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<p class="MsoNormal" style="margin-bottom:12.0pt"><span style="font-size:10.5pt;color:#3C4043">Woods Hole Oceanographic Institution<br>
Biology Department Seminar<br>
Thursday, December 15, 2022 – 12:00 Noon</span><o:p></o:p></p>
<p class="MsoNormal"><b><span style="font-size:10.5pt;color:#3C4043">Johanna Weston</span></b><span style="font-size:10.5pt;color:#3C4043"><br>
Postdoc Scholar, WHOI Biology Department</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:10.5pt;color:#3C4043"> </span><o:p></o:p></p>
<p class="MsoNormal"><b><span style="font-size:10.5pt;color:#3C4043">What Amphipods Teach Us About Our Ocean’s Deepest Zone</span></b><span style="font-size:10.5pt;color:#3C4043"><br>
As the ocean’s deepest zone, the hadal zone is an enigmatic cluster of subduction trenches, troughs, fracture zones, and trench faults that plunge to depths of 6 to ~11 km. These features disrupt the topographic continuum of the shallower abyssal zone, creating
isolated pockets of hadal habitats. High hydrostatic pressure, near-freezing temperatures, food scarcity, and geologic instability limit these environments to just a few “extremophile” organisms. The crustacean order Amphipoda is one of the most widely spread
taxa at hadal depths, with species present at full ocean depth, and can be readily brought to the surface using baited landers. Thus, amphipods are a valuable model for hadal ecology and evolution. In this seminar, I will focus on advances in hadal amphipod
research, including: 1) an expansion of the described diversity through integrative taxonomy, 2) the sampling beyond subduction trenches to examine how the community dynamics are shaped by the topography of a non-subduction feature, and 3) that population
genomics is showing that populations of the globally distributed amphipod, <i>Bathycallisoma schellenbergi</i>, are highly restricted to their individual feature. Further, amphipods show signs of human impact and highlight that the remoteness of the hadal
zone does not protect these ecosystems from activities at the surface and on land. Together, research with amphipods is illuminating the interplay between speciation and tectonic-driven isolation across the deepest depths of the oceans and allows us to gain
insights toward conserving these habitats.</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:10.5pt;color:#3C4043"><br>
HYBRID! <b>In person</b>: Redfield Auditorium <b>Zoom</b>: <a href="https://whoi-edu.zoom.us/j/99543543677"><span style="color:blue">https://whoi-edu.zoom.us/j/99543543677</span></a> Meeting ID: 995 4354 3677 <b>By phone</b>: Find your local number: <a href="https://whoi-edu.zoom.us/u/adPLxW4SiV"><span style="color:blue">https://whoi-edu.zoom.us/u/adPLxW4SiV</span></a></span><o:p></o:p></p>
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