Size‐dependent, Spatial, and Temporal Variability of Juvenile Walleye Pollock ( Theragra chalcogramma) Feeding at a Structural Front in the Southeast Bering Sea
Abstract. The waters surrounding the Pribilof Islands are an important nursery ground for juvenile walleye pollock ( Theragra chalcogramma ), an important forage fish in the pelagic food web of the productive Bering Sea shelf region. The diet of juvenile pollock was studied in two consecutive years...
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crwiley:10.1046/j.1439-0485.2003.03819.x 2024-06-23T07:51:45+00:00 Size‐dependent, Spatial, and Temporal Variability of Juvenile Walleye Pollock ( Theragra chalcogramma) Feeding at a Structural Front in the Southeast Bering Sea Schabetsberger, Robert Sztatecsny, Marc Drozdowski, Gabriele Brodeur, Richard D. Swartzman, Gordon L. Wilson, Matthew T. Winter, Andreas G. Napp, Jeffrey M. 2003 http://dx.doi.org/10.1046/j.1439-0485.2003.03819.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1046%2Fj.1439-0485.2003.03819.x https://onlinelibrary.wiley.com/doi/pdf/10.1046/j.1439-0485.2003.03819.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Marine Ecology volume 24, issue 2, page 141-164 ISSN 0173-9565 1439-0485 journal-article 2003 crwiley https://doi.org/10.1046/j.1439-0485.2003.03819.x 2024-05-31T08:11:53Z Abstract. The waters surrounding the Pribilof Islands are an important nursery ground for juvenile walleye pollock ( Theragra chalcogramma ), an important forage fish in the pelagic food web of the productive Bering Sea shelf region. The diet of juvenile pollock was studied in two consecutive years along a transect line crossing from a well‐mixed coastal domain, through a frontal region to stratified water farther offshore. Variability in stomach fullness was high and evidence for increased feeding intensity in the front was weak. Prey diversity and prey size generally increased with increasing fish size, shifting from predominantly small copepods to larger, more evasive prey items such as euphausiids, crab megalopae and fish. The diet of the fish reflected changes in the relative abundance of copepods and euphausiids in the prey fields between years. Juvenile pollock showed increased feeding rates at dusk, and stomach fullness as well as prey condition were generally lowest just before sunrise; however, the proportion of euphausiids increased in the diet of pollock caught at night, suggesting that some food was also ingested during darkness. Juvenile pollock and their euphausiid prey both vertically migrated above the thermocline at night, although each had a different daytime depth. Article in Journal/Newspaper Bering Sea Theragra chalcogramma Copepods Wiley Online Library Bering Sea Marine Ecology 24 2 141 164 |
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Open Polar |
collection |
Wiley Online Library |
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crwiley |
language |
English |
description |
Abstract. The waters surrounding the Pribilof Islands are an important nursery ground for juvenile walleye pollock ( Theragra chalcogramma ), an important forage fish in the pelagic food web of the productive Bering Sea shelf region. The diet of juvenile pollock was studied in two consecutive years along a transect line crossing from a well‐mixed coastal domain, through a frontal region to stratified water farther offshore. Variability in stomach fullness was high and evidence for increased feeding intensity in the front was weak. Prey diversity and prey size generally increased with increasing fish size, shifting from predominantly small copepods to larger, more evasive prey items such as euphausiids, crab megalopae and fish. The diet of the fish reflected changes in the relative abundance of copepods and euphausiids in the prey fields between years. Juvenile pollock showed increased feeding rates at dusk, and stomach fullness as well as prey condition were generally lowest just before sunrise; however, the proportion of euphausiids increased in the diet of pollock caught at night, suggesting that some food was also ingested during darkness. Juvenile pollock and their euphausiid prey both vertically migrated above the thermocline at night, although each had a different daytime depth. |
format |
Article in Journal/Newspaper |
author |
Schabetsberger, Robert Sztatecsny, Marc Drozdowski, Gabriele Brodeur, Richard D. Swartzman, Gordon L. Wilson, Matthew T. Winter, Andreas G. Napp, Jeffrey M. |
spellingShingle |
Schabetsberger, Robert Sztatecsny, Marc Drozdowski, Gabriele Brodeur, Richard D. Swartzman, Gordon L. Wilson, Matthew T. Winter, Andreas G. Napp, Jeffrey M. Size‐dependent, Spatial, and Temporal Variability of Juvenile Walleye Pollock ( Theragra chalcogramma) Feeding at a Structural Front in the Southeast Bering Sea |
author_facet |
Schabetsberger, Robert Sztatecsny, Marc Drozdowski, Gabriele Brodeur, Richard D. Swartzman, Gordon L. Wilson, Matthew T. Winter, Andreas G. Napp, Jeffrey M. |
author_sort |
Schabetsberger, Robert |
title |
Size‐dependent, Spatial, and Temporal Variability of Juvenile Walleye Pollock ( Theragra chalcogramma) Feeding at a Structural Front in the Southeast Bering Sea |
title_short |
Size‐dependent, Spatial, and Temporal Variability of Juvenile Walleye Pollock ( Theragra chalcogramma) Feeding at a Structural Front in the Southeast Bering Sea |
title_full |
Size‐dependent, Spatial, and Temporal Variability of Juvenile Walleye Pollock ( Theragra chalcogramma) Feeding at a Structural Front in the Southeast Bering Sea |
title_fullStr |
Size‐dependent, Spatial, and Temporal Variability of Juvenile Walleye Pollock ( Theragra chalcogramma) Feeding at a Structural Front in the Southeast Bering Sea |
title_full_unstemmed |
Size‐dependent, Spatial, and Temporal Variability of Juvenile Walleye Pollock ( Theragra chalcogramma) Feeding at a Structural Front in the Southeast Bering Sea |
title_sort |
size‐dependent, spatial, and temporal variability of juvenile walleye pollock ( theragra chalcogramma) feeding at a structural front in the southeast bering sea |
publisher |
Wiley |
publishDate |
2003 |
url |
http://dx.doi.org/10.1046/j.1439-0485.2003.03819.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1046%2Fj.1439-0485.2003.03819.x https://onlinelibrary.wiley.com/doi/pdf/10.1046/j.1439-0485.2003.03819.x |
geographic |
Bering Sea |
geographic_facet |
Bering Sea |
genre |
Bering Sea Theragra chalcogramma Copepods |
genre_facet |
Bering Sea Theragra chalcogramma Copepods |
op_source |
Marine Ecology volume 24, issue 2, page 141-164 ISSN 0173-9565 1439-0485 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1046/j.1439-0485.2003.03819.x |
container_title |
Marine Ecology |
container_volume |
24 |
container_issue |
2 |
container_start_page |
141 |
op_container_end_page |
164 |
_version_ |
1802642878018617344 |