa~C7We0Wqmc32Bjo6zm4OaFE6ZiilMuCUOIBoDwfRLTEMHKH2WMlOaFeCGgbHlAXjm7maLewH5e3GExWjLyoy2ey5Bp~aSWwc0ldd16vT3t-f7eq5IJAA2x2tWDdUIHBcWOUuXZv8UtxzMNPAwMViJ600wsX4KmlVVXY-f1gNrLJE9Z9wa0LV8T33UpmQEn6Q4ggpYHWS2WG5R9uN-HKxAMHVXwuT4uzw5edAYA4wneF4zRwXvoYdbXwW7lzjoW2FCSQ__\u0026Key-Pair-Id=APKAJLOHF5GGSLRBV4ZA"},{"id":113586205,"title":"","file_type":"pdf","scribd_thumbnail_url":"https://attachments.academia-assets.com/113586205/thumbnails/1.jpg","file_name":"Meyer-Jacob_et_al._2017_Tornetr_C3_A4sk_accepted_manuscript.pdf","download_url":"https://www.academia.edu/attachments/113586205/download_file","bulk_download_file_name":"Regional_Holocene_climate_and_landscape.pdf","bulk_download_url":"https://d1wqtxts1xzle7.cloudfront.net/113586205/Meyer-Jacob_et_al._2017_Tornetr_C3_A4sk_accepted_manuscript-libre.pdf?1713707125=\u0026response-content-disposition=attachment%3B+filename%3DRegional_Holocene_climate_and_landscape.pdf\u0026Expires=1740506989\u0026Signature=MCok7e18TMZ5V2pR3ngPne~QYxoXL3LqFg7TTRhz0CT~l1EpinXA-P-c4ILmsydQg4pTg3nuW5qe9ah0F3IDyzlkE9PX~PmpxS8Y1BKzX66Uw-fNqKBnNjliVdrREPXTYGaEO1vSotC02I8cXPPUMF~xOJHfysp6yG0KByN~x7tu52IqQOYIzCyJFlj7~~6Q5HbFGNDn7j3kwVbrqgI8zydGqZoAQcAW~g3uIwY2yQWKA8yXnuPMab8UsY5eMX6i4r3Z1JTv~ah9t8c2Ss7yMctSu-9qYEeYpHk5LW1VfyZk0TUeK1lF5vnbk3jlP4twhbVU93hBiFDiZR0QiT2SXw__\u0026Key-Pair-Id=APKAJLOHF5GGSLRBV4ZA"}]}, dispatcherData: dispatcherData }); $(this).data('initialized', true); } }); $a.trackClickSource(".js-work-strip-work-link", "profile_work_strip") }); </script> <div class="js-work-strip profile--work_container" data-work-id="117822072"><div class="profile--work_thumbnail hidden-xs"><a class="js-work-strip-work-link" data-click-track="profile-work-strip-thumbnail" rel="nofollow" href="https://www.academia.edu/117822072/Near_Infrared_Spectroscopy_NIRS_of_Epilithic_Material_in_Streams_has_a_Potential_for_Monitoring_Impact_from_Mining"><img alt="Research paper thumbnail of Near-Infrared Spectroscopy (NIRS) of Epilithic Material in Streams has a Potential for Monitoring Impact from Mining" class="work-thumbnail" src="https://a.academia-assets.com/images/blank-paper.jpg" /></a></div><div class="wp-workCard wp-workCard_itemContainer"><div class="wp-workCard_item wp-workCard--title"><a class="js-work-strip-work-link text-gray-darker" data-click-track="profile-work-strip-title" rel="nofollow" href="https://www.academia.edu/117822072/Near_Infrared_Spectroscopy_NIRS_of_Epilithic_Material_in_Streams_has_a_Potential_for_Monitoring_Impact_from_Mining">Near-Infrared Spectroscopy (NIRS) of Epilithic Material in Streams has a Potential for Monitoring Impact from Mining</a></div><div class="wp-workCard_item"><span>Environmental Science & Technology</span><span>, Mar 17, 2007</span></div><div class="wp-workCard_item"><span class="js-work-more-abstract-truncated">There is an increasing demand for cost-effective methods for environmental monitoring, and here w...</span><a class="js-work-more-abstract" data-broccoli-component="work_strip.more_abstract" data-click-track="profile-work-strip-more-abstract" href="javascript:;"><span> more </span><span><i class="fa fa-caret-down"></i></span></a><span class="js-work-more-abstract-untruncated hidden">There is an increasing demand for cost-effective methods for environmental monitoring, and here we assess the potential of near-infrared spectroscopy (NIRS) on epilithic material from streams (material covering submerged stones) as a new method for monitoring the impact of pollution from mining and mining-related industries. NIRS, a routine technique in industry, registers the chemical properties of organic material on a molecular level and can detect minute alterations in the composition of epilithic material. Epilithic samples from 65 stream sites (42 uncontaminated and 23 contaminated) in northern Sweden were analyzed. The NIRS approach was evaluated by comparing it with the results of chemical analyses and diatom analyses of the same samples. Based on Principal Component Analysis, the NIRS data distinguished contaminated from uncontaminated sites and performed slightly betterthan chemical analyses and clearly betterthan diatom analyses. Of the streams designated a priori as contaminated, 74% were identified as contaminated by NIRS, 65% were identified by chemical analysis, and 26% were identified by diatom analysis. Unlike chemical analyses of water samples, NIRS data reflect biological impacts in the streams, and the epilithic material integrates impact over time. Given that, and the simplicity of NIRS-analyses, further studies to assess the use of NIRS of epilithic material as an inexpensive environmental monitoring method are justified.</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><span class="wp-workCard--action visible-if-viewed-by-owner inline-block" style="display: none;"><span class="js-profile-work-strip-edit-button-wrapper profile-work-strip-edit-button-wrapper" data-work-id="117822072"><a class="js-profile-work-strip-edit-button" tabindex="0"><span><i class="fa fa-pencil"></i></span><span>Edit</span></a></span></span></div><div class="wp-workCard_item wp-workCard--stats"><span><span><span class="js-view-count view-count u-mr2x" data-work-id="117822072"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 117822072; window.Academia.workViewCountsFetcher.queue(workId, function (count) { var description = window.$h.commaizeInt(count) + " " + window.$h.pluralize(count, 'View'); 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</script> <div class="js-work-strip profile--work_container" data-work-id="117822070"><div class="profile--work_thumbnail hidden-xs"><a class="js-work-strip-work-link" data-click-track="profile-work-strip-thumbnail" href="https://www.academia.edu/117822070/Similarities_and_discrepancies_between_chironomid_and_diatom_inferred_temperature_reconstructions_through_the_Holocene_at_Lake_850_northern_Sweden"><img alt="Research paper thumbnail of Similarities and discrepancies between chironomid- and diatom-inferred temperature reconstructions through the Holocene at Lake 850, northern Sweden" class="work-thumbnail" src="https://attachments.academia-assets.com/113586223/thumbnails/1.jpg" /></a></div><div class="wp-workCard wp-workCard_itemContainer"><div class="wp-workCard_item wp-workCard--title"><a class="js-work-strip-work-link text-gray-darker" data-click-track="profile-work-strip-title" href="https://www.academia.edu/117822070/Similarities_and_discrepancies_between_chironomid_and_diatom_inferred_temperature_reconstructions_through_the_Holocene_at_Lake_850_northern_Sweden">Similarities and discrepancies between chironomid- and diatom-inferred temperature reconstructions through the Holocene at Lake 850, northern Sweden</a></div><div class="wp-workCard_item"><span>Quaternary International</span><span>, 2004</span></div><div class="wp-workCard_item"><span class="js-work-more-abstract-truncated">A quantitative temperature reconstruction using chironomids and diatoms has been attempted from a...</span><a class="js-work-more-abstract" data-broccoli-component="work_strip.more_abstract" data-click-track="profile-work-strip-more-abstract" href="javascript:;"><span> more </span><span><i class="fa fa-caret-down"></i></span></a><span class="js-work-more-abstract-untruncated hidden">A quantitative temperature reconstruction using chironomids and diatoms has been attempted from a high elevation lake in northern Sweden (Lake 850). Since 7000 cal. years BP, both chironomids and diatoms recorded similar temperatures (in the range of present-day estimates) but the correspondence between chironomid and diatom-inferred temperatures was highest in the recent Holocene (2500 cal. years BP to the present). Between ca. 9000 and 7000 cal. years BP, inferred temperatures from chironomids were warmer than today (ca. 1-2 C), in accord with other climate reconstruction using pollen, plant macrofossils and oxygen isotope analysis in lakes of northern Scandinavia. In contrast, diatom analysis did not infer warmer temperatures during this period. The insensitivity of diatoms to temperature in Lake 850 between 9000 and 7000 cal. years BP could be attributed to other environmental factors affecting the diatom assemblages through time, especially lake-water pH. Diatom-inferred pH showed a gradual decrease (0.5 pH units) between 9000 and 7000 cal. years BP while it remained more or less constant since 7000 cal. years BP. Changes in lakewater pH acting on diatoms seem to mask the effect of climate, leading to temperature reconstructions that are inaccurate. Ways of disentangling climate and other environmental factors when attempting climate reconstruction should be further investigated.</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><a id="e05c11931b4b53488b6888b102c21c41" class="wp-workCard--action" rel="nofollow" data-click-track="profile-work-strip-download" data-download="{"attachment_id":113586223,"asset_id":117822070,"asset_type":"Work","button_location":"profile"}" href="https://www.academia.edu/attachments/113586223/download_file?s=profile"><span><i class="fa fa-arrow-down"></i></span><span>Download</span></a><span class="wp-workCard--action visible-if-viewed-by-owner inline-block" style="display: none;"><span class="js-profile-work-strip-edit-button-wrapper profile-work-strip-edit-button-wrapper" data-work-id="117822070"><a class="js-profile-work-strip-edit-button" tabindex="0"><span><i class="fa fa-pencil"></i></span><span>Edit</span></a></span></span></div><div class="wp-workCard_item wp-workCard--stats"><span><span><span class="js-view-count view-count u-mr2x" data-work-id="117822070"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 117822070; 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dispatcherData = { dispatcher: window.WowProfile.dispatcher, downloadLinkId: "e05c11931b4b53488b6888b102c21c41" } } $('.js-work-strip[data-work-id=117822070]').each(function() { if (!$(this).data('initialized')) { new WowProfile.WorkStripView({ el: this, workJSON: {"id":117822070,"title":"Similarities and discrepancies between chironomid- and diatom-inferred temperature reconstructions through the Holocene at Lake 850, northern Sweden","internal_url":"https://www.academia.edu/117822070/Similarities_and_discrepancies_between_chironomid_and_diatom_inferred_temperature_reconstructions_through_the_Holocene_at_Lake_850_northern_Sweden","owner_id":34310257,"coauthors_can_edit":true,"owner":{"id":34310257,"first_name":"Christian","middle_initials":null,"last_name":"Bigler","page_name":"ChristianBigler","domain_name":"independent","created_at":"2015-08-27T23:00:36.425-07:00","display_name":"Christian Bigler","url":"https://independent.academia.edu/ChristianBigler"},"attachments":[{"id":113586223,"title":"","file_type":"pdf","scribd_thumbnail_url":"https://attachments.academia-assets.com/113586223/thumbnails/1.jpg","file_name":"QuaternaryInternational_122_109.pdf","download_url":"https://www.academia.edu/attachments/113586223/download_file","bulk_download_file_name":"Similarities_and_discrepancies_between_c.pdf","bulk_download_url":"https://d1wqtxts1xzle7.cloudfront.net/113586223/QuaternaryInternational_122_109-libre.pdf?1713707113=\u0026response-content-disposition=attachment%3B+filename%3DSimilarities_and_discrepancies_between_c.pdf\u0026Expires=1740603563\u0026Signature=EZksDrW5UfDkbxZ-tdOzuX4z56y52x92oFpb0-8uoL6cgAcwtINTHItp0CbqBawpr8EvQuO~YNIRyhhuaBS9-SxPvvlmrUeHGyrlmzm3-7mULiHKXeiX7s8wooUgQdTQ7T8RxmbE3C-MdImKJSXHh8IwMe1BhKasS-fZCvTCrsOr8qyvws99f6dzYk3LgUc3AzK63SOEc5yTkwd2i9XoShrMnUh8KRRrvgojG~H-iPHxWVaw2q8SjwUxPW8SFPm-FDdM5ZZ2gqNTDy7K9wuSTcYaPyenRBnRQEm3x388UUwY7My7RnzB4XJSFEkqFdLm5h9-RtdR9RFcrJraEY8unw__\u0026Key-Pair-Id=APKAJLOHF5GGSLRBV4ZA"}]}, dispatcherData: dispatcherData }); $(this).data('initialized', true); } }); $a.trackClickSource(".js-work-strip-work-link", "profile_work_strip") }); </script> <div class="js-work-strip profile--work_container" data-work-id="117822059"><div class="profile--work_thumbnail hidden-xs"><a class="js-work-strip-work-link" data-click-track="profile-work-strip-thumbnail" href="https://www.academia.edu/117822059/Late_Holocene_climate_variability_and_ecosystem_responses_in_Alaska_inferred_from_high_resolution_multiproxy_sediment_analyses_at_Grizzly_Lake"><img alt="Research paper thumbnail of Late-Holocene climate variability and ecosystem responses in Alaska inferred from high-resolution multiproxy sediment analyses at Grizzly Lake" class="work-thumbnail" src="https://attachments.academia-assets.com/113586207/thumbnails/1.jpg" /></a></div><div class="wp-workCard wp-workCard_itemContainer"><div class="wp-workCard_item wp-workCard--title"><a class="js-work-strip-work-link text-gray-darker" data-click-track="profile-work-strip-title" href="https://www.academia.edu/117822059/Late_Holocene_climate_variability_and_ecosystem_responses_in_Alaska_inferred_from_high_resolution_multiproxy_sediment_analyses_at_Grizzly_Lake">Late-Holocene climate variability and ecosystem responses in Alaska inferred from high-resolution multiproxy sediment analyses at Grizzly Lake</a></div><div class="wp-workCard_item"><span>Quaternary Science Reviews</span><span>, Oct 1, 2015</span></div><div class="wp-workCard_item"><span class="js-work-more-abstract-truncated">The late-Holocene shift from Picea glauca (white spruce) to Picea mariana (black spruce) forests ...</span><a class="js-work-more-abstract" data-broccoli-component="work_strip.more_abstract" data-click-track="profile-work-strip-more-abstract" href="javascript:;"><span> more </span><span><i class="fa fa-caret-down"></i></span></a><span class="js-work-more-abstract-untruncated hidden">The late-Holocene shift from Picea glauca (white spruce) to Picea mariana (black spruce) forests marked the establishment of modern boreal forests in Alaska. To understand the patterns and drivers of this vegetational change and the associated late-Holocene environmental dynamics, we analyzed radiocarbon-dated sediments from Grizzly Lake for chironomids, diatoms, pollen, macrofossils, charcoal, element composition, particle size, and magnetic properties for the period 4100e1800 cal BP. Chironomid assemblages reveal two episodes of decreased July temperature, at ca. 3300e3150 (ca À1 C) and 2900e2550 cal BP (ca À2 C). These episodes coincided with climate change elsewhere in the Northern Hemisphere, atmospheric reorganization, and low solar activity. Diatom-inferred lake levels dropped by ca. 5 m at 3200 cal BP, suggesting dry conditions during the period 3200e1800 cal BP. P. glauca declined and P. mariana expanded at ca. 3200 cal BP; this vegetational change was linked to diatom-inferred low lake levels and thus decreased moisture availability. Forest cover declined at 3300e3100, 2800e2500 and 2300e2100 cal BP and soil erosion as inferred from increased values of Al, K, Si, Ti, and Ca intensified, when solar irradiance was low. Plant taxa adapted to disturbance and cold climate (e.g. Alnus viridis, shrub Betula, Epilobium) expanded during these periods of reduced forest cover. This open vegetation type was associated with high fire activity that peaked at 2800 cal BP, when climatic conditions were particularly cold and dry. Forest recovery lagged behind subsequent climate warming (þ3 C) by ca. 75 e225 years. Our multiproxy data set suggests that P. glauca was dominant under warm-moist climatic conditions, whereas P. mariana prevailed under cold-dry and warm-dry conditions. This pattern implies that climatic warming, as anticipated for this century, may promote P. glauca expansions, if moisture availability will be sufficiently high, while P. mariana may expand under dry conditions, possibly exacerbating climate impacts on the fire regime.</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><a id="e1ec3e44203c72ad2306c6a78a9d53cf" class="wp-workCard--action" rel="nofollow" data-click-track="profile-work-strip-download" data-download="{"attachment_id":113586207,"asset_id":117822059,"asset_type":"Work","button_location":"profile"}" href="https://www.academia.edu/attachments/113586207/download_file?s=profile"><span><i class="fa fa-arrow-down"></i></span><span>Download</span></a><span class="wp-workCard--action visible-if-viewed-by-owner inline-block" style="display: none;"><span class="js-profile-work-strip-edit-button-wrapper profile-work-strip-edit-button-wrapper" data-work-id="117822059"><a class="js-profile-work-strip-edit-button" tabindex="0"><span><i class="fa fa-pencil"></i></span><span>Edit</span></a></span></span></div><div class="wp-workCard_item wp-workCard--stats"><span><span><span class="js-view-count view-count u-mr2x" data-work-id="117822059"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 117822059; 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