Seasonal shifts in feeding patterns: Individual and population realized specialization in a high Arctic fish
Abstract Species with a broad and flexible diet may be at an advantage in a rapidly changing environment such as in today's Arctic ecosystems. Polar cod ( Boreogadus saida ), an abundant and ecologically important circumpolar Arctic fish, is often described as a zooplankton generalist feeder, w...
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crwiley:10.1002/ece3.5615 2024-09-15T18:00:11+00:00 Seasonal shifts in feeding patterns: Individual and population realized specialization in a high Arctic fish Cusa, Marine Berge, Jørgen Varpe, Øystein Norges Forskningsråd 2019 http://dx.doi.org/10.1002/ece3.5615 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ece3.5615 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/ece3.5615 en eng Wiley http://creativecommons.org/licenses/by/4.0/ Ecology and Evolution volume 9, issue 19, page 11112-11121 ISSN 2045-7758 2045-7758 journal-article 2019 crwiley https://doi.org/10.1002/ece3.5615 2024-08-13T04:15:53Z Abstract Species with a broad and flexible diet may be at an advantage in a rapidly changing environment such as in today's Arctic ecosystems. Polar cod ( Boreogadus saida ), an abundant and ecologically important circumpolar Arctic fish, is often described as a zooplankton generalist feeder, which suggests that it may cope successfully with changes in prey composition. This description is justified based on the relatively broad diet of polar cod across sites and seasons. In this case study, we used polar cod dietary data from fall and winter and from two distinct environments, dominated either by Arctic or Atlantic water masses in Svalbard. Our results point to the importance of time and space when drawing conclusions on dietary plasticity and degree of specialization. Polar cod diet differed significantly between fall and the winter and between Arctic and Atlantic domains. Polar cod from Arctic domains displayed a strong realized population specialization on Themisto libellula in fall, and the larger dietary niche width observed in the winter was the product of realized individual specialization, with increased feeding on fish prey. Overall, we did not observe a generalized feeding behavior. If dietary niche width is to inform conservation management, we argue it must be recognized that populations from a single species may adopt seasonally contrasting degrees of dietary specialization and that these populations may differ in their vulnerability to climate‐induced changes in prey community composition. Article in Journal/Newspaper Boreogadus saida polar cod Svalbard Themisto Themisto libellula Zooplankton Wiley Online Library Ecology and Evolution 9 19 11112 11121 |
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Wiley Online Library |
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crwiley |
language |
English |
description |
Abstract Species with a broad and flexible diet may be at an advantage in a rapidly changing environment such as in today's Arctic ecosystems. Polar cod ( Boreogadus saida ), an abundant and ecologically important circumpolar Arctic fish, is often described as a zooplankton generalist feeder, which suggests that it may cope successfully with changes in prey composition. This description is justified based on the relatively broad diet of polar cod across sites and seasons. In this case study, we used polar cod dietary data from fall and winter and from two distinct environments, dominated either by Arctic or Atlantic water masses in Svalbard. Our results point to the importance of time and space when drawing conclusions on dietary plasticity and degree of specialization. Polar cod diet differed significantly between fall and the winter and between Arctic and Atlantic domains. Polar cod from Arctic domains displayed a strong realized population specialization on Themisto libellula in fall, and the larger dietary niche width observed in the winter was the product of realized individual specialization, with increased feeding on fish prey. Overall, we did not observe a generalized feeding behavior. If dietary niche width is to inform conservation management, we argue it must be recognized that populations from a single species may adopt seasonally contrasting degrees of dietary specialization and that these populations may differ in their vulnerability to climate‐induced changes in prey community composition. |
author2 |
Norges Forskningsråd |
format |
Article in Journal/Newspaper |
author |
Cusa, Marine Berge, Jørgen Varpe, Øystein |
spellingShingle |
Cusa, Marine Berge, Jørgen Varpe, Øystein Seasonal shifts in feeding patterns: Individual and population realized specialization in a high Arctic fish |
author_facet |
Cusa, Marine Berge, Jørgen Varpe, Øystein |
author_sort |
Cusa, Marine |
title |
Seasonal shifts in feeding patterns: Individual and population realized specialization in a high Arctic fish |
title_short |
Seasonal shifts in feeding patterns: Individual and population realized specialization in a high Arctic fish |
title_full |
Seasonal shifts in feeding patterns: Individual and population realized specialization in a high Arctic fish |
title_fullStr |
Seasonal shifts in feeding patterns: Individual and population realized specialization in a high Arctic fish |
title_full_unstemmed |
Seasonal shifts in feeding patterns: Individual and population realized specialization in a high Arctic fish |
title_sort |
seasonal shifts in feeding patterns: individual and population realized specialization in a high arctic fish |
publisher |
Wiley |
publishDate |
2019 |
url |
http://dx.doi.org/10.1002/ece3.5615 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ece3.5615 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/ece3.5615 |
genre |
Boreogadus saida polar cod Svalbard Themisto Themisto libellula Zooplankton |
genre_facet |
Boreogadus saida polar cod Svalbard Themisto Themisto libellula Zooplankton |
op_source |
Ecology and Evolution volume 9, issue 19, page 11112-11121 ISSN 2045-7758 2045-7758 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1002/ece3.5615 |
container_title |
Ecology and Evolution |
container_volume |
9 |
container_issue |
19 |
container_start_page |
11112 |
op_container_end_page |
11121 |
_version_ |
1810437350443974656 |