Intra‐annual variation in feeding of Atlantic cod <scp> Gadus morhua </scp>: the importance of ephemeral prey bursts
Abstract Seasonal prey bursts are important for the life cycles and energy budgets of many predators. This study documents the diet and, especially, the importance of the ephemeral occurrence of capelin as prey for Atlantic cod ( Gadus morhua ) in Godthaabsfjord, west Greenland, over an annual cycle...
Published in: | Journal of Fish Biology |
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Online Access: | http://dx.doi.org/10.1111/jfb.14520 https://onlinelibrary.wiley.com/doi/pdf/10.1111/jfb.14520 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/jfb.14520 |
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crwiley:10.1111/jfb.14520 2023-12-03T10:18:56+01:00 Intra‐annual variation in feeding of Atlantic cod <scp> Gadus morhua </scp>: the importance of ephemeral prey bursts Grønkjær, Peter Ottosen, Rasmus Joensen, Thor Reeve, Lee Nielsen, Einar E. Hedeholm, Rasmus Danish Agency for Science and Higher Education 2020 http://dx.doi.org/10.1111/jfb.14520 https://onlinelibrary.wiley.com/doi/pdf/10.1111/jfb.14520 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/jfb.14520 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Fish Biology volume 97, issue 5, page 1507-1519 ISSN 0022-1112 1095-8649 Aquatic Science Ecology, Evolution, Behavior and Systematics journal-article 2020 crwiley https://doi.org/10.1111/jfb.14520 2023-11-09T14:24:52Z Abstract Seasonal prey bursts are important for the life cycles and energy budgets of many predators. This study documents the diet and, especially, the importance of the ephemeral occurrence of capelin as prey for Atlantic cod ( Gadus morhua ) in Godthaabsfjord, west Greenland, over an annual cycle. The cod showed clear differences in diet composition on the 11 sampling dates resulting in a spring–summer, late summer–autumn and winter cluster. Moreover, a single sampling date, 12 May, was defined by cod gorge feeding on spawning capelin, which led to average stomach contents 4.3 times higher than the average for the remaining sampling dates. Changes in nitrogen stable isotope values from 22 April to 7 July in cod liver and muscle tissue were used to calculate the consumption of capelin. Based on this, the consumption of capelin varied between 538 and 658 g wet weight for a 1.3 kg cod. Using published consumption/biomass estimates and observed growth rates, the capelin intake corresponds to 10.1%–33.3% of the annual food consumption and accounts for 28.1%–34.5% of the annual growth of the cod. The present study documents the omnivorous feeding mode of Atlantic cod but highlights the utilization and importance of ephemeral prey bursts for the annual energy budget of the cod. It is hypothesized that access to capelin is critical for the postspawning recovery of Godthaabsfjord cod. Article in Journal/Newspaper atlantic cod Gadus morhua Greenland Wiley Online Library (via Crossref) Greenland Journal of Fish Biology 97 5 1507 1519 |
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Open Polar |
collection |
Wiley Online Library (via Crossref) |
op_collection_id |
crwiley |
language |
English |
topic |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Aquatic Science Ecology, Evolution, Behavior and Systematics Grønkjær, Peter Ottosen, Rasmus Joensen, Thor Reeve, Lee Nielsen, Einar E. Hedeholm, Rasmus Intra‐annual variation in feeding of Atlantic cod <scp> Gadus morhua </scp>: the importance of ephemeral prey bursts |
topic_facet |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
description |
Abstract Seasonal prey bursts are important for the life cycles and energy budgets of many predators. This study documents the diet and, especially, the importance of the ephemeral occurrence of capelin as prey for Atlantic cod ( Gadus morhua ) in Godthaabsfjord, west Greenland, over an annual cycle. The cod showed clear differences in diet composition on the 11 sampling dates resulting in a spring–summer, late summer–autumn and winter cluster. Moreover, a single sampling date, 12 May, was defined by cod gorge feeding on spawning capelin, which led to average stomach contents 4.3 times higher than the average for the remaining sampling dates. Changes in nitrogen stable isotope values from 22 April to 7 July in cod liver and muscle tissue were used to calculate the consumption of capelin. Based on this, the consumption of capelin varied between 538 and 658 g wet weight for a 1.3 kg cod. Using published consumption/biomass estimates and observed growth rates, the capelin intake corresponds to 10.1%–33.3% of the annual food consumption and accounts for 28.1%–34.5% of the annual growth of the cod. The present study documents the omnivorous feeding mode of Atlantic cod but highlights the utilization and importance of ephemeral prey bursts for the annual energy budget of the cod. It is hypothesized that access to capelin is critical for the postspawning recovery of Godthaabsfjord cod. |
author2 |
Danish Agency for Science and Higher Education |
format |
Article in Journal/Newspaper |
author |
Grønkjær, Peter Ottosen, Rasmus Joensen, Thor Reeve, Lee Nielsen, Einar E. Hedeholm, Rasmus |
author_facet |
Grønkjær, Peter Ottosen, Rasmus Joensen, Thor Reeve, Lee Nielsen, Einar E. Hedeholm, Rasmus |
author_sort |
Grønkjær, Peter |
title |
Intra‐annual variation in feeding of Atlantic cod <scp> Gadus morhua </scp>: the importance of ephemeral prey bursts |
title_short |
Intra‐annual variation in feeding of Atlantic cod <scp> Gadus morhua </scp>: the importance of ephemeral prey bursts |
title_full |
Intra‐annual variation in feeding of Atlantic cod <scp> Gadus morhua </scp>: the importance of ephemeral prey bursts |
title_fullStr |
Intra‐annual variation in feeding of Atlantic cod <scp> Gadus morhua </scp>: the importance of ephemeral prey bursts |
title_full_unstemmed |
Intra‐annual variation in feeding of Atlantic cod <scp> Gadus morhua </scp>: the importance of ephemeral prey bursts |
title_sort |
intra‐annual variation in feeding of atlantic cod <scp> gadus morhua </scp>: the importance of ephemeral prey bursts |
publisher |
Wiley |
publishDate |
2020 |
url |
http://dx.doi.org/10.1111/jfb.14520 https://onlinelibrary.wiley.com/doi/pdf/10.1111/jfb.14520 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/jfb.14520 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
atlantic cod Gadus morhua Greenland |
genre_facet |
atlantic cod Gadus morhua Greenland |
op_source |
Journal of Fish Biology volume 97, issue 5, page 1507-1519 ISSN 0022-1112 1095-8649 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/jfb.14520 |
container_title |
Journal of Fish Biology |
container_volume |
97 |
container_issue |
5 |
container_start_page |
1507 |
op_container_end_page |
1519 |
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1784266045491511296 |