The importance of Calanus glacialis for the feeding success of young polar cod: a circumpolar synthesis
Abstract Understanding the feeding ecology of polar cod ( Boreogadus saida ) during its first year of life is crucial to forecasting its response to the ongoing borealization of Arctic seas. We investigated the relationships between diet composition and feeding success in 1797 polar cod larvae and j...
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crspringernat:10.1007/s00300-020-02643-0 2023-05-15T14:52:04+02:00 The importance of Calanus glacialis for the feeding success of young polar cod: a circumpolar synthesis Bouchard, Caroline Fortier, Louis ArcticNet Natural Sciences and Engineering Research Council of Canada Canada Foundation for Innovation Canada Research Chairs 2020 http://dx.doi.org/10.1007/s00300-020-02643-0 https://link.springer.com/content/pdf/10.1007/s00300-020-02643-0.pdf https://link.springer.com/article/10.1007/s00300-020-02643-0/fulltext.html en eng Springer Science and Business Media LLC https://creativecommons.org/licenses/by/4.0 https://creativecommons.org/licenses/by/4.0 CC-BY Polar Biology volume 43, issue 8, page 1095-1107 ISSN 0722-4060 1432-2056 General Agricultural and Biological Sciences journal-article 2020 crspringernat https://doi.org/10.1007/s00300-020-02643-0 2022-01-04T13:17:42Z Abstract Understanding the feeding ecology of polar cod ( Boreogadus saida ) during its first year of life is crucial to forecasting its response to the ongoing borealization of Arctic seas. We investigated the relationships between diet composition and feeding success in 1797 polar cod larvae and juveniles 4.5–55.6 mm standard length (SL) collected in five Arctic seas from 1993 to 2009. Prey were identified to species and developmental stages when possible, measured, and their carbon content was estimated using taxon-specific allometric equations. Feeding success was defined as the ratio of ingested carbon to fish weight. Carbon uptake in polar cod larvae < 15 mm was sourced primarily from calanoid copepods eggs and nauplii which were positively selected from the plankton. With increasing length, carbon sources shifted from eggs and nauplii to the copepodites of Calanus glacialis , Calanus hyperboreus and Pseudocalanus spp. Calanus glacialis copepodites were the main carbon source in polar cod > 25 mm and the only copepodite positively selected for. Pseudocalanus spp. copepodites became important replacement prey when C. glacialis left the epipelagic layer at the end of summer. Calanus glacialis was the preferred prey of polar cod, contributing from 23 to 84% of carbon uptake at any stage in the early development. Feeding success was determined by the number of prey captured in larvae < 15 mm and by the size of prey in juveniles > 30 mm. As Arctic seas warm, the progressive displacement of C. glacialis by the smaller Calanus finmarchicus could accelerate the replacement of polar cod, the dominant Arctic forage fish, by boreal species. Article in Journal/Newspaper Arctic Boreogadus saida Calanus finmarchicus Calanus glacialis Calanus hyperboreus Polar Biology polar cod Copepods Springer Nature (via Crossref) Arctic Polar Biology 43 8 1095 1107 |
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Open Polar |
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Springer Nature (via Crossref) |
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crspringernat |
language |
English |
topic |
General Agricultural and Biological Sciences |
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General Agricultural and Biological Sciences Bouchard, Caroline Fortier, Louis The importance of Calanus glacialis for the feeding success of young polar cod: a circumpolar synthesis |
topic_facet |
General Agricultural and Biological Sciences |
description |
Abstract Understanding the feeding ecology of polar cod ( Boreogadus saida ) during its first year of life is crucial to forecasting its response to the ongoing borealization of Arctic seas. We investigated the relationships between diet composition and feeding success in 1797 polar cod larvae and juveniles 4.5–55.6 mm standard length (SL) collected in five Arctic seas from 1993 to 2009. Prey were identified to species and developmental stages when possible, measured, and their carbon content was estimated using taxon-specific allometric equations. Feeding success was defined as the ratio of ingested carbon to fish weight. Carbon uptake in polar cod larvae < 15 mm was sourced primarily from calanoid copepods eggs and nauplii which were positively selected from the plankton. With increasing length, carbon sources shifted from eggs and nauplii to the copepodites of Calanus glacialis , Calanus hyperboreus and Pseudocalanus spp. Calanus glacialis copepodites were the main carbon source in polar cod > 25 mm and the only copepodite positively selected for. Pseudocalanus spp. copepodites became important replacement prey when C. glacialis left the epipelagic layer at the end of summer. Calanus glacialis was the preferred prey of polar cod, contributing from 23 to 84% of carbon uptake at any stage in the early development. Feeding success was determined by the number of prey captured in larvae < 15 mm and by the size of prey in juveniles > 30 mm. As Arctic seas warm, the progressive displacement of C. glacialis by the smaller Calanus finmarchicus could accelerate the replacement of polar cod, the dominant Arctic forage fish, by boreal species. |
author2 |
ArcticNet Natural Sciences and Engineering Research Council of Canada Canada Foundation for Innovation Canada Research Chairs |
format |
Article in Journal/Newspaper |
author |
Bouchard, Caroline Fortier, Louis |
author_facet |
Bouchard, Caroline Fortier, Louis |
author_sort |
Bouchard, Caroline |
title |
The importance of Calanus glacialis for the feeding success of young polar cod: a circumpolar synthesis |
title_short |
The importance of Calanus glacialis for the feeding success of young polar cod: a circumpolar synthesis |
title_full |
The importance of Calanus glacialis for the feeding success of young polar cod: a circumpolar synthesis |
title_fullStr |
The importance of Calanus glacialis for the feeding success of young polar cod: a circumpolar synthesis |
title_full_unstemmed |
The importance of Calanus glacialis for the feeding success of young polar cod: a circumpolar synthesis |
title_sort |
importance of calanus glacialis for the feeding success of young polar cod: a circumpolar synthesis |
publisher |
Springer Science and Business Media LLC |
publishDate |
2020 |
url |
http://dx.doi.org/10.1007/s00300-020-02643-0 https://link.springer.com/content/pdf/10.1007/s00300-020-02643-0.pdf https://link.springer.com/article/10.1007/s00300-020-02643-0/fulltext.html |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Boreogadus saida Calanus finmarchicus Calanus glacialis Calanus hyperboreus Polar Biology polar cod Copepods |
genre_facet |
Arctic Boreogadus saida Calanus finmarchicus Calanus glacialis Calanus hyperboreus Polar Biology polar cod Copepods |
op_source |
Polar Biology volume 43, issue 8, page 1095-1107 ISSN 0722-4060 1432-2056 |
op_rights |
https://creativecommons.org/licenses/by/4.0 https://creativecommons.org/licenses/by/4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1007/s00300-020-02643-0 |
container_title |
Polar Biology |
container_volume |
43 |
container_issue |
8 |
container_start_page |
1095 |
op_container_end_page |
1107 |
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1766323196496183296 |