The influence of pelagic habitat selection and interspecific competition on productivity of juvenile walleye pollock ( Theragra chalcogramma) and capelin ( Mallotus villosus) in the Gulf of Alaska
Abstract Here we investigate processes affecting productivity of capelin and walleye pollock in the Gulf of Alaska. We examine pelagic habitat selection by comparing the distribution of juvenile fish and their prey with oceanographic properties and we evaluate the potential for interspecific competi...
Published in: | Fisheries Oceanography |
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Online Access: | http://dx.doi.org/10.1111/j.1365-2419.2010.00542.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1365-2419.2010.00542.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1365-2419.2010.00542.x |
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crwiley:10.1111/j.1365-2419.2010.00542.x 2024-06-02T08:09:55+00:00 The influence of pelagic habitat selection and interspecific competition on productivity of juvenile walleye pollock ( Theragra chalcogramma) and capelin ( Mallotus villosus) in the Gulf of Alaska LOGERWELL, ELIZABETH A. DUFFY‐ANDERSON, JANET WILSON, MATTHEW MCKELVEY, DENISE 2010 http://dx.doi.org/10.1111/j.1365-2419.2010.00542.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1365-2419.2010.00542.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1365-2419.2010.00542.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Fisheries Oceanography volume 19, issue 4, page 262-278 ISSN 1054-6006 1365-2419 journal-article 2010 crwiley https://doi.org/10.1111/j.1365-2419.2010.00542.x 2024-05-03T11:54:08Z Abstract Here we investigate processes affecting productivity of capelin and walleye pollock in the Gulf of Alaska. We examine pelagic habitat selection by comparing the distribution of juvenile fish and their prey with oceanographic properties and we evaluate the potential for interspecific competition by comparing diets and measures of foraging. The primary field study was conducted in Barnabus Trough, Kodiak Island, Alaska, during September 2005. The distribution of fish was assessed acoustically and trawls were used to collect individual fish for stomach content analyses. Physical and biological data were collected with conductivity–temperature–depth probes and zooplankton tows. Age‐0 pollock were distributed in cool waters offshore of a mid‐trough front, coincident with the distribution of euphausiids, their preferred prey. In contrast, capelin and their prey (copepods) were distributed throughout the trough. We observed that sympatric capelin (occurring with pollock) often had reduced foraging success compared to allopatric capelin (occurring alone). Results of a bioenergetic model also suggest that the exclusion of capelin from foraging on euphausiids can have negative consequences for capelin growth. Article in Journal/Newspaper Kodiak Theragra chalcogramma Alaska Copepods Wiley Online Library Gulf of Alaska Fisheries Oceanography 19 4 262 278 |
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Open Polar |
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Wiley Online Library |
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crwiley |
language |
English |
description |
Abstract Here we investigate processes affecting productivity of capelin and walleye pollock in the Gulf of Alaska. We examine pelagic habitat selection by comparing the distribution of juvenile fish and their prey with oceanographic properties and we evaluate the potential for interspecific competition by comparing diets and measures of foraging. The primary field study was conducted in Barnabus Trough, Kodiak Island, Alaska, during September 2005. The distribution of fish was assessed acoustically and trawls were used to collect individual fish for stomach content analyses. Physical and biological data were collected with conductivity–temperature–depth probes and zooplankton tows. Age‐0 pollock were distributed in cool waters offshore of a mid‐trough front, coincident with the distribution of euphausiids, their preferred prey. In contrast, capelin and their prey (copepods) were distributed throughout the trough. We observed that sympatric capelin (occurring with pollock) often had reduced foraging success compared to allopatric capelin (occurring alone). Results of a bioenergetic model also suggest that the exclusion of capelin from foraging on euphausiids can have negative consequences for capelin growth. |
format |
Article in Journal/Newspaper |
author |
LOGERWELL, ELIZABETH A. DUFFY‐ANDERSON, JANET WILSON, MATTHEW MCKELVEY, DENISE |
spellingShingle |
LOGERWELL, ELIZABETH A. DUFFY‐ANDERSON, JANET WILSON, MATTHEW MCKELVEY, DENISE The influence of pelagic habitat selection and interspecific competition on productivity of juvenile walleye pollock ( Theragra chalcogramma) and capelin ( Mallotus villosus) in the Gulf of Alaska |
author_facet |
LOGERWELL, ELIZABETH A. DUFFY‐ANDERSON, JANET WILSON, MATTHEW MCKELVEY, DENISE |
author_sort |
LOGERWELL, ELIZABETH A. |
title |
The influence of pelagic habitat selection and interspecific competition on productivity of juvenile walleye pollock ( Theragra chalcogramma) and capelin ( Mallotus villosus) in the Gulf of Alaska |
title_short |
The influence of pelagic habitat selection and interspecific competition on productivity of juvenile walleye pollock ( Theragra chalcogramma) and capelin ( Mallotus villosus) in the Gulf of Alaska |
title_full |
The influence of pelagic habitat selection and interspecific competition on productivity of juvenile walleye pollock ( Theragra chalcogramma) and capelin ( Mallotus villosus) in the Gulf of Alaska |
title_fullStr |
The influence of pelagic habitat selection and interspecific competition on productivity of juvenile walleye pollock ( Theragra chalcogramma) and capelin ( Mallotus villosus) in the Gulf of Alaska |
title_full_unstemmed |
The influence of pelagic habitat selection and interspecific competition on productivity of juvenile walleye pollock ( Theragra chalcogramma) and capelin ( Mallotus villosus) in the Gulf of Alaska |
title_sort |
influence of pelagic habitat selection and interspecific competition on productivity of juvenile walleye pollock ( theragra chalcogramma) and capelin ( mallotus villosus) in the gulf of alaska |
publisher |
Wiley |
publishDate |
2010 |
url |
http://dx.doi.org/10.1111/j.1365-2419.2010.00542.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1365-2419.2010.00542.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1365-2419.2010.00542.x |
geographic |
Gulf of Alaska |
geographic_facet |
Gulf of Alaska |
genre |
Kodiak Theragra chalcogramma Alaska Copepods |
genre_facet |
Kodiak Theragra chalcogramma Alaska Copepods |
op_source |
Fisheries Oceanography volume 19, issue 4, page 262-278 ISSN 1054-6006 1365-2419 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1365-2419.2010.00542.x |
container_title |
Fisheries Oceanography |
container_volume |
19 |
container_issue |
4 |
container_start_page |
262 |
op_container_end_page |
278 |
_version_ |
1800755704726814720 |