Feeding ecology of larval and juvenile walleye pollock (Theragra chalcogramma) and Pacific cod (Gadus macrocephalus) in the Southeastern Bering Sea
Thesis (M.S.) University of Alaska Fairbanks, 2012 Poor recruitment success during warm years (e.g., 2001-2005) was hypothesized to lead to reduced gadid recruitment in the southeastern Bering Sea. These groundfishes are of particular importance, both commercially and ecologically in the southeaster...
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ftunivalaska:oai:scholarworks.alaska.edu:11122/8420 2023-05-15T15:42:51+02:00 Feeding ecology of larval and juvenile walleye pollock (Theragra chalcogramma) and Pacific cod (Gadus macrocephalus) in the Southeastern Bering Sea Strasburger, Wesley Wayne Hillgruber, Nicola Pinchuk, Alexei Mueter, Franz 2012-08 http://hdl.handle.net/11122/8420 en_US eng http://hdl.handle.net/11122/8420 Graduate Program in Fisheries Division Walleye pollock Food Ecology Bering Sea Pacific cod Larvae Thesis ms 2012 ftunivalaska 2023-02-23T21:37:02Z Thesis (M.S.) University of Alaska Fairbanks, 2012 Poor recruitment success during warm years (e.g., 2001-2005) was hypothesized to lead to reduced gadid recruitment in the southeastern Bering Sea. These groundfishes are of particular importance, both commercially and ecologically in the southeastern Bering Sea. The spatial and temporal overlap of early life stages of walleye pollock and Pacific cod may explain their strongly correlated recruitment trends in the southeastern Bering Sea. The goal of this study was to compare feeding patterns of larval and juvenile walleye pollock (Theragra chalcogramma) and Pacific cod (Gadus macrocephalus) in the southeastern Bering Sea, and to assess the possibility of prey resource competition. Larvae and juveniles from both species collected between May and September 2008, an exceptionally cold year, were used to analyze stomach contents. Fish body size was most consistently related to diet composition within species, however, spatial and depth factors also had an influence. Feeding success and diet composition of these two gadid species were consistently different throughout the spring, summer, and especially fall seasons. Pacific cod larvae and juveniles consistently consumed larger prey items in every season and progressively fewer prey items, especially in the fall. This data suggests that competition for prey resources was unlikely during cold 2008. Thesis Bering Sea Theragra chalcogramma Alaska University of Alaska: ScholarWorks@UA Bering Sea Fairbanks Pacific |
institution |
Open Polar |
collection |
University of Alaska: ScholarWorks@UA |
op_collection_id |
ftunivalaska |
language |
English |
topic |
Walleye pollock Food Ecology Bering Sea Pacific cod Larvae |
spellingShingle |
Walleye pollock Food Ecology Bering Sea Pacific cod Larvae Strasburger, Wesley Wayne Feeding ecology of larval and juvenile walleye pollock (Theragra chalcogramma) and Pacific cod (Gadus macrocephalus) in the Southeastern Bering Sea |
topic_facet |
Walleye pollock Food Ecology Bering Sea Pacific cod Larvae |
description |
Thesis (M.S.) University of Alaska Fairbanks, 2012 Poor recruitment success during warm years (e.g., 2001-2005) was hypothesized to lead to reduced gadid recruitment in the southeastern Bering Sea. These groundfishes are of particular importance, both commercially and ecologically in the southeastern Bering Sea. The spatial and temporal overlap of early life stages of walleye pollock and Pacific cod may explain their strongly correlated recruitment trends in the southeastern Bering Sea. The goal of this study was to compare feeding patterns of larval and juvenile walleye pollock (Theragra chalcogramma) and Pacific cod (Gadus macrocephalus) in the southeastern Bering Sea, and to assess the possibility of prey resource competition. Larvae and juveniles from both species collected between May and September 2008, an exceptionally cold year, were used to analyze stomach contents. Fish body size was most consistently related to diet composition within species, however, spatial and depth factors also had an influence. Feeding success and diet composition of these two gadid species were consistently different throughout the spring, summer, and especially fall seasons. Pacific cod larvae and juveniles consistently consumed larger prey items in every season and progressively fewer prey items, especially in the fall. This data suggests that competition for prey resources was unlikely during cold 2008. |
author2 |
Hillgruber, Nicola Pinchuk, Alexei Mueter, Franz |
format |
Thesis |
author |
Strasburger, Wesley Wayne |
author_facet |
Strasburger, Wesley Wayne |
author_sort |
Strasburger, Wesley Wayne |
title |
Feeding ecology of larval and juvenile walleye pollock (Theragra chalcogramma) and Pacific cod (Gadus macrocephalus) in the Southeastern Bering Sea |
title_short |
Feeding ecology of larval and juvenile walleye pollock (Theragra chalcogramma) and Pacific cod (Gadus macrocephalus) in the Southeastern Bering Sea |
title_full |
Feeding ecology of larval and juvenile walleye pollock (Theragra chalcogramma) and Pacific cod (Gadus macrocephalus) in the Southeastern Bering Sea |
title_fullStr |
Feeding ecology of larval and juvenile walleye pollock (Theragra chalcogramma) and Pacific cod (Gadus macrocephalus) in the Southeastern Bering Sea |
title_full_unstemmed |
Feeding ecology of larval and juvenile walleye pollock (Theragra chalcogramma) and Pacific cod (Gadus macrocephalus) in the Southeastern Bering Sea |
title_sort |
feeding ecology of larval and juvenile walleye pollock (theragra chalcogramma) and pacific cod (gadus macrocephalus) in the southeastern bering sea |
publishDate |
2012 |
url |
http://hdl.handle.net/11122/8420 |
geographic |
Bering Sea Fairbanks Pacific |
geographic_facet |
Bering Sea Fairbanks Pacific |
genre |
Bering Sea Theragra chalcogramma Alaska |
genre_facet |
Bering Sea Theragra chalcogramma Alaska |
op_relation |
http://hdl.handle.net/11122/8420 Graduate Program in Fisheries Division |
_version_ |
1766376816928358400 |