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profile--work_container" data-work-id="6616430"><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/6616430/BIOFRAG_a_new_database_for_analyzing_BIOdiversity_responses_to_forest_FRAGmentation"><img alt="Research paper thumbnail of BIOFRAG – a new database for analyzing BIOdiversity responses to forest FRAGmentation" class="work-thumbnail" src="https://attachments.academia-assets.com/33358246/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/6616430/BIOFRAG_a_new_database_for_analyzing_BIOdiversity_responses_to_forest_FRAGmentation">BIOFRAG – a new database for analyzing BIOdiversity responses to forest FRAGmentation</a></div><div class="wp-workCard_item"><span class="js-work-more-abstract-truncated">Habitat fragmentation studies have produced complex results that are challenging to synthesize. I...</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">Habitat fragmentation studies have produced complex results that are challenging to synthesize. Inconsistencies among studies may result from variation in the choice of landscape metrics and response variables, which is often compounded by a lack of key statistical or methodological information. Collating primary datasets on biodiversity responses to fragmentation in a consistent and <br />flexible database permits simple data retrieval for subsequent analyses. We present a relational database that links such field data to taxonomic nomenclature, spatial and temporal plot attributes, and environmental characteristics. Field assessments include measurements of the response(s) (e.g., presence, abundance, <br />ground cover) of one or more species linked to plots in fragments <br />within a partially forested landscape. The database currently holds 9830 unique species recorded in plots of 58 unique landscapes in six of eight realms: mammals 315, birds 1286, herptiles 460, insects 4521, spiders 204, other arthropods 85, gastropods 70, annelids 8, platyhelminthes 4, Onychophora 2, vascular plants 2112, nonvascular plants and lichens 320, and fungi 449. Three landscapes were sampled as long-term time series (>10 years). Seven hundred and eleven species are found in two or more landscapes. Consolidating the substantial amount of primary data available on biodiversity responses to fragmentation in the context of land-use change and natural disturbances is an essential part of understanding the effects of increasing anthropogenic pressures on land. The consistent format of this database facilitates testing of generalizations concerning biologic responses to fragmentation across diverse systems and taxa. It also allows the re-examination of existing datasets with alternative landscape metrics and robust statistical methods, for example, helping to address pseudoreplication problems. The database can thus help researchers in producing broad syntheses of the effects of land use. The database is dynamic and inclusive, and contributions from individual and large-scale data-collection efforts are welcome.</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><a id="191811a77933ba822a808811c0855de1" class="wp-workCard--action" rel="nofollow" data-click-track="profile-work-strip-download" data-download="{"attachment_id":33358246,"asset_id":6616430,"asset_type":"Work","button_location":"profile"}" href="https://www.academia.edu/attachments/33358246/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="6616430"><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="6616430"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 6616430; 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$(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="6352853"><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/6352853/FUNDAECO_BIRD_MONITORING_PROGRAM_description_and_results_pdf"><img alt="Research paper thumbnail of FUNDAECO_BIRD_MONITORING PROGRAM-description_and_results.pdf" class="work-thumbnail" src="https://attachments.academia-assets.com/33176462/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/6352853/FUNDAECO_BIRD_MONITORING_PROGRAM_description_and_results_pdf">FUNDAECO_BIRD_MONITORING PROGRAM-description_and_results.pdf</a></div><div class="wp-workCard_item"><span class="js-work-more-abstract-truncated">The Resident and Migratory Bird Monitoring Program of the Caribbean Region of Guatemala was estab...</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 Resident and Migratory Bird Monitoring Program of the Caribbean Region of Guatemala was established in 1992, through the cooperation of the Foundation for Ecodevelopment and Conservation (FUNDAECO), a Guatemalan non-governmental organization, and the Patuxent Wildlife Research Center (Biological Division, U.S.G.S.).  The objectives of the program are: 1) to monitor long-term population changes of resident and wintering migratory bird species; 2) to determine habitat use and habitat associations of resident and migratory birds in the Caribbean Region of Guatemala; 4) to evaluate the effects of habitat loss, fragmentation and degradation on the region´s avian communities; 4) to promote conservation efforts of migratory and resident birds through collaboration with other non-governmental and governmental conservation entities; 5) to monitor land use change through satellite image analysis; 6) to train Guatemalan biologists and field technicians in bird assessment and monitoring techniques.  The program has been running four (4) long-term, constant effort banding stations since 1992,  and two (2) since 1996, in Cerro San Gil Watershed Protection Reserve (CSG); also, three (3) additional stations are operated in three reserves besides CSG: Sarstún Multiple Use Reserve, Montaña Chiclera Municipal Reserve and Chocón Nacional Special Protection Area, and one more banding station is scheduled to be established in 2012 in Sierra Caral Special Protection Area. In addition, intensive  point count surveys are carried out at all banding sites, as well as 3 extensive off-road surveys and 8 roadside surveys in three (3) of the aforementioned reserves, corresponding to the Caribbean Region Breeding Bird Survey.  Finally, FUNDAECO´s monitoring program has also partnered with the Institute for Bird Populations (IBP) though the “Monitoreo de Supervivencia Invernal” (MoSI) Program, and is an active member of the Western Hemisphere Bird Banding Network.</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><a id="fe8c49fc2c8e4d80918f5ba179eeca92" class="wp-workCard--action" rel="nofollow" data-click-track="profile-work-strip-download" data-download="{"attachment_id":33176462,"asset_id":6352853,"asset_type":"Work","button_location":"profile"}" href="https://www.academia.edu/attachments/33176462/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="6352853"><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="6352853"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 6352853; 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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="4647660"><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/4647660/Pasture_area_and_landscape_heterogeneity_are_key_determinants_of_bird_diversity_in_intensively_managed_farmland"><img alt="Research paper thumbnail of Pasture area and landscape heterogeneity are key determinants of bird diversity in intensively managed farmland" class="work-thumbnail" src="https://attachments.academia-assets.com/32023582/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/4647660/Pasture_area_and_landscape_heterogeneity_are_key_determinants_of_bird_diversity_in_intensively_managed_farmland">Pasture area and landscape heterogeneity are key determinants of bird diversity in intensively managed farmland</a></div><div class="wp-workCard_item"><span class="js-work-more-abstract-truncated">Agriculture intensification has drastically altered farmland mosaics, while seminatural grassland...</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">Agriculture intensification has drastically altered farmland mosaics, while seminatural grasslands have been considerably reduced and fragmented. Bird declines in northern temperate latitudes are attributed to habitat loss and degradation in farmed landscapes. Conversely, landscape-modification effects on grassland/farmland bird communities are less studied in the South American temperate grasslands. We investigated how bird communities were influenced by landscape characteristics in the Rolling Pampa (Argentina). We sampled bird communities in 356 landscapes of 1-km radius that varied in cover and configuration of pastureland, flooding grassland and cropland. Using generalized linear models, we explored the relationship between both bird species richness and abundance, and landscape structure. Analyses were carried out for all species, and open-habitat, grassland and aquatic species. Pasture area was far the most important factor, followed by landscape composition, in predicting species richness and abundance, irrespective of specific habitat preferences, followed by partially-flooded grassland cover and its mean shape index. Grassland fragmentation did not affect species richness or abundance. When comparing the effects of landscape variables on bird richness and abundance (using mean model coefficients), pasture and grassland area effects were on average more than four times greater than those of compositional heterogeneity, and about ten times greater than shape effects. To conserve species-rich bird communities persisting in Rolling Pampa farmland, we recommend the A. Cerezo Á M. C. Conde</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><a id="5f45069ffdcbdb93a8d5e51e5ca21413" class="wp-workCard--action" rel="nofollow" data-click-track="profile-work-strip-download" data-download="{"attachment_id":32023582,"asset_id":4647660,"asset_type":"Work","button_location":"profile"}" href="https://www.academia.edu/attachments/32023582/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="4647660"><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="4647660"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 4647660; 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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="4647643"><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/4647643/Efecto_de_diferentes_m%C3%A9todos_de_clasificaci%C3%B3n_de_im%C3%A1genes_satelitales_sobre_%C3%ADndices_de_paisaje"><img alt="Research paper thumbnail of Efecto de diferentes métodos de clasificación de imágenes satelitales sobre índices de paisaje" class="work-thumbnail" src="https://attachments.academia-assets.com/32023584/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/4647643/Efecto_de_diferentes_m%C3%A9todos_de_clasificaci%C3%B3n_de_im%C3%A1genes_satelitales_sobre_%C3%ADndices_de_paisaje">Efecto de diferentes métodos de clasificación de imágenes satelitales sobre índices de paisaje</a></div><div class="wp-workCard_item"><span class="js-work-more-abstract-truncated">El estudio de patrones y procesos ecológicos en la escala de paisaje se basa frecuentemente en el...</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">El estudio de patrones y procesos ecológicos en la escala de paisaje se basa frecuentemente en el uso de índices calculados a partir de clasificaciones de cobertura. Las clasificaciones dependen de la resolución espacial y espectral de las imágenes satelitales y pueden realizarse a traves de clasificadores "por píxeles" o "por regiones". El primero solo considera la reflectancia de cada píxel para asignarlo a una clase determinada, y el segundo adicionalmente considera la vecindad del píxel mediante un proceso denominado segmentación, que agrupa píxeles vecinos en regiones homogéneas, previo a la clasificación. El objetivo del presente trabajo es comparar el método de clasificación por regiones con diferentes alternativas del método de clasificación por píxel sobre los índices de caracterización del paisaje en la región pampeana Argentina.</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><a id="9ea1a454d88ac2d3fb18164f533993d1" class="wp-workCard--action" rel="nofollow" data-click-track="profile-work-strip-download" data-download="{"attachment_id":32023584,"asset_id":4647643,"asset_type":"Work","button_location":"profile"}" href="https://www.academia.edu/attachments/32023584/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="4647643"><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="4647643"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 4647643; 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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="4647633"><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/4647633/The_effects_of_landscape_scale_habitat_modification_on_tropical_bird_community_structure_in_eastern_Guatemala"><img alt="Research paper thumbnail of The effects of landscape-scale habitat modification on tropical bird community structure in eastern Guatemala" class="work-thumbnail" src="https://attachments.academia-assets.com/32023586/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/4647633/The_effects_of_landscape_scale_habitat_modification_on_tropical_bird_community_structure_in_eastern_Guatemala">The effects of landscape-scale habitat modification on tropical bird community structure in eastern Guatemala</a></div><div class="wp-workCard_item"><span class="js-work-more-abstract-truncated">Habitat structure and composition affect the distribution and abundance of organisms. The landsca...</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">Habitat structure and composition affect the distribution and abundance of organisms. The landscape perspective extends the study of the determinants of species distribution from the territory and patch scale to the landscape mosaic. Furthermore, not all species are affected equally by landscape structure. Some species may benefit by changes in landscape heterogeneity, while others are negatively affected, through habitat loss and fragmentation, and this effect depends on their life-history characteristics. In this study, we evaluated the effects of landscape-scale habitat modification on the richness, abundance, and species composition of a tropical bird community in Eastern Guatemala. In general terms, we hypothesized that: 1) a reduction in habitat amount has its effects on species mainly through a decrease in population size, and consequently this direct effect is stronger than those of landscape composition and configuration; 2) bird community responses to habitat modification depend on their habitat affinity. We thus predicted that interior-forest species would be more vulnerable than forest-edge species, since the latter have adaptations to disturbed habitat that allow them to tolerate greater habitat modification. We sampled bird communities using point counts in 123 1-km radius landscapes. For each landscape, we quantified the proportional cover of native forest (the sum of primary and secondary tropical forest), forest landscape division index (as a measure of habitat fragmentation), total forest edge and the proportion of primary forest (of the total amount of native forest). Using generalized linear models, we found that: 1) Alexis Cerezo, Susana B. Perelman and Chandler S. Robbins 124 habitat loss and fragmentation effects on species richness were much stronger for interior-forest species than for edge species; 2) bird abundance was insensitive to landscape configuration and composition (proportion of primary forest), and only responded to habitat loss; 3) bird species composition was affected by all landscape metrics, i.e., habitat loss, configuration (fragmentation and edge) and composition. We concluded that: 1) compared to habitat loss, landscape fragmentation effects on bird community parameters were greater in our study than in similar studies in temperate forests; 2) bird community response depended on species affinities: habitat modification effects were much greater for interior-forest species than for edge species; 3) the effects of landscape-level habitat modification vary greatly with respect to the community parameter being evaluated: effects were stronger and more varied on bird community composition and richness, but abundance was affected only by forest cover.</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><a id="5afd4accd14007eac2da1776454c0438" class="wp-workCard--action" rel="nofollow" data-click-track="profile-work-strip-download" data-download="{"attachment_id":32023586,"asset_id":4647633,"asset_type":"Work","button_location":"profile"}" href="https://www.academia.edu/attachments/32023586/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="4647633"><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="4647633"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 4647633; window.Academia.workViewCountsFetcher.queue(workId, function (count) { var description = window.$h.commaizeInt(count) + " " + window.$h.pluralize(count, 'View'); $(".js-view-count[data-work-id=4647633]").text(description); $(".js-view-count[data-work-id=4647633]").attr('title', description).tooltip(); }); });</script></span></span><span><span class="percentile-widget hidden"><span class="u-mr2x work-percentile"></span></span><script>$(function () { var workId = 4647633; window.Academia.workPercentilesFetcher.queue(workId, function (percentileText) { var container = $(".js-work-strip[data-work-id='4647633']"); 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: "5afd4accd14007eac2da1776454c0438" } } $('.js-work-strip[data-work-id=4647633]').each(function() { if (!$(this).data('initialized')) { new WowProfile.WorkStripView({ el: this, workJSON: {"id":4647633,"title":"The effects of landscape-scale habitat modification on tropical bird community structure in eastern Guatemala","internal_url":"https://www.academia.edu/4647633/The_effects_of_landscape_scale_habitat_modification_on_tropical_bird_community_structure_in_eastern_Guatemala","owner_id":4259543,"coauthors_can_edit":true,"owner":{"id":4259543,"first_name":"Alexis","middle_initials":null,"last_name":"Cerezo","page_name":"AlexisCerezo","domain_name":"uba","created_at":"2013-05-20T22:37:33.560-07:00","display_name":"Alexis Cerezo","url":"https://uba.academia.edu/AlexisCerezo"},"attachments":[{"id":32023586,"title":"","file_type":"pdf","scribd_thumbnail_url":"https://attachments.academia-assets.com/32023586/thumbnails/1.jpg","file_name":"Cerezo_etal_2011.pdf","download_url":"https://www.academia.edu/attachments/32023586/download_file","bulk_download_file_name":"The_effects_of_landscape_scale_habitat_m.pdf","bulk_download_url":"https://d1wqtxts1xzle7.cloudfront.net/32023586/Cerezo_etal_2011-libre.pdf?1391477947=\u0026response-content-disposition=attachment%3B+filename%3DThe_effects_of_landscape_scale_habitat_m.pdf\u0026Expires=1739807958\u0026Signature=WcAMoA2uSlpcneVnaR7vgJbb8yP3nzq73jCU7h67jGkXCmRc~mW8K-MZ2LWIyClzrfEZ9bf-1zUEpvTmpF-QXyo6GrVVZTEnKdl1K-seEHUJ-jIxRbKKhJweJT3tollK9rBjCH8WXKolnwoUrOE~MQRbrXmHtaohntUEwb2N71UhnSsLleuJzEEK7X-8K9~UHYia0cM4gCGQZZd0~xlX-ItsvvO7G8auPQyXpGZ-qH5DGI-uMlyPld5nN8CcooDcysbSC9dDsJnqUPbPcAocC2Uqx6DAPNtmwnUq9I86RxuJEBAbBsULUiWWZIF9MRyo9rYUNVMnQVWPMyTNBdSCrQ__\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="3575037"><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/3575037/Landscape_level_impact_of_tropical_forest_loss_and_fragmentation_on_bird_occurrence_in_eastern_Guatemala"><img alt="Research paper thumbnail of Landscape-level impact of tropical forest loss and fragmentation on bird occurrence in eastern Guatemala" class="work-thumbnail" src="https://attachments.academia-assets.com/31281981/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/3575037/Landscape_level_impact_of_tropical_forest_loss_and_fragmentation_on_bird_occurrence_in_eastern_Guatemala">Landscape-level impact of tropical forest loss and fragmentation on bird occurrence in eastern Guatemala</a></div><div class="wp-workCard_item"><span>Ecological Modelling</span><span>, 2010</span></div><div class="wp-workCard_item"><span class="js-work-more-abstract-truncated">Tropical forest destruction and fragmentation of habitat patches may reduce population persistenc...</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">Tropical forest destruction and fragmentation of habitat patches may reduce population persistence at the landscape level. Given the complex nature of simultaneously evaluating the effects of these factors on biotic populations, statistical presence/absence modelling has become an important tool in conservation biology. This study uses logistic regression to evaluate the independent effects of tropical forest cover and fragmentation on bird occurrence in eastern Guatemala. Logistic regression models were constructed for 10 species with varying response to habitat alteration. Predictive variables quantified forest cover, fragmentation and their interaction at three different radii (200, 500 and 1000 m scales) of 112 points where presence of target species was determined. Most species elicited a response to the 1000 m scale, which was greater than most species’ reported territory size. Thus, their presence at the landscape scale is probably regulated by extra-territorial phenomena, such as dispersal. Although proportion of forest cover was the most important predictor of species’ presence, there was strong evidence of area-independent and -dependent fragmentation effects on species presence, results that contrast with other studies from northernmost latitudes. Species’ habitat breadth was positively correlated with AIC model values, indicating a better fit for species more restricted to tropical forest. Species with a narrower habitat breadth also elicited stronger negative responses to forest loss. Habitat breadth is thus a simple measure that can be directly related to species’ vulnerability to landscape modification. Model predictive accuracy was acceptable for 4 of 10 species, which were in turn those with narrower habitat breadths.</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><a id="9f6a717422d421ca0f3e41401119c7ca" class="wp-workCard--action" rel="nofollow" data-click-track="profile-work-strip-download" data-download="{"attachment_id":31281981,"asset_id":3575037,"asset_type":"Work","button_location":"profile"}" href="https://www.academia.edu/attachments/31281981/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="3575037"><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="3575037"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 3575037; 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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="3575035"><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/3575035/MoSI_Monitoreo_de_Sobrevivencia_Invernal_Assessing_Habitat_Specific_Overwintering_Survival_of_Neotropical_Migratory_Landbirds1"><img alt="Research paper thumbnail of MoSI (Monitoreo de Sobrevivencia Invernal): Assessing Habitat-Specific Overwintering Survival of Neotropical Migratory Landbirds1" class="work-thumbnail" src="https://attachments.academia-assets.com/31281974/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/3575035/MoSI_Monitoreo_de_Sobrevivencia_Invernal_Assessing_Habitat_Specific_Overwintering_Survival_of_Neotropical_Migratory_Landbirds1">MoSI (Monitoreo de Sobrevivencia Invernal): Assessing Habitat-Specific Overwintering Survival of Neotropical Migratory Landbirds1</a></div><div class="wp-workCard_item"><span class="js-work-more-abstract-truncated">Recent evidence suggests that population declines in many Neotropical-wintering migratory landbir...</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">Recent evidence suggests that population declines in many Neotropical-wintering migratory landbird species are caused by habitat loss and degradation on their wintering grounds. Such habitat loss and degradation can lower overwintering survival rates and cause surviving birds to leave their wintering grounds in poor physical condition, leading to high mortality during spring migration and low breeding productivity. Large-scale, long-term data on winter demographic parameters of these species and linkages between those parameters and winter habitat characteristics are urgently needed to understand the population dynamics of these migratory landbirds and guide management and conservation efforts for them. We established the MoSI (Monitoreo de Sobrevivencia Invernal) Program to fill this data gap. The objectives of MoSI are: (1) to assess habitat-, age-, and sex-specific overwintering survival rates and late winter physical condition for a suite of target species in a variety of winter habitats by applying state-ofthe-art mark-recapture models to data collected from a network of standardized mist-netting and bird-banding stations throughout Mexico, Central America, and the Caribbean; (2) to use these data to formulate manage-</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><a id="c0289796eb32ab3873e023f0a58b9823" class="wp-workCard--action" rel="nofollow" data-click-track="profile-work-strip-download" data-download="{"attachment_id":31281974,"asset_id":3575035,"asset_type":"Work","button_location":"profile"}" href="https://www.academia.edu/attachments/31281974/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="3575035"><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="3575035"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 3575035; 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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="533953" id="papers"><div class="js-work-strip profile--work_container" data-work-id="6616430"><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/6616430/BIOFRAG_a_new_database_for_analyzing_BIOdiversity_responses_to_forest_FRAGmentation"><img alt="Research paper thumbnail of BIOFRAG – a new database for analyzing BIOdiversity responses to forest FRAGmentation" class="work-thumbnail" src="https://attachments.academia-assets.com/33358246/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/6616430/BIOFRAG_a_new_database_for_analyzing_BIOdiversity_responses_to_forest_FRAGmentation">BIOFRAG – a new database for analyzing BIOdiversity responses to forest FRAGmentation</a></div><div class="wp-workCard_item"><span class="js-work-more-abstract-truncated">Habitat fragmentation studies have produced complex results that are challenging to synthesize. I...</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">Habitat fragmentation studies have produced complex results that are challenging to synthesize. Inconsistencies among studies may result from variation in the choice of landscape metrics and response variables, which is often compounded by a lack of key statistical or methodological information. Collating primary datasets on biodiversity responses to fragmentation in a consistent and <br />flexible database permits simple data retrieval for subsequent analyses. We present a relational database that links such field data to taxonomic nomenclature, spatial and temporal plot attributes, and environmental characteristics. Field assessments include measurements of the response(s) (e.g., presence, abundance, <br />ground cover) of one or more species linked to plots in fragments <br />within a partially forested landscape. The database currently holds 9830 unique species recorded in plots of 58 unique landscapes in six of eight realms: mammals 315, birds 1286, herptiles 460, insects 4521, spiders 204, other arthropods 85, gastropods 70, annelids 8, platyhelminthes 4, Onychophora 2, vascular plants 2112, nonvascular plants and lichens 320, and fungi 449. Three landscapes were sampled as long-term time series (>10 years). Seven hundred and eleven species are found in two or more landscapes. Consolidating the substantial amount of primary data available on biodiversity responses to fragmentation in the context of land-use change and natural disturbances is an essential part of understanding the effects of increasing anthropogenic pressures on land. The consistent format of this database facilitates testing of generalizations concerning biologic responses to fragmentation across diverse systems and taxa. It also allows the re-examination of existing datasets with alternative landscape metrics and robust statistical methods, for example, helping to address pseudoreplication problems. The database can thus help researchers in producing broad syntheses of the effects of land use. The database is dynamic and inclusive, and contributions from individual and large-scale data-collection efforts are welcome.</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><a id="191811a77933ba822a808811c0855de1" class="wp-workCard--action" rel="nofollow" data-click-track="profile-work-strip-download" data-download="{"attachment_id":33358246,"asset_id":6616430,"asset_type":"Work","button_location":"profile"}" href="https://www.academia.edu/attachments/33358246/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="6616430"><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="6616430"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 6616430; 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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="6352853"><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/6352853/FUNDAECO_BIRD_MONITORING_PROGRAM_description_and_results_pdf"><img alt="Research paper thumbnail of FUNDAECO_BIRD_MONITORING PROGRAM-description_and_results.pdf" class="work-thumbnail" src="https://attachments.academia-assets.com/33176462/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/6352853/FUNDAECO_BIRD_MONITORING_PROGRAM_description_and_results_pdf">FUNDAECO_BIRD_MONITORING PROGRAM-description_and_results.pdf</a></div><div class="wp-workCard_item"><span class="js-work-more-abstract-truncated">The Resident and Migratory Bird Monitoring Program of the Caribbean Region of Guatemala was estab...</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 Resident and Migratory Bird Monitoring Program of the Caribbean Region of Guatemala was established in 1992, through the cooperation of the Foundation for Ecodevelopment and Conservation (FUNDAECO), a Guatemalan non-governmental organization, and the Patuxent Wildlife Research Center (Biological Division, U.S.G.S.).  The objectives of the program are: 1) to monitor long-term population changes of resident and wintering migratory bird species; 2) to determine habitat use and habitat associations of resident and migratory birds in the Caribbean Region of Guatemala; 4) to evaluate the effects of habitat loss, fragmentation and degradation on the region´s avian communities; 4) to promote conservation efforts of migratory and resident birds through collaboration with other non-governmental and governmental conservation entities; 5) to monitor land use change through satellite image analysis; 6) to train Guatemalan biologists and field technicians in bird assessment and monitoring techniques.  The program has been running four (4) long-term, constant effort banding stations since 1992,  and two (2) since 1996, in Cerro San Gil Watershed Protection Reserve (CSG); also, three (3) additional stations are operated in three reserves besides CSG: Sarstún Multiple Use Reserve, Montaña Chiclera Municipal Reserve and Chocón Nacional Special Protection Area, and one more banding station is scheduled to be established in 2012 in Sierra Caral Special Protection Area. In addition, intensive  point count surveys are carried out at all banding sites, as well as 3 extensive off-road surveys and 8 roadside surveys in three (3) of the aforementioned reserves, corresponding to the Caribbean Region Breeding Bird Survey.  Finally, FUNDAECO´s monitoring program has also partnered with the Institute for Bird Populations (IBP) though the “Monitoreo de Supervivencia Invernal” (MoSI) Program, and is an active member of the Western Hemisphere Bird Banding Network.</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><a id="fe8c49fc2c8e4d80918f5ba179eeca92" class="wp-workCard--action" rel="nofollow" data-click-track="profile-work-strip-download" data-download="{"attachment_id":33176462,"asset_id":6352853,"asset_type":"Work","button_location":"profile"}" href="https://www.academia.edu/attachments/33176462/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="6352853"><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="6352853"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 6352853; 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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="4647660"><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/4647660/Pasture_area_and_landscape_heterogeneity_are_key_determinants_of_bird_diversity_in_intensively_managed_farmland"><img alt="Research paper thumbnail of Pasture area and landscape heterogeneity are key determinants of bird diversity in intensively managed farmland" class="work-thumbnail" src="https://attachments.academia-assets.com/32023582/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/4647660/Pasture_area_and_landscape_heterogeneity_are_key_determinants_of_bird_diversity_in_intensively_managed_farmland">Pasture area and landscape heterogeneity are key determinants of bird diversity in intensively managed farmland</a></div><div class="wp-workCard_item"><span class="js-work-more-abstract-truncated">Agriculture intensification has drastically altered farmland mosaics, while seminatural grassland...</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">Agriculture intensification has drastically altered farmland mosaics, while seminatural grasslands have been considerably reduced and fragmented. Bird declines in northern temperate latitudes are attributed to habitat loss and degradation in farmed landscapes. Conversely, landscape-modification effects on grassland/farmland bird communities are less studied in the South American temperate grasslands. We investigated how bird communities were influenced by landscape characteristics in the Rolling Pampa (Argentina). We sampled bird communities in 356 landscapes of 1-km radius that varied in cover and configuration of pastureland, flooding grassland and cropland. Using generalized linear models, we explored the relationship between both bird species richness and abundance, and landscape structure. Analyses were carried out for all species, and open-habitat, grassland and aquatic species. Pasture area was far the most important factor, followed by landscape composition, in predicting species richness and abundance, irrespective of specific habitat preferences, followed by partially-flooded grassland cover and its mean shape index. Grassland fragmentation did not affect species richness or abundance. When comparing the effects of landscape variables on bird richness and abundance (using mean model coefficients), pasture and grassland area effects were on average more than four times greater than those of compositional heterogeneity, and about ten times greater than shape effects. To conserve species-rich bird communities persisting in Rolling Pampa farmland, we recommend the A. Cerezo Á M. C. Conde</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><a id="5f45069ffdcbdb93a8d5e51e5ca21413" class="wp-workCard--action" rel="nofollow" data-click-track="profile-work-strip-download" data-download="{"attachment_id":32023582,"asset_id":4647660,"asset_type":"Work","button_location":"profile"}" href="https://www.academia.edu/attachments/32023582/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="4647660"><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="4647660"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 4647660; 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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="4647643"><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/4647643/Efecto_de_diferentes_m%C3%A9todos_de_clasificaci%C3%B3n_de_im%C3%A1genes_satelitales_sobre_%C3%ADndices_de_paisaje"><img alt="Research paper thumbnail of Efecto de diferentes métodos de clasificación de imágenes satelitales sobre índices de paisaje" class="work-thumbnail" src="https://attachments.academia-assets.com/32023584/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/4647643/Efecto_de_diferentes_m%C3%A9todos_de_clasificaci%C3%B3n_de_im%C3%A1genes_satelitales_sobre_%C3%ADndices_de_paisaje">Efecto de diferentes métodos de clasificación de imágenes satelitales sobre índices de paisaje</a></div><div class="wp-workCard_item"><span class="js-work-more-abstract-truncated">El estudio de patrones y procesos ecológicos en la escala de paisaje se basa frecuentemente en el...</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">El estudio de patrones y procesos ecológicos en la escala de paisaje se basa frecuentemente en el uso de índices calculados a partir de clasificaciones de cobertura. Las clasificaciones dependen de la resolución espacial y espectral de las imágenes satelitales y pueden realizarse a traves de clasificadores "por píxeles" o "por regiones". El primero solo considera la reflectancia de cada píxel para asignarlo a una clase determinada, y el segundo adicionalmente considera la vecindad del píxel mediante un proceso denominado segmentación, que agrupa píxeles vecinos en regiones homogéneas, previo a la clasificación. El objetivo del presente trabajo es comparar el método de clasificación por regiones con diferentes alternativas del método de clasificación por píxel sobre los índices de caracterización del paisaje en la región pampeana Argentina.</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><a id="9ea1a454d88ac2d3fb18164f533993d1" class="wp-workCard--action" rel="nofollow" data-click-track="profile-work-strip-download" data-download="{"attachment_id":32023584,"asset_id":4647643,"asset_type":"Work","button_location":"profile"}" href="https://www.academia.edu/attachments/32023584/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="4647643"><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="4647643"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 4647643; 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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="4647633"><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/4647633/The_effects_of_landscape_scale_habitat_modification_on_tropical_bird_community_structure_in_eastern_Guatemala"><img alt="Research paper thumbnail of The effects of landscape-scale habitat modification on tropical bird community structure in eastern Guatemala" class="work-thumbnail" src="https://attachments.academia-assets.com/32023586/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/4647633/The_effects_of_landscape_scale_habitat_modification_on_tropical_bird_community_structure_in_eastern_Guatemala">The effects of landscape-scale habitat modification on tropical bird community structure in eastern Guatemala</a></div><div class="wp-workCard_item"><span class="js-work-more-abstract-truncated">Habitat structure and composition affect the distribution and abundance of organisms. The landsca...</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">Habitat structure and composition affect the distribution and abundance of organisms. The landscape perspective extends the study of the determinants of species distribution from the territory and patch scale to the landscape mosaic. Furthermore, not all species are affected equally by landscape structure. Some species may benefit by changes in landscape heterogeneity, while others are negatively affected, through habitat loss and fragmentation, and this effect depends on their life-history characteristics. In this study, we evaluated the effects of landscape-scale habitat modification on the richness, abundance, and species composition of a tropical bird community in Eastern Guatemala. In general terms, we hypothesized that: 1) a reduction in habitat amount has its effects on species mainly through a decrease in population size, and consequently this direct effect is stronger than those of landscape composition and configuration; 2) bird community responses to habitat modification depend on their habitat affinity. We thus predicted that interior-forest species would be more vulnerable than forest-edge species, since the latter have adaptations to disturbed habitat that allow them to tolerate greater habitat modification. We sampled bird communities using point counts in 123 1-km radius landscapes. For each landscape, we quantified the proportional cover of native forest (the sum of primary and secondary tropical forest), forest landscape division index (as a measure of habitat fragmentation), total forest edge and the proportion of primary forest (of the total amount of native forest). Using generalized linear models, we found that: 1) Alexis Cerezo, Susana B. Perelman and Chandler S. Robbins 124 habitat loss and fragmentation effects on species richness were much stronger for interior-forest species than for edge species; 2) bird abundance was insensitive to landscape configuration and composition (proportion of primary forest), and only responded to habitat loss; 3) bird species composition was affected by all landscape metrics, i.e., habitat loss, configuration (fragmentation and edge) and composition. We concluded that: 1) compared to habitat loss, landscape fragmentation effects on bird community parameters were greater in our study than in similar studies in temperate forests; 2) bird community response depended on species affinities: habitat modification effects were much greater for interior-forest species than for edge species; 3) the effects of landscape-level habitat modification vary greatly with respect to the community parameter being evaluated: effects were stronger and more varied on bird community composition and richness, but abundance was affected only by forest cover.</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><a id="5afd4accd14007eac2da1776454c0438" class="wp-workCard--action" rel="nofollow" data-click-track="profile-work-strip-download" data-download="{"attachment_id":32023586,"asset_id":4647633,"asset_type":"Work","button_location":"profile"}" href="https://www.academia.edu/attachments/32023586/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="4647633"><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="4647633"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 4647633; window.Academia.workViewCountsFetcher.queue(workId, function (count) { var description = window.$h.commaizeInt(count) + " " + window.$h.pluralize(count, 'View'); $(".js-view-count[data-work-id=4647633]").text(description); $(".js-view-count[data-work-id=4647633]").attr('title', description).tooltip(); }); });</script></span></span><span><span class="percentile-widget hidden"><span class="u-mr2x work-percentile"></span></span><script>$(function () { var workId = 4647633; window.Academia.workPercentilesFetcher.queue(workId, function (percentileText) { var container = $(".js-work-strip[data-work-id='4647633']"); 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: "5afd4accd14007eac2da1776454c0438" } } $('.js-work-strip[data-work-id=4647633]').each(function() { if (!$(this).data('initialized')) { new WowProfile.WorkStripView({ el: this, workJSON: {"id":4647633,"title":"The effects of landscape-scale habitat modification on tropical bird community structure in eastern Guatemala","internal_url":"https://www.academia.edu/4647633/The_effects_of_landscape_scale_habitat_modification_on_tropical_bird_community_structure_in_eastern_Guatemala","owner_id":4259543,"coauthors_can_edit":true,"owner":{"id":4259543,"first_name":"Alexis","middle_initials":null,"last_name":"Cerezo","page_name":"AlexisCerezo","domain_name":"uba","created_at":"2013-05-20T22:37:33.560-07:00","display_name":"Alexis Cerezo","url":"https://uba.academia.edu/AlexisCerezo"},"attachments":[{"id":32023586,"title":"","file_type":"pdf","scribd_thumbnail_url":"https://attachments.academia-assets.com/32023586/thumbnails/1.jpg","file_name":"Cerezo_etal_2011.pdf","download_url":"https://www.academia.edu/attachments/32023586/download_file","bulk_download_file_name":"The_effects_of_landscape_scale_habitat_m.pdf","bulk_download_url":"https://d1wqtxts1xzle7.cloudfront.net/32023586/Cerezo_etal_2011-libre.pdf?1391477947=\u0026response-content-disposition=attachment%3B+filename%3DThe_effects_of_landscape_scale_habitat_m.pdf\u0026Expires=1739807958\u0026Signature=WcAMoA2uSlpcneVnaR7vgJbb8yP3nzq73jCU7h67jGkXCmRc~mW8K-MZ2LWIyClzrfEZ9bf-1zUEpvTmpF-QXyo6GrVVZTEnKdl1K-seEHUJ-jIxRbKKhJweJT3tollK9rBjCH8WXKolnwoUrOE~MQRbrXmHtaohntUEwb2N71UhnSsLleuJzEEK7X-8K9~UHYia0cM4gCGQZZd0~xlX-ItsvvO7G8auPQyXpGZ-qH5DGI-uMlyPld5nN8CcooDcysbSC9dDsJnqUPbPcAocC2Uqx6DAPNtmwnUq9I86RxuJEBAbBsULUiWWZIF9MRyo9rYUNVMnQVWPMyTNBdSCrQ__\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="3575037"><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/3575037/Landscape_level_impact_of_tropical_forest_loss_and_fragmentation_on_bird_occurrence_in_eastern_Guatemala"><img alt="Research paper thumbnail of Landscape-level impact of tropical forest loss and fragmentation on bird occurrence in eastern Guatemala" class="work-thumbnail" src="https://attachments.academia-assets.com/31281981/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/3575037/Landscape_level_impact_of_tropical_forest_loss_and_fragmentation_on_bird_occurrence_in_eastern_Guatemala">Landscape-level impact of tropical forest loss and fragmentation on bird occurrence in eastern Guatemala</a></div><div class="wp-workCard_item"><span>Ecological Modelling</span><span>, 2010</span></div><div class="wp-workCard_item"><span class="js-work-more-abstract-truncated">Tropical forest destruction and fragmentation of habitat patches may reduce population persistenc...</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">Tropical forest destruction and fragmentation of habitat patches may reduce population persistence at the landscape level. Given the complex nature of simultaneously evaluating the effects of these factors on biotic populations, statistical presence/absence modelling has become an important tool in conservation biology. This study uses logistic regression to evaluate the independent effects of tropical forest cover and fragmentation on bird occurrence in eastern Guatemala. Logistic regression models were constructed for 10 species with varying response to habitat alteration. Predictive variables quantified forest cover, fragmentation and their interaction at three different radii (200, 500 and 1000 m scales) of 112 points where presence of target species was determined. Most species elicited a response to the 1000 m scale, which was greater than most species’ reported territory size. Thus, their presence at the landscape scale is probably regulated by extra-territorial phenomena, such as dispersal. Although proportion of forest cover was the most important predictor of species’ presence, there was strong evidence of area-independent and -dependent fragmentation effects on species presence, results that contrast with other studies from northernmost latitudes. Species’ habitat breadth was positively correlated with AIC model values, indicating a better fit for species more restricted to tropical forest. Species with a narrower habitat breadth also elicited stronger negative responses to forest loss. Habitat breadth is thus a simple measure that can be directly related to species’ vulnerability to landscape modification. Model predictive accuracy was acceptable for 4 of 10 species, which were in turn those with narrower habitat breadths.</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><a id="9f6a717422d421ca0f3e41401119c7ca" class="wp-workCard--action" rel="nofollow" data-click-track="profile-work-strip-download" data-download="{"attachment_id":31281981,"asset_id":3575037,"asset_type":"Work","button_location":"profile"}" href="https://www.academia.edu/attachments/31281981/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="3575037"><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="3575037"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 3575037; 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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="3575035"><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/3575035/MoSI_Monitoreo_de_Sobrevivencia_Invernal_Assessing_Habitat_Specific_Overwintering_Survival_of_Neotropical_Migratory_Landbirds1"><img alt="Research paper thumbnail of MoSI (Monitoreo de Sobrevivencia Invernal): Assessing Habitat-Specific Overwintering Survival of Neotropical Migratory Landbirds1" class="work-thumbnail" src="https://attachments.academia-assets.com/31281974/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/3575035/MoSI_Monitoreo_de_Sobrevivencia_Invernal_Assessing_Habitat_Specific_Overwintering_Survival_of_Neotropical_Migratory_Landbirds1">MoSI (Monitoreo de Sobrevivencia Invernal): Assessing Habitat-Specific Overwintering Survival of Neotropical Migratory Landbirds1</a></div><div class="wp-workCard_item"><span class="js-work-more-abstract-truncated">Recent evidence suggests that population declines in many Neotropical-wintering migratory landbir...</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">Recent evidence suggests that population declines in many Neotropical-wintering migratory landbird species are caused by habitat loss and degradation on their wintering grounds. Such habitat loss and degradation can lower overwintering survival rates and cause surviving birds to leave their wintering grounds in poor physical condition, leading to high mortality during spring migration and low breeding productivity. Large-scale, long-term data on winter demographic parameters of these species and linkages between those parameters and winter habitat characteristics are urgently needed to understand the population dynamics of these migratory landbirds and guide management and conservation efforts for them. We established the MoSI (Monitoreo de Sobrevivencia Invernal) Program to fill this data gap. The objectives of MoSI are: (1) to assess habitat-, age-, and sex-specific overwintering survival rates and late winter physical condition for a suite of target species in a variety of winter habitats by applying state-ofthe-art mark-recapture models to data collected from a network of standardized mist-netting and bird-banding stations throughout Mexico, Central America, and the Caribbean; (2) to use these data to formulate manage-</span></div><div class="wp-workCard_item wp-workCard--actions"><span class="work-strip-bookmark-button-container"></span><a id="c0289796eb32ab3873e023f0a58b9823" class="wp-workCard--action" rel="nofollow" data-click-track="profile-work-strip-download" data-download="{"attachment_id":31281974,"asset_id":3575035,"asset_type":"Work","button_location":"profile"}" href="https://www.academia.edu/attachments/31281974/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="3575035"><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="3575035"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 3575035; 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