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<blockquote style="position: relative; padding-left: 55px;"><section><a href="https://techhub.social/users/GregCocks/statuses/113511119097949927">GregCocks (gregcocks@techhub.social)'s status on Wednesday, 20-Nov-2024 04:35:36 JST</a><a href="https://techhub.social/@GregCocks" title="gregcocks@techhub.social"><img src="https://gnusocial.jp/avatar/256321-48-20240420000635.webp" width="48" height="48" alt="GregCocks" style="position: absolute; left: 0; top: 0;">GregCocks</a></section><article><p>Magnetic Displacement Experiment Challenges Long-Held Theories On How Migratory Birds Navigate<br>--<br><a href="https://phys.org/news/2024-11-magnetic-displacement-held-theories-migratory.html" rel="nofollow noreferrer">https://phys.org/news/2024-11-magnetic-displacement-held-theories-migratory.html</a>  &lt;-- shared technical article<br>--<br><a href="https://doi.org/10.1098/rspb.2024.1363" rel="nofollow noreferrer">https://doi.org/10.1098/rspb.2024.1363</a>  &lt;-- shared paper<br>--<br><a href="https://techhub.social/tags/GIS" rel="tag">#GIS</a> <a href="https://techhub.social/tags/spatial" rel="tag">#spatial</a> <a href="https://techhub.social/tags/mapping" rel="tag">#mapping</a> <a href="https://techhub.social/tags/migration" rel="tag">#migration</a> <a href="https://techhub.social/tags/magnetism" rel="tag">#magnetism</a> <a href="https://techhub.social/tags/geomagnetism" rel="tag">#geomagnetism</a> <a href="https://techhub.social/tags/inclination" rel="tag">#inclination</a> <a href="https://techhub.social/tags/declination" rel="tag">#declination</a> <a href="https://techhub.social/tags/bird" rel="tag">#bird</a> <a href="https://techhub.social/tags/avian" rel="tag">#avian</a> <a href="https://techhub.social/tags/navigation" rel="tag">#navigation</a> <a href="https://techhub.social/tags/biology" rel="tag">#biology</a> <a href="https://techhub.social/tags/ecosystems" rel="tag">#ecosystems</a> <a href="https://techhub.social/tags/migratorybirds" rel="tag">#migratorybirds</a> <a href="https://techhub.social/tags/breeding" rel="tag">#breeding</a> <a href="https://techhub.social/tags/wintering" rel="tag">#wintering</a> <a href="https://techhub.social/tags/reedwarblers" rel="tag">#reedwarblers</a> <a href="https://techhub.social/tags/research" rel="tag">#research</a> <a href="https://techhub.social/tags/experimentation" rel="tag">#experimentation</a> <a href="https://techhub.social/tags/magneticfield" rel="tag">#magneticfield</a></p></article><footer><a rel="bookmark" href="https://gnusocial.jp/conversation/4030650#notice-7876554">In conversation</a><time datetime="2024-11-20T04:35:36+09:00" title="Wednesday, 20-Nov-2024 04:35:36 JST">about 9 months ago</time> <span>from <span><a href="https://techhub.social/@GregCocks/113511119097949927" rel="external" title="Sent from techhub.social via ActivityPub">techhub.social</a></span></span><a href="https://techhub.social/@GregCocks/113511119097949927">permalink</a><h4>Attachments</h4><ol><li><label><a rel="external" href="https://gnusocial.jp/attachment/3524719">photo - Eurasian reed warbler</a></label><br><a href="https://files.techhub.social/media_attachments/files/113/511/109/547/017/523/original/e37ef0e2c0ab7aa6.jpg" rel="external">https://files.techhub.social/media_attachments/files/113/511/109/547/017/523/original/e37ef0e2c0ab7aa6.jpg</a></li><li><label><a rel="external" href="https://gnusocial.jp/attachment/3524720">maps and charts - Predicted responses and results for the CMF treatment. (a) Map illustrating Eurasian reed warblers’ natural migratory direction (black arrow) from the study site (Illmitz, Austria; black dot) under natural magnetic field (NMF) conditions during autumn and the predicted migratory directions from the virtual displacement site (Neftekamsk, Russia; white dot) under changed magnetic field (CMF) conditions (magnetic inclination and magnetic declination changed), if birds do (white arrow) or do not (black arrow) perceive these magnetic values as a translocation and respond by re-orienting towards the site of capture or the migratory corridor of the population (see [other figure] for map colour key). Dashed isolines give values naturally occurring near the virtual displacement site (see Methods for exact values). (b) Orientation of birds tested under NMF conditions of the study site (left) and under CMF conditions (right). Black dots indicate the mean direction of each individual bird tested; arrows show the second-order mean directions and their vector lengths; the inner and outer dashed circles indicate the threshold needed for significance by the Rayleigh test (p &lt; 0.05 and p &lt; 0.01, respectively); solid lines either side of mean vectors show the 95% confidence intervals. (c) Results from our previous virtual magnetic displacements. Both the study site and the virtual displacement site are the same as in the current study.</a></label><br><a href="https://files.techhub.social/media_attachments/files/113/511/109/583/373/274/original/474b5ebcc5ba3ede.jpg" rel="external">https://files.techhub.social/media_attachments/files/113/511/109/583/373/274/original/474b5ebcc5ba3ede.jpg</a></li><li><label><a rel="external" href="https://gnusocial.jp/attachment/3524721">map and photo =- Distribution range of reed warblers across Europe, Northern and Central Africa and the geospatial context of cues derived from the Earth’s magnetic field in these areas. The black dot indicates the location of the study site. The natural migratory direction given in the map (black arrow) has been derived from reed warblers banded at or near the study site. Mean direction: α = 156°, 95% confidence interval (CI) = 144−175°, n = 19; Rayleigh test of uniformity: r = 0.80, p &lt; 0.001. The recoveries are depicted as great circle lines (black). The Eurasian reed warblers’ distribution range is shown in yellow (summer), green (all year) and light blue (winter), respectively. Isolines of cues derived from the Earth’s magnetic field, i.e. magnetic inclination (blue), magnetic declination (red) and total magnetic intensity (dark grey) are depicted as solid lines. Eurasian reed warbler distribution data were provided by BirdLife International and the Handbook of the Birds of the World (http://datazone.birdlife.org/species/requestdis).</a></label><br><a href="https://files.techhub.social/media_attachments/files/113/511/109/591/332/074/original/2142fc8fa505f629.jpg" rel="external">https://files.techhub.social/media_attachments/files/113/511/109/591/332/074/original/2142fc8fa505f629.jpg</a></li><li><label><a rel="external" href="https://gnusocial.jp/attachment/3524722">Reed warblers migration through northwestern India to the south. This graphic was constructed through the use of information gathered by bird watchers. This graphic was obtained from Bird Count India’s page of Blyth’s Reed Warblers: https://birdcount.in/migration-map/blrwar1/
[from: https://pages.vassar.edu/sensoryecology/bird-migration-a-magnetic-pull-for-mating/]</a></label><br><video poster="" controls="controls"><source src="https://files.techhub.social/media_attachments/files/113/511/109/971/783/528/original/d94dd4d3353a5caa.mp4" type="video/mp4"></source></video></li><li><article><header><div>Domain not in remote thumbnail source whitelist: scx2.b-cdn.net</div><h5><a href="https://phys.org/news/2024-11-magnetic-displacement-held-theories-migratory.html">Magnetic displacement experiment challenges long-held theories on how migratory birds navigate</a></h5><div></div></header><div>Migratory birds are known for their ability to traverse thousands of kilometers to reach their breeding or wintering grounds. Research by Bangor University found that these birds, in this case, Eurasian reed warblers (Acrocephalus scirpaceus) use only the Earth's magnetic inclination and declination to determine their position and direction.</div><footer></footer></article></li><li><label><a rel="external" href="https://gnusocial.jp/attachment/3524724">Untitled attachment</a></label><br></li></ol></footer></blockquote>

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GregCocks (gregcocks@techhub.social)'s status on Wednesday, 20-Nov-2024 04:35:36 JST GregCocks
Magnetic Displacement Experiment Challenges Long-Held Theories On How Migratory Birds Navigate
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https://phys.org/news/2024-11-magnetic-displacement-held-theories-migratory.html <-- shared technical article
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https://doi.org/10.1098/rspb.2024.1363 <-- shared paper
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#GIS #spatial #mapping #migration #magnetism #geomagnetism #inclination #declination #bird #avian #navigation #biology #ecosystems #migratorybirds #breeding #wintering #reedwarblers #research #experimentation #magneticfield
In conversationabout 9 months ago from techhub.socialpermalink
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