First successful test of wild minke whales reveals they have ultrasonic hearing

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<p> <span class="tick-mark"></span> trusted source </p> <p> <span class="tick-mark"></span> proofread </p> </div> </div> </div> <h1 class="text-extra-large line-low mb-2">First successful test of wild minke whales reveals they have ultrasonic hearing</h1> <p class="article-byline text-low"> by Bob Yirka , Phys.org </p> <div class="mt-4 article-main"> <div class="article-gallery lightGallery"> <div data-thumb="https://scx1.b-cdn.net/csz/news/tmb/2024/first-successful-heari.jpg" data-src="https://scx2.b-cdn.net/gfx/news/hires/2024/first-successful-heari.jpg" data-sub-html="Animal handling procedures. (A) Minke whale undergoing an AEP hearing test. The non-inverting electrode and reference electrode are caudal of the blowhole and rostral of the dorsal fin, respectively. The attending veterinarian (C.A. Harms) is pictured collecting a blood sample from the dorsal fin in this image. (B) Post-release view of the dorsal fin鈥搈ounted satellite tag. Credit: <i>Science</i> (2024). DOI: 10.1126/science.ado7580"> <figure class="article-img"> <img src="https://scx1.b-cdn.net/csz/news/800a/2024/first-successful-heari.jpg" alt="First successful hearing test of a wild baleen whale reveals minke whales have ultrasonic hearing" title="Animal handling procedures. (A) Minke whale undergoing an AEP hearing test. The non-inverting electrode and reference electrode are caudal of the blowhole and rostral of the dorsal fin, respectively. The attending veterinarian (C.A. Harms) is pictured collecting a blood sample from the dorsal fin in this image. (B) Post-release view of the dorsal fin鈥搈ounted satellite tag. Credit: Science (2024). DOI: 10.1126/science.ado7580" width="800" height="529"> <figcaption class="text-darken text-low-up text-truncate-js text-truncate mt-3"> Animal handling procedures. (A) Minke whale undergoing an AEP hearing test. The non-inverting electrode and reference electrode are caudal of the blowhole and rostral of the dorsal fin, respectively. The attending veterinarian (C.A. Harms) is pictured collecting a blood sample from the dorsal fin in this image. (B) Post-release view of the dorsal fin鈥搈ounted satellite tag. Credit: <i>Science</i> (2024). DOI: 10.1126/science.ado7580 </figcaption> </figure> </div> </div><p>A team of marine biologists from Norway, the U.S. and Denmark has conducted the first hearing test of a live baleen whale. For their <a href="https://www.science.org/doi/10.1126/science.ado7580" target="_blank">study</a> published in the journal <i>Science</i>, the group corralled a pair of wild minke whales and recorded their brain waves.</p> <div class="article-banner first-banner ads-336x280">  <div id='div-gpt-ad-1449240174198-2'> <script type='text/javascript'> googletag.cmd.push(function() { googletag.display('div-gpt-ad-1449240174198-2'); }); </script> </div> </div> <p>Concerned about how human-produced ocean noises may impact the creatures that live in the sea, <a href="https://phys.org/tags/marine+scientists/" rel="tag" class="textTag">marine scientists</a> want to learn more about the animals' <a href="https://phys.org/tags/hearing/" rel="tag" class="textTag">hearing</a> capabilities. In this new study, the research team devised a means for testing the hearing of two wild baleen whales by recording their <a href="https://phys.org/tags/brain+waves/" rel="tag" class="textTag">brain waves</a> as they listened to recorded sounds.</p> <p>The research team chose the <a href="https://phys.org/tags/minke+whales/" rel="tag" class="textTag">minke whales</a> as test subjects because of their relatively small size compared to other whales. To capture their brain waves, they studied their swimming routes through a narrow channel between two islands off the coast of Norway. Next, they placed netted barriers near the area that directed the whales to a small enclosure.</p> <p>Once they had trapped two whales, they pulled up a net below them, bringing them to the surface. This allowed the researchers to affix electrodes to their heads. The team used the electrodes to record the whales' brain waves as they responded to sounds played from nearby speakers. One of the whales was tested for a half-hour, the other an hour and a half. The researchers then released the whales back into the wild.</p> <p>The brain wave recordings mark the first such successful test of their kind. The research team found that the whales responded to most sounds as had been predicted based on prior research that studied the ear structures of dead whales. They also discovered something unexpected鈥攖he whales were capable of hearing ultrasonic sounds, a finding that suggests all baleen whales may be able to hear such sounds.</p> <p>This means that marine scientists will have to review prior work attempting to understand how whales respond to sonar, underwater echo sounders and other sounds and noises made by ships and seacraft. The finding could also lead to new research on how <a href="https://phys.org/tags/baleen+whales/" rel="tag" class="textTag">baleen whales</a> protect themselves from <a href="https://phys.org/tags/killer+whales/" rel="tag" class="textTag">killer whales</a>.</p> <div class="article-main__more p-4"> <p><strong>More information:</strong> Dorian S. Houser et al, Direct hearing measurements in a baleen whale suggest ultrasonic sensitivity, <i>Science</i> (2024). <a data-doi="1" href="https://dx.doi.org/10.1126/science.ado7580" target="_blank">DOI: 10.1126/science.ado7580</a> <div class="mt-3"> <p> <strong>Journal information:</strong> <a href="https://phys.org/journals/science/"><cite>Science</cite></a> <a class="icon_open" href="http://www.sciencemag.org/" target="_blank" rel="nofollow"> <svg> <use href="https://phys.b-cdn.net/tmpl/v6/img/svg/sprite.svg#icon_open" x="0" y="0"/> </svg> </a> </p> </div> </div> <p class="article-main__note mt-4"> 漏 2024 Science X Network </p>  <div class="d-none d-print-block"> <div class="mb-4"> <strong>Citation</strong>: First successful test of wild minke whales reveals they have ultrasonic hearing (2024, November 23) retrieved 24 November 2024 from https://phys.org/news/2024-11-successful-wild-minke-whales-reveals.html </div> <div class="border text-muted p-3"> This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. 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First successful test of wild minke whales reveals they have ultrasonic hearing