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class="rdf-meta element-hidden"></span><span property="sioc:num_replies" content="0" datatype="xsd:integer" class="rdf-meta element-hidden"></span> <div class="content"> <div class="field field-name-gdfcf-noticia-type field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even">News</div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even" property="content:encoded"><div class="caption"><img typeof="foaf:Image" src="/sites/default/files/styles/standard_page_full_column/public/WOTH_2_IV.jpg?itok=zV6FNLZG" width="512" height="543" alt="" /><br> A wood thrush outfitted with its nanotag. Photo by Diego Rodríguez.</div> <p>In the Autumn 2024 issue of <em>Living Bird</em> magazine, a publication of Cornell University’s Lab of Ornithology, two ornithologists who work in the Ecuadorian Amazon discuss their research showing that bird populations there are exhibiting even steeper losses than the declines reported for forest birds in North America. Populations of tropical forest birds in this remote Amazon site are down nearly 50% since 2001. “At least 90% of the species that we had enough data to look at are declining, and very few species have shown increases,” says Bette Loiselle, a professor in the Wildlife and Ecology Conservation department at the University of Florida. Some of the bird species hardest hit are insectivores. Similar bird declines are being reported in other protected forests of the tropics. This fact, the scientists note, is puzzling, since these areas are protected from deforestation and habitat loss. More and more, scientists are turning to declining numbers of insects as the main culprit. The article, “<a href="https://www.allaboutbirds.org/news/in-the-tropics-a-troubling-echo-of-north-americas-bird-declines/">In the Tropics, A Troubling Echo of North America’s Bird Declines</a>,” also highlights the work of Drs. <strong>Dan Janzen</strong> and <strong>Winnie Hallwachs</strong> in Área de Conservación Guanacaste and their 2020 study regarding their observations of dramatic declines in insect numbers inside ACG. Also noted were the shifting patterns of precipitation and temperature, as well as the cloud cover in the highest parts of the protected area. The reduction in cloud layer, they said, resulted in drying forest litter, reduced stream flow, and a change in the volume and makeup of the insect population. The article notes that while scientists have different ideas about the factors in Neotropical forest bird declines, one thing they do agree upon is the need for more data to better understand the root causes.</p> <p>The GDFCF <a href="/bird-research">BioAve</a> project is working on the data piece. Using bioacoustics, MOTUS stations, nanotagging, bird banding, and local telemetry, we are trying to understand how birds — particularly neotropical migrants — use ACG’s forests, from where they live, to how they move around, to what they eat. Our focal species, the Wood Thrush, is a forager of insects on the forest floor. So far, our research indicates a robust presence of these birds during their non-breeding season in ACG. We have placed bioacoustics units in 71 locations at 12 sites, with 66% of the sites detecting a Wood Thrush presence. At each station, vegetation measurements were taken to better understand the habitat needs of the species. Overall, 7,200 square meters of land was analyzed. We also ensured that recorders were deployed in the dry forest, cloud forest, and transition zones to both higher and lower elevations. By analyzing the data, <strong>Dr. Natalie Sánchez</strong>, the BioAve project director, has found that frequency of Wood Thrush occupancy is best explained by precipitation and the basal area of trees. This species, therefore, is most likely to inhabit areas with higher rainfall and older-growth forests. The research confirms the value of older-aged, and middle-age rainforests in recovery, to the habitat needs of Wood Thrush. Still, there is much left to learn, and we are increasingly involving the parataxonomists in this research. Natalie will be starting her 2024/2025 field research soon, with a focus on nanotagging migratory birds. We are grateful to the <strong>Conservation, Food & Health Foundation</strong> for funding this work, and our individual donors who support bird research in ACG.<br>  </p> <div class="caption"><img typeof="foaf:Image" src="/sites/default/files/styles/large/public/1986%20Cliff%20top%20Light%20moths.jpg?itok=zgtMABTq" width="480" height="360" alt="" /> <img typeof="foaf:Image" src="/sites/default/files/styles/large/public/2019%20Cliff%20top%20Light%20moths.jpg?itok=S2UmMNga" width="480" height="360" alt="" /><br> These photos show the difference in insects at an insect trap, at the same time of year, between 1986 and 2019, in Área de Conservación Guanacaste. Photos by Daniel Janzen.</div> </div></div></div> </div> <ul class='prev-next-links'> <li class=next>← <a href="/content/announcing-new-gdfcf-executive-director">Announcing New GDFCF Executive Director!</a></li> <li class=prev><a href="/content/studying-small-stuff-2nd-biomar-mini-symposium">Studying the Small Stuff: 2nd BioMar Mini Symposium</a> →</li> </ul> </div> </div> </div> </section> <section class="column column-second column-alpha clearfix"> <div class="panel-pane pane-menu-tree pane-main-menu second-level-menu" > <h2 class="pane-title"> Latest News </h2> <div class="pane-content"> <div class="menu-block-wrapper menu-block-ctools-main-menu-1 menu-name-main-menu parent-mlid-main-menu-0 menu-level-2"> <ul class="menu"><li class="first leaf menu-mlid-1791 menu-468"><a href="/content/dan-and-winnies-firehose-solution">Dan and Winnie's Firehose Solution</a></li> <li class="leaf menu-mlid-1790 menu-468"><a 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ACG">Major Ecosystems of ACG</a><ul class="footer_links_main-menu total-items-4 parent-items-0 single-items-0"><li class="menu-1205 depth-1 fs-no-children first"><a href="/marine">Marine</a></li> <li class="menu-1203 depth-1 fs-no-children"><a href="/dry-forest">Dry Forest</a></li> <li class="menu-1204 depth-1 fs-no-children"><a href="/rain-forest">Rain forest</a></li> <li class="menu-1206 depth-1 fs-no-children last"><a href="/cloud-forest">Cloud Forest</a></li> </ul></li> <li class="menu-1198 depth-1 total-children-3 parent-children-1 single-children-2 last"><a href="/biodiversity-species-and-human-dimensions" title="">Species and Human Dimensions</a><ul class="footer_links_main-menu total-items-3 parent-items-0 single-items-0"><li class="menu-1682 depth-1 fs-no-children first"><a href="/species">Species</a></li> <li class="menu-1683 depth-1 fs-no-children"><a href="/human-dimensions">Human Dimensions</a></li> <li class="menu-1684 depth-1 total-children-0 parent-children-0 single-children-0 last"><a href="/complex-natural-history-stories-0">Complex Natural History: Stories</a></li> </ul></li> </ul></li> <li class="menu-965 depth-1 total-children-5 parent-children-4 single-children-1"><a href="/content/what-we-support" class="fs-root-link">What We Support</a><ul class="footer_links_main-menu total-items-5 parent-items-0 single-items-0"><li class="menu-743 depth-1 total-children-2 parent-children-0 single-children-2 first"><a href="/bioinventory-building-library-life">Bioinventory of ACG</a><ul class="footer_links_main-menu total-items-2 parent-items-0 single-items-0"><li class="menu-1685 depth-1 fs-no-children first"><a href="/terrestrial-parataxonomy">Terrestrial Parataxonomy</a></li> <li class="menu-1686 depth-1 fs-no-children last"><a href="/marine-parataxonomy">Marine Parataxonomy</a></li> </ul></li> <li class="menu-744 depth-1 total-children-2 parent-children-0 single-children-2"><a href="/education-biodevelopment">Education for Biodevelopment</a><ul class="footer_links_main-menu total-items-2 parent-items-0 single-items-0"><li class="menu-753 depth-1 fs-no-children first"><a href="/biological-education-peb">Biological Education (PEB)</a></li> <li class="menu-754 depth-1 fs-no-children last"><a href="/marine-bioawareness">Marine Bioawareness</a></li> </ul></li> <li class="menu-745 depth-1 total-children-2 parent-children-0 single-children-2"><a href="/habitat-restoration">Habitat Restoration</a><ul class="footer_links_main-menu total-items-2 parent-items-0 single-items-0"><li class="menu-751 depth-1 fs-no-children first"><a href="/expanding-acg" title="Short history of growth from 3 national parks to the present ACG.">Expanding ACG</a></li> <li class="menu-752 depth-1 fs-no-children last"><a href="/land-management">Land Management</a></li> </ul></li> <li class="menu-1677 depth-1 fs-no-children"><a href="/bioalfa-bioliteracy-costa-rica">BioAlfa: Bioliteracy for Costa Rica</a></li> <li class="menu-1200 depth-1 total-children-2 parent-children-0 single-children-2 last"><a href="/assisting-acg-biomanagement">Assisting ACG Biomanagement</a><ul class="footer_links_main-menu total-items-2 parent-items-0 single-items-0"><li class="menu-1687 depth-1 fs-no-children first"><a href="/sea-turtle-and-jaguar-research">Sea Turtle and Jaguar Research</a></li> <li class="menu-1762 depth-1 fs-no-children last"><a href="/bird-research">Bird Research</a></li> </ul></li> </ul></li> <li class="menu-963 depth-1 total-children-5 parent-children-0 single-children-5"><a href="/ways" class="fs-root-link">Ways to Help</a><ul class="footer_links_main-menu total-items-5 parent-items-0 single-items-0"><li class="menu-1726 depth-1 fs-no-children first"><a href="/donor-advised-funds">Donor-Advised Funds</a></li> <li class="menu-1725 depth-1 fs-no-children"><a href="/gifts-stock-and-securities">Gifts of Stock and Securities</a></li> <li class="menu-1727 depth-1 fs-no-children"><a href="/ira-qualified-charitable-distribution">IRA Qualified Charitable Distribution</a></li> <li class="menu-1732 depth-1 fs-no-children"><a href="/cryptocurrency">Cryptocurrency</a></li> <li class="menu-1081 depth-1 fs-no-children last"><a href="/current-wish-list">Current Wish List</a></li> </ul></li> <li class="menu-1786 depth-1 fs-no-children"><a href="/ways" title="" class="fs-root-link">Donate</a></li> <li class="menu-468 depth-1 total-children-6 parent-children-0 single-children-6"><a href="/noticia" title="" class="fs-root-link">Latest News</a><ul class="footer_links_main-menu total-items-6 parent-items-0 single-items-0"><li class="menu-1791 depth-1 fs-no-children first"><a href="/content/dan-and-winnies-firehose-solution">Dan and Winnie's Firehose Solution</a></li> <li class="menu-1790 depth-1 fs-no-children"><a href="/content/celebrating-25th-anniversary-unesco-world-heritage-site">Celebrating the 25th Anniversary as a UNESCO World Heritage Site</a></li> <li class="menu-1789 depth-1 fs-no-children"><a href="/content/seasons-greetings-and-latest-newsletter">Season's Greetings and Latest Newsletter</a></li> <li class="menu-1788 depth-1 fs-no-children"><a href="/content/announcing-new-gdfcf-executive-director">Announcing New GDFCF Executive Director!</a></li> <li class="menu-1787 active-trail depth-1 fs-no-children active"><a href="/content/insect-decline-may-be-cause-population-drop-neotropical-birds" class="active-trail active">Insect Decline May Be Cause for Population Drop in Neotropical Birds</a></li> <li class="menu-1785 depth-1 fs-no-children last"><a href="/content/studying-small-stuff-2nd-biomar-mini-symposium">Studying the Small Stuff: 2nd BioMar Mini Symposium</a></li> </ul></li> <li class="menu-1681 depth-1 total-children-8 parent-children-1 single-children-7 last"><a href="/resources" title="" class="fs-root-link">Resources</a><ul class="footer_links_main-menu total-items-8 parent-items-0 single-items-0"><li class="menu-1012 depth-1 fs-no-children first"><a href="/maps">Maps</a></li> <li class="menu-966 depth-1 total-children-0 parent-children-0 single-children-0"><a href="/publications">Publications</a></li> <li class="menu-1015 depth-1 fs-no-children"><a href="/links">Links</a></li> <li class="menu-1482 depth-1 fs-no-children"><a href="http://www.acguanacaste.ac.cr/" title="">ACG website</a></li> <li class="menu-1483 depth-1 fs-no-children"><a href="https://www.facebook.com/gdfcf" title="">Facebook</a></li> <li class="menu-1675 depth-1 fs-no-children"><a href="https://www.instagram.com/guanacaste_dry_forest/" title="">Instagram</a></li> <li class="menu-1676 depth-1 fs-no-children"><a href="https://twitter.com/gdfcf_org" title="">Twitter</a></li> <li class="menu-1492 depth-1 fs-no-children last"><a href="/contact">Contact</a></li> </ul></li> </ul></div> </div> </div> </div> </div></div> </div> </div> </section> </div> </body> </html>