Autonomous vehicle surveys indicate that flow reversals retain juvenile fishes in a highly advective high‐latitude ecosystem
Abstract Summer surveys of the Chukchi Sea indicate that high densities of age‐0 gadid fishes, historically Arctic cod ( Boreogadus saida ) but recently also walleye pollock ( Gadus chalcogrammus ), dominate the pelagic fish community. Adults are comparatively scarce, suggesting that either overwint...
Published in: | Limnology and Oceanography |
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crwiley:10.1002/lno.11671 2024-09-15T17:52:28+00:00 Autonomous vehicle surveys indicate that flow reversals retain juvenile fishes in a highly advective high‐latitude ecosystem Levine, Robert M. De Robertis, Alex Grünbaum, Daniel Woodgate, Rebecca Mordy, Calvin W. Mueter, Franz Cokelet, Edward Lawrence‐Slavas, Noah Tabisola, Heather Joint Institute for the Study of the Atmosphere and Ocean North Pacific Research Board 2020 http://dx.doi.org/10.1002/lno.11671 https://onlinelibrary.wiley.com/doi/pdf/10.1002/lno.11671 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/lno.11671 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.1002/lno.11671 en eng Wiley http://creativecommons.org/licenses/by/4.0/ Limnology and Oceanography volume 66, issue 4, page 1139-1154 ISSN 0024-3590 1939-5590 journal-article 2020 crwiley https://doi.org/10.1002/lno.11671 2024-08-22T04:17:20Z Abstract Summer surveys of the Chukchi Sea indicate that high densities of age‐0 gadid fishes, historically Arctic cod ( Boreogadus saida ) but recently also walleye pollock ( Gadus chalcogrammus ), dominate the pelagic fish community. Adults are comparatively scarce, suggesting that either overwinter survivorship of age‐0 gadids is low, or that they emigrate to other areas of the Pacific Arctic. To examine population movement, we conducted repeat acoustic surveys with saildrone autonomous surface vehicles equipped with echosounders throughout summer 2018. The saildrones' range and endurance enabled two large‐scale surveys of the U.S. Chukchi shelf. Acoustic backscatter, a proxy for fish density, was highest in regions with sea surface temperatures of 6–8°C, and lowest in areas influenced by recent ice melt. A subarea of the central Chukchi was surveyed a total of four times; backscatter in this subarea increased by > 85% from late‐July to mid‐September. As summer progressed, fish developed more extensive diel vertical migrations and backscatter from individuals doubled. Both changes suggest increases in backscatter were driven primarily by increasing body size. Particle tracking simulations indicated age‐0 gadids were likely retained over the Chukchi shelf by extended periods of wind‐driven southward flow during the survey period before strong northward flow in late fall transported them to the north. These findings suggest that in summer 2018, age‐0 gadids were advected northward to the Chukchi shelf from the northern Bering Sea, where they were retained during a period of growth until late fall before being advected farther north toward the Chukchi and Beaufort shelf breaks. Article in Journal/Newspaper Arctic cod Bering Sea Boreogadus saida Chukchi Chukchi Sea Pacific Arctic Wiley Online Library Limnology and Oceanography 66 4 1139 1154 |
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Wiley Online Library |
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English |
description |
Abstract Summer surveys of the Chukchi Sea indicate that high densities of age‐0 gadid fishes, historically Arctic cod ( Boreogadus saida ) but recently also walleye pollock ( Gadus chalcogrammus ), dominate the pelagic fish community. Adults are comparatively scarce, suggesting that either overwinter survivorship of age‐0 gadids is low, or that they emigrate to other areas of the Pacific Arctic. To examine population movement, we conducted repeat acoustic surveys with saildrone autonomous surface vehicles equipped with echosounders throughout summer 2018. The saildrones' range and endurance enabled two large‐scale surveys of the U.S. Chukchi shelf. Acoustic backscatter, a proxy for fish density, was highest in regions with sea surface temperatures of 6–8°C, and lowest in areas influenced by recent ice melt. A subarea of the central Chukchi was surveyed a total of four times; backscatter in this subarea increased by > 85% from late‐July to mid‐September. As summer progressed, fish developed more extensive diel vertical migrations and backscatter from individuals doubled. Both changes suggest increases in backscatter were driven primarily by increasing body size. Particle tracking simulations indicated age‐0 gadids were likely retained over the Chukchi shelf by extended periods of wind‐driven southward flow during the survey period before strong northward flow in late fall transported them to the north. These findings suggest that in summer 2018, age‐0 gadids were advected northward to the Chukchi shelf from the northern Bering Sea, where they were retained during a period of growth until late fall before being advected farther north toward the Chukchi and Beaufort shelf breaks. |
author2 |
Joint Institute for the Study of the Atmosphere and Ocean North Pacific Research Board |
format |
Article in Journal/Newspaper |
author |
Levine, Robert M. De Robertis, Alex Grünbaum, Daniel Woodgate, Rebecca Mordy, Calvin W. Mueter, Franz Cokelet, Edward Lawrence‐Slavas, Noah Tabisola, Heather |
spellingShingle |
Levine, Robert M. De Robertis, Alex Grünbaum, Daniel Woodgate, Rebecca Mordy, Calvin W. Mueter, Franz Cokelet, Edward Lawrence‐Slavas, Noah Tabisola, Heather Autonomous vehicle surveys indicate that flow reversals retain juvenile fishes in a highly advective high‐latitude ecosystem |
author_facet |
Levine, Robert M. De Robertis, Alex Grünbaum, Daniel Woodgate, Rebecca Mordy, Calvin W. Mueter, Franz Cokelet, Edward Lawrence‐Slavas, Noah Tabisola, Heather |
author_sort |
Levine, Robert M. |
title |
Autonomous vehicle surveys indicate that flow reversals retain juvenile fishes in a highly advective high‐latitude ecosystem |
title_short |
Autonomous vehicle surveys indicate that flow reversals retain juvenile fishes in a highly advective high‐latitude ecosystem |
title_full |
Autonomous vehicle surveys indicate that flow reversals retain juvenile fishes in a highly advective high‐latitude ecosystem |
title_fullStr |
Autonomous vehicle surveys indicate that flow reversals retain juvenile fishes in a highly advective high‐latitude ecosystem |
title_full_unstemmed |
Autonomous vehicle surveys indicate that flow reversals retain juvenile fishes in a highly advective high‐latitude ecosystem |
title_sort |
autonomous vehicle surveys indicate that flow reversals retain juvenile fishes in a highly advective high‐latitude ecosystem |
publisher |
Wiley |
publishDate |
2020 |
url |
http://dx.doi.org/10.1002/lno.11671 https://onlinelibrary.wiley.com/doi/pdf/10.1002/lno.11671 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/lno.11671 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.1002/lno.11671 |
genre |
Arctic cod Bering Sea Boreogadus saida Chukchi Chukchi Sea Pacific Arctic |
genre_facet |
Arctic cod Bering Sea Boreogadus saida Chukchi Chukchi Sea Pacific Arctic |
op_source |
Limnology and Oceanography volume 66, issue 4, page 1139-1154 ISSN 0024-3590 1939-5590 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1002/lno.11671 |
container_title |
Limnology and Oceanography |
container_volume |
66 |
container_issue |
4 |
container_start_page |
1139 |
op_container_end_page |
1154 |
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1810294495533596672 |