<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<meta name="Generator" content="Microsoft Word 15 (filtered medium)">
<!--[if !mso]><style>v\:* {behavior:url(#default#VML);}
o\:* {behavior:url(#default#VML);}
w\:* {behavior:url(#default#VML);}
.shape {behavior:url(#default#VML);}
</style><![endif]--><style><!--
/* Font Definitions */
@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
@font-face
{font-family:"Century Gothic";
panose-1:2 11 5 2 2 2 2 2 2 4;}
@font-face
{font-family:"Avenir Book";}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri",sans-serif;}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:#0563C1;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:#954F72;
text-decoration:underline;}
span.EmailStyle17
{mso-style-type:personal-compose;
font-family:"Calibri",sans-serif;
color:windowtext;}
.MsoChpDefault
{mso-style-type:export-only;
font-family:"Calibri",sans-serif;}
@page WordSection1
{size:8.5in 11.0in;
margin:1.0in 1.0in 1.0in 1.0in;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]-->
</head>
<body lang="EN-US" link="#0563C1" vlink="#954F72">
<div class="WordSection1">
<p class="MsoNormal"><span style="font-size:10.5pt;color:#3C4043">Woods Hole Oceanographic Institution<br>
Biology Department Seminar<br>
Thursday, September 28, 2023 – 12:00 Noon <br>
<br>
<b>Robert Levine</b><br>
Research Physical Scientist, NOAA Alaska Fisheries Science Center<br>
<br>
<b>Climate-Driven Shifts in Abundance, Distribution, and Composition of the Pelagic Fish Community in a Rapidly Changing Pacific Arctic </b><br>
Age-0 Arctic cod (<i>Boreogadus saida</i>) have historically dominated the pelagic fish community in the Chukchi Sea in summer, with few adults present in the region. Recent reductions in sea ice and increases in warming and transport have led to an increase
in Pacific-origin waters on the Chukchi shelf in summer. To examine the potential effects of these environmental changes on the pelagic community, we conducted autonomous and ship-based surveys in summer 2017, 2018, and 2019. Throughout this period, bottom-moored
echosounders continuously measured fish abundance and movement at several locations. Together, these observations indicate that the abundance and composition of the pelagic community on the Chukchi Sea shelf are highly variable over seasonal and annual time
scales. Summer surveys found that age-0 Arctic cod were the most abundant pelagic fish in all four survey years. Age-0 walleye pollock (<i>Gadus chalcogrammus</i>), which were scarce and confined to the southern Chukchi in previous years, were present in high
abundance throughout the Chukchi shelf in 2017 and 2019. We hypothesize that the changes in abundance and species composition are tightly coupled to recent changes in temperature and the transport of Bering Sea waters onto the Chukchi shelf. The substantial
increase in age-0 pollock in recent years suggests that environmental conditions now allow this species to extend its northern range into the central and southern Chukchi Sea, at least on a seasonal basis. Seasonally, fish abundance was very low in winter,
increased in May, and reached peak abundance in late summer. Age-0 gadids were displaced to the northeast, consistent with the dominant advection on the shelf. Fish speeds and headings were strongly correlated with local currents, providing evidence that behavior
plays a limited role in the displacements of these populations.<br>
<br>
VIRTUAL ONLY! Zoom: </span><a href="https://nam02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.google.com%2Furl%3Fq%3Dhttps%3A%2F%2Fwhoi-edu.zoom.us%2Fj%2F95825629706%26sa%3DD%26source%3Dcalendar%26ust%3D1696166176595947%26usg%3DAOvVaw0pfJwO7YpnrO_na_xn3Xc2&data=05%7C01%7Call-postdocs%40whoi.edu%7Ca868f7f43abb4b8f639708dbbe9308df%7Cd44c5cc6d18c46cc8abd4fdf5b6e5944%7C0%7C0%7C638313311239813546%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=%2B21COJgKLr1NPwUOmJEfIbOv8YwabPoMpbDpg8tZiYg%3D&reserved=0" originalsrc="https://www.google.com/url?q=https://whoi-edu.zoom.us/j/95825629706&sa=D&source=calendar&ust=1696166176595947&usg=AOvVaw0pfJwO7YpnrO_na_xn3Xc2" shash="u96u+pyy8E50jNJ9Eh6ME+6MqVy1PbEWZuHSJEEOrEm1KGon5v/EnYlmZaEfU/c/Px47TspPVPED0pjIgnK+C3d9ps/LfblsbcCo6nWbgS5AshMDuILwITHQGkqO5cuIB2WS0VHJbZBqMz9/L0jo3mb2Lph8jDUxElwqgPiQ5pQ="><span style="font-size:10.5pt;color:blue">https://whoi-edu.zoom.us/j/95825629706</span></a><span style="font-size:10.5pt;color:#3C4043"> Meeting
ID: 958 2562 9706 By phone: Find your local number: </span><a href="https://nam02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.google.com%2Furl%3Fq%3Dhttps%3A%2F%2Fwhoi-edu.zoom.us%2Fu%2FaKkOljZ4T%26sa%3DD%26source%3Dcalendar%26ust%3D1696166176595947%26usg%3DAOvVaw3t-HjBA2m2g6qoQNuELmD3&data=05%7C01%7Call-postdocs%40whoi.edu%7Ca868f7f43abb4b8f639708dbbe9308df%7Cd44c5cc6d18c46cc8abd4fdf5b6e5944%7C0%7C0%7C638313311239813546%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=%2FWZiTiopv5pbvyW%2BeUnUtNLuNao5FCXY3ejTmLztd5w%3D&reserved=0" originalsrc="https://www.google.com/url?q=https://whoi-edu.zoom.us/u/aKkOljZ4T&sa=D&source=calendar&ust=1696166176595947&usg=AOvVaw3t-HjBA2m2g6qoQNuELmD3" shash="QexyxWJ2a0WmTX0eWefCNPioiWhRI69nQQ+DuzXraGCDI8D+AmJmeYaDT9zFRncelTj66/9+/GyzE+M3h4PR79YlcMc+I9P8r3JNTZb6j8gu4JN55uVQGeJxFuqfmjuUikTaBVMftyX7ACA1O9hfQY4doKub/kGbbhn5zmEIGl4="><span style="font-size:10.5pt;color:blue">https://whoi-edu.zoom.us/u/aKkOljZ4T</span></a><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">For questions, contact:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Century Gothic",sans-serif;color:#4472C4">Ana María Vélez</span></b><span style="font-size:10.0pt;font-family:"Century Gothic",sans-serif;color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Century Gothic",sans-serif;color:black">Administrative Associate<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Avenir Book";color:black"><img border="0" width="304" height="20" style="width:3.1666in;height:.2083in" id="Picture_x0020_1" src="cid:image003.png@01D9F05A.5D248E60" alt="signature_1005462319"></span><span style="font-size:10.0pt;color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Century Gothic",sans-serif;color:black">O: 508.289.2334<o:p></o:p></span></p>
<p class="MsoNormal"><i><span style="font-size:9.0pt;font-family:"Century Gothic",sans-serif;color:black">She/her</span></i><span style="font-size:9.0pt;font-family:"Century Gothic",sans-serif;color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
</body>
</html>