Barents Sea cod (Gadus morhua) diet composition: long-term interannual, seasonal, and ontogenetic patterns
Atlantic cod (Gadus morhua) is an ecologically and commercially important species in the North-Atlantic region. Cod is a top predator and information on its trophic ecology is integral for understanding predator–prey relationships and food-web dynamics. We present an analysis of the trophic patterns...
Published in: | ICES Journal of Marine Science |
---|---|
Main Authors: | , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2019
|
Subjects: | |
Online Access: | http://hdl.handle.net/11250/2636766 https://doi.org/10.1093/icesjms/fsz082 |
id |
ftimr:oai:imr.brage.unit.no:11250/2636766 |
---|---|
record_format |
openpolar |
spelling |
ftimr:oai:imr.brage.unit.no:11250/2636766 2023-05-15T15:27:35+02:00 Barents Sea cod (Gadus morhua) diet composition: long-term interannual, seasonal, and ontogenetic patterns Holt, Rebecca Emma Bogstad, Bjarte Durant, Joel Marcel Dolgov, Andrey Ottersen, Geir 2019 application/vnd.openxmlformats-officedocument.wordprocessingml.document http://hdl.handle.net/11250/2636766 https://doi.org/10.1093/icesjms/fsz082 eng eng Norges forskningsråd: 255460 Norges forskningsråd: 244647 urn:issn:1054-3139 http://hdl.handle.net/11250/2636766 https://doi.org/10.1093/icesjms/fsz082 cristin:1710761 1641-1652 76 ICES Journal of Marine Science 6 Journal article Peer reviewed 2019 ftimr https://doi.org/10.1093/icesjms/fsz082 2021-09-23T20:14:22Z Atlantic cod (Gadus morhua) is an ecologically and commercially important species in the North-Atlantic region. Cod is a top predator and information on its trophic ecology is integral for understanding predator–prey relationships and food-web dynamics. We present an analysis of the trophic patterns of Barents Sea (BS) cod using a unique 33-year time-series of stomach-content data from 1984 to 2016. We assessed patterns in diet (prey) composition across years, between seasons, as well as ontogenetic trends in diet, including predator–prey size relationships. Ontogenetic shifts in diet were observed, with fish becoming more important prey with increasing cod size. A very early onset of piscivory was found in <20 cm cod. Cannibalism was found in cod > 20 cm and increased with size. Juvenile cod exhibit a tendency towards consuming prey up to 33% of their body length, whereas larger cod feed on all prey sizes, resulting in asymmetric predator–prey size distributions. Diet varied significantly during 1984–2016, consistent with changes in both prey, cod abundance, and distribution. Seasonal differences were observed; capelin dominated the winter diet, whereas cod, polar cod, and other fish species were prevalent in summer/autumn months. This work represents an important step towards understanding trophic linkages that determine BS ecosystem dynamics. submittedVersion Article in Journal/Newspaper atlantic cod Barents Sea Gadus morhua North Atlantic polar cod Institute for Marine Research: Brage IMR Barents Sea ICES Journal of Marine Science 76 6 1641 1652 |
institution |
Open Polar |
collection |
Institute for Marine Research: Brage IMR |
op_collection_id |
ftimr |
language |
English |
description |
Atlantic cod (Gadus morhua) is an ecologically and commercially important species in the North-Atlantic region. Cod is a top predator and information on its trophic ecology is integral for understanding predator–prey relationships and food-web dynamics. We present an analysis of the trophic patterns of Barents Sea (BS) cod using a unique 33-year time-series of stomach-content data from 1984 to 2016. We assessed patterns in diet (prey) composition across years, between seasons, as well as ontogenetic trends in diet, including predator–prey size relationships. Ontogenetic shifts in diet were observed, with fish becoming more important prey with increasing cod size. A very early onset of piscivory was found in <20 cm cod. Cannibalism was found in cod > 20 cm and increased with size. Juvenile cod exhibit a tendency towards consuming prey up to 33% of their body length, whereas larger cod feed on all prey sizes, resulting in asymmetric predator–prey size distributions. Diet varied significantly during 1984–2016, consistent with changes in both prey, cod abundance, and distribution. Seasonal differences were observed; capelin dominated the winter diet, whereas cod, polar cod, and other fish species were prevalent in summer/autumn months. This work represents an important step towards understanding trophic linkages that determine BS ecosystem dynamics. submittedVersion |
format |
Article in Journal/Newspaper |
author |
Holt, Rebecca Emma Bogstad, Bjarte Durant, Joel Marcel Dolgov, Andrey Ottersen, Geir |
spellingShingle |
Holt, Rebecca Emma Bogstad, Bjarte Durant, Joel Marcel Dolgov, Andrey Ottersen, Geir Barents Sea cod (Gadus morhua) diet composition: long-term interannual, seasonal, and ontogenetic patterns |
author_facet |
Holt, Rebecca Emma Bogstad, Bjarte Durant, Joel Marcel Dolgov, Andrey Ottersen, Geir |
author_sort |
Holt, Rebecca Emma |
title |
Barents Sea cod (Gadus morhua) diet composition: long-term interannual, seasonal, and ontogenetic patterns |
title_short |
Barents Sea cod (Gadus morhua) diet composition: long-term interannual, seasonal, and ontogenetic patterns |
title_full |
Barents Sea cod (Gadus morhua) diet composition: long-term interannual, seasonal, and ontogenetic patterns |
title_fullStr |
Barents Sea cod (Gadus morhua) diet composition: long-term interannual, seasonal, and ontogenetic patterns |
title_full_unstemmed |
Barents Sea cod (Gadus morhua) diet composition: long-term interannual, seasonal, and ontogenetic patterns |
title_sort |
barents sea cod (gadus morhua) diet composition: long-term interannual, seasonal, and ontogenetic patterns |
publishDate |
2019 |
url |
http://hdl.handle.net/11250/2636766 https://doi.org/10.1093/icesjms/fsz082 |
geographic |
Barents Sea |
geographic_facet |
Barents Sea |
genre |
atlantic cod Barents Sea Gadus morhua North Atlantic polar cod |
genre_facet |
atlantic cod Barents Sea Gadus morhua North Atlantic polar cod |
op_source |
1641-1652 76 ICES Journal of Marine Science 6 |
op_relation |
Norges forskningsråd: 255460 Norges forskningsråd: 244647 urn:issn:1054-3139 http://hdl.handle.net/11250/2636766 https://doi.org/10.1093/icesjms/fsz082 cristin:1710761 |
op_doi |
https://doi.org/10.1093/icesjms/fsz082 |
container_title |
ICES Journal of Marine Science |
container_volume |
76 |
container_issue |
6 |
container_start_page |
1641 |
op_container_end_page |
1652 |
_version_ |
1766358006019129344 |