Ecology of small neritic fishes in the western Gulf of Alaska. II. Consumption of krill in relation to krill standing stock and the physical environment
Krill (Euphausiacea) is a patchily distributed taxon whose availability may limit neritic fishes in temperate oceans. In the western Gulf of Alaska, krill-fish aggregations were associated with high-flow areas over the shelf. We examined fish impacts on krill standing stocks in areas of different te...
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ftwilliammarycol:oai:scholarworks.wm.edu:vimsarticles-1137 2023-06-11T04:17:19+02:00 Ecology of small neritic fishes in the western Gulf of Alaska. II. Consumption of krill in relation to krill standing stock and the physical environment Wilson, Matthew T. Jump, Christina M. Buchheister, Andre 2009-01-01T08:00:00Z application/pdf https://scholarworks.wm.edu/vimsarticles/138 doi: 10.3354/meps08237 https://scholarworks.wm.edu/context/vimsarticles/article/1137/viewcontent/m392p239.pdf unknown W&M ScholarWorks https://scholarworks.wm.edu/vimsarticles/138 doi: 10.3354/meps08237 https://scholarworks.wm.edu/context/vimsarticles/article/1137/viewcontent/m392p239.pdf VIMS Articles Walleye pollock Capelin Eulachon Diet Geographic variability Fisheries Science Peer-Reviewed Articles Aquaculture and Fisheries Marine Biology text 2009 ftwilliammarycol https://doi.org/10.3354/meps08237 2023-05-04T17:55:37Z Krill (Euphausiacea) is a patchily distributed taxon whose availability may limit neritic fishes in temperate oceans. In the western Gulf of Alaska, krill-fish aggregations were associated with high-flow areas over the shelf. We examined fish impacts on krill standing stocks in areas of different temperature, salinity, and net current velocity. Samples were collected during September 2000, 2001, and 2003 over a 48-site grid within a known walleye pollock nursery. Krill were a dietary staple of the dominant fishes: walleye pollock Theragra chalcogramma, capelin Mallotus villosus, and eulachon Thaleichthys pacificus, but their proportion in diets varied by predator species and predator length. Predators daily consumed 120 mm) walleye pollock were, on average, large compared to krill in plankton samples; therefore, standing stock sizes might have been overestimated by including small krill. A compensatory response in consumption occurred during 2001 in proximity to the Shelikof sea valley due to increased per capita predation rates and local concentration of Age-1+ walleye pollock and eulachon. High abundance of krill in 2001 was associated with high ocean current flow. No compensatory response was observed where local standing stocks were dominated by small krill. Thus, apparent bottom-up influences of ocean currents on krill abundance in neritic areas can be partly compensated by localized top-down predation from nektonic fishes having prey size preferences that match available prey sizes. Text Theragra chalcogramma Alaska W&M ScholarWorks Gulf of Alaska Marine Ecology Progress Series 392 239 251 |
institution |
Open Polar |
collection |
W&M ScholarWorks |
op_collection_id |
ftwilliammarycol |
language |
unknown |
topic |
Walleye pollock Capelin Eulachon Diet Geographic variability Fisheries Science Peer-Reviewed Articles Aquaculture and Fisheries Marine Biology |
spellingShingle |
Walleye pollock Capelin Eulachon Diet Geographic variability Fisheries Science Peer-Reviewed Articles Aquaculture and Fisheries Marine Biology Wilson, Matthew T. Jump, Christina M. Buchheister, Andre Ecology of small neritic fishes in the western Gulf of Alaska. II. Consumption of krill in relation to krill standing stock and the physical environment |
topic_facet |
Walleye pollock Capelin Eulachon Diet Geographic variability Fisheries Science Peer-Reviewed Articles Aquaculture and Fisheries Marine Biology |
description |
Krill (Euphausiacea) is a patchily distributed taxon whose availability may limit neritic fishes in temperate oceans. In the western Gulf of Alaska, krill-fish aggregations were associated with high-flow areas over the shelf. We examined fish impacts on krill standing stocks in areas of different temperature, salinity, and net current velocity. Samples were collected during September 2000, 2001, and 2003 over a 48-site grid within a known walleye pollock nursery. Krill were a dietary staple of the dominant fishes: walleye pollock Theragra chalcogramma, capelin Mallotus villosus, and eulachon Thaleichthys pacificus, but their proportion in diets varied by predator species and predator length. Predators daily consumed 120 mm) walleye pollock were, on average, large compared to krill in plankton samples; therefore, standing stock sizes might have been overestimated by including small krill. A compensatory response in consumption occurred during 2001 in proximity to the Shelikof sea valley due to increased per capita predation rates and local concentration of Age-1+ walleye pollock and eulachon. High abundance of krill in 2001 was associated with high ocean current flow. No compensatory response was observed where local standing stocks were dominated by small krill. Thus, apparent bottom-up influences of ocean currents on krill abundance in neritic areas can be partly compensated by localized top-down predation from nektonic fishes having prey size preferences that match available prey sizes. |
format |
Text |
author |
Wilson, Matthew T. Jump, Christina M. Buchheister, Andre |
author_facet |
Wilson, Matthew T. Jump, Christina M. Buchheister, Andre |
author_sort |
Wilson, Matthew T. |
title |
Ecology of small neritic fishes in the western Gulf of Alaska. II. Consumption of krill in relation to krill standing stock and the physical environment |
title_short |
Ecology of small neritic fishes in the western Gulf of Alaska. II. Consumption of krill in relation to krill standing stock and the physical environment |
title_full |
Ecology of small neritic fishes in the western Gulf of Alaska. II. Consumption of krill in relation to krill standing stock and the physical environment |
title_fullStr |
Ecology of small neritic fishes in the western Gulf of Alaska. II. Consumption of krill in relation to krill standing stock and the physical environment |
title_full_unstemmed |
Ecology of small neritic fishes in the western Gulf of Alaska. II. Consumption of krill in relation to krill standing stock and the physical environment |
title_sort |
ecology of small neritic fishes in the western gulf of alaska. ii. consumption of krill in relation to krill standing stock and the physical environment |
publisher |
W&M ScholarWorks |
publishDate |
2009 |
url |
https://scholarworks.wm.edu/vimsarticles/138 https://scholarworks.wm.edu/context/vimsarticles/article/1137/viewcontent/m392p239.pdf |
geographic |
Gulf of Alaska |
geographic_facet |
Gulf of Alaska |
genre |
Theragra chalcogramma Alaska |
genre_facet |
Theragra chalcogramma Alaska |
op_source |
VIMS Articles |
op_relation |
https://scholarworks.wm.edu/vimsarticles/138 doi: 10.3354/meps08237 https://scholarworks.wm.edu/context/vimsarticles/article/1137/viewcontent/m392p239.pdf |
op_doi |
https://doi.org/10.3354/meps08237 |
container_title |
Marine Ecology Progress Series |
container_volume |
392 |
container_start_page |
239 |
op_container_end_page |
251 |
_version_ |
1768376385778221056 |