Diets of gadoid fish in Arctic waters of Svalbard fjords during the polar night
As the climate warms, boreal fish species are expected to expand into the Arctic domain. Though water temperature is an important factor driving expansion of aquatic species, other variables may play a critical role in restricting those movements. Continuous darkness during the Arctic polar night ha...
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ftunivbergen:oai:bora.uib.no:11250/3083297 2023-09-05T13:17:00+02:00 Diets of gadoid fish in Arctic waters of Svalbard fjords during the polar night Larsen, Lars-Henrik Cusa, Marine Lure Joana Eglund-Newby, Sam Berge, Jørgen Renaud, Paul Eric Varpe, Øystein Geoffroy, Maxime Falk-Petersen, Stig 2023 application/pdf https://hdl.handle.net/11250/3083297 https://doi.org/10.1007/s00300-023-03167-z eng eng Springer urn:issn:0722-4060 https://hdl.handle.net/11250/3083297 https://doi.org/10.1007/s00300-023-03167-z cristin:2161432 Polar Biology. 2023, 46, 783–799. Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no Copyright The Author(s) 2023 Polar Biology 783–799 46 Journal article Peer reviewed 2023 ftunivbergen https://doi.org/10.1007/s00300-023-03167-z 2023-08-16T23:07:22Z As the climate warms, boreal fish species are expected to expand into the Arctic domain. Though water temperature is an important factor driving expansion of aquatic species, other variables may play a critical role in restricting those movements. Continuous darkness during the Arctic polar night has been suggested to impair foraging in visually searching boreal fish and may thus limit their northward expansion. We discuss feeding and diet composition of co-existing polar cod (Boreogadus saida), Atlantic cod (Gadus morhua), and haddock (Melanogrammus aeglefinus) during the polar night. The data presented cover January sampling during five consecutive years (2012–2016) in Svalbard fjords (78–80°N). Across species, more than 70% of individuals were feeding. Few stomachs were well filled, suggesting an overall moderate foraging activity or success. The endemic polar cod had the highest frequency of empty stomachs (40%), while Atlantic cod (25% empty) and haddock (21% empty) had fed most extensively. Diet composition indicated opportunistic feeding, with extensive diet overlap of the most abundant prey species (krill, Thysanoessa spp.) during years of highly abundant krill (2014–2015) but reverting to more distinct diets in a year (2016) with lower krill abundance. For all three species, presence of prey items in advanced degrees of digestion indicated feeding activity prior to each annual trawl sampling. The stomach fullness and diet overlap suggest that coexisting and similar sized gadoids feed on the same available prey resources during polar night. publishedVersion Article in Journal/Newspaper Arctic atlantic cod Boreogadus saida Gadus morhua Polar Biology polar cod polar night Svalbard University of Bergen: Bergen Open Research Archive (BORA-UiB) Arctic Svalbard Polar Biology 46 8 783 799 |
institution |
Open Polar |
collection |
University of Bergen: Bergen Open Research Archive (BORA-UiB) |
op_collection_id |
ftunivbergen |
language |
English |
description |
As the climate warms, boreal fish species are expected to expand into the Arctic domain. Though water temperature is an important factor driving expansion of aquatic species, other variables may play a critical role in restricting those movements. Continuous darkness during the Arctic polar night has been suggested to impair foraging in visually searching boreal fish and may thus limit their northward expansion. We discuss feeding and diet composition of co-existing polar cod (Boreogadus saida), Atlantic cod (Gadus morhua), and haddock (Melanogrammus aeglefinus) during the polar night. The data presented cover January sampling during five consecutive years (2012–2016) in Svalbard fjords (78–80°N). Across species, more than 70% of individuals were feeding. Few stomachs were well filled, suggesting an overall moderate foraging activity or success. The endemic polar cod had the highest frequency of empty stomachs (40%), while Atlantic cod (25% empty) and haddock (21% empty) had fed most extensively. Diet composition indicated opportunistic feeding, with extensive diet overlap of the most abundant prey species (krill, Thysanoessa spp.) during years of highly abundant krill (2014–2015) but reverting to more distinct diets in a year (2016) with lower krill abundance. For all three species, presence of prey items in advanced degrees of digestion indicated feeding activity prior to each annual trawl sampling. The stomach fullness and diet overlap suggest that coexisting and similar sized gadoids feed on the same available prey resources during polar night. publishedVersion |
format |
Article in Journal/Newspaper |
author |
Larsen, Lars-Henrik Cusa, Marine Lure Joana Eglund-Newby, Sam Berge, Jørgen Renaud, Paul Eric Varpe, Øystein Geoffroy, Maxime Falk-Petersen, Stig |
spellingShingle |
Larsen, Lars-Henrik Cusa, Marine Lure Joana Eglund-Newby, Sam Berge, Jørgen Renaud, Paul Eric Varpe, Øystein Geoffroy, Maxime Falk-Petersen, Stig Diets of gadoid fish in Arctic waters of Svalbard fjords during the polar night |
author_facet |
Larsen, Lars-Henrik Cusa, Marine Lure Joana Eglund-Newby, Sam Berge, Jørgen Renaud, Paul Eric Varpe, Øystein Geoffroy, Maxime Falk-Petersen, Stig |
author_sort |
Larsen, Lars-Henrik |
title |
Diets of gadoid fish in Arctic waters of Svalbard fjords during the polar night |
title_short |
Diets of gadoid fish in Arctic waters of Svalbard fjords during the polar night |
title_full |
Diets of gadoid fish in Arctic waters of Svalbard fjords during the polar night |
title_fullStr |
Diets of gadoid fish in Arctic waters of Svalbard fjords during the polar night |
title_full_unstemmed |
Diets of gadoid fish in Arctic waters of Svalbard fjords during the polar night |
title_sort |
diets of gadoid fish in arctic waters of svalbard fjords during the polar night |
publisher |
Springer |
publishDate |
2023 |
url |
https://hdl.handle.net/11250/3083297 https://doi.org/10.1007/s00300-023-03167-z |
geographic |
Arctic Svalbard |
geographic_facet |
Arctic Svalbard |
genre |
Arctic atlantic cod Boreogadus saida Gadus morhua Polar Biology polar cod polar night Svalbard |
genre_facet |
Arctic atlantic cod Boreogadus saida Gadus morhua Polar Biology polar cod polar night Svalbard |
op_source |
Polar Biology 783–799 46 |
op_relation |
urn:issn:0722-4060 https://hdl.handle.net/11250/3083297 https://doi.org/10.1007/s00300-023-03167-z cristin:2161432 Polar Biology. 2023, 46, 783–799. |
op_rights |
Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no Copyright The Author(s) 2023 |
op_doi |
https://doi.org/10.1007/s00300-023-03167-z |
container_title |
Polar Biology |
container_volume |
46 |
container_issue |
8 |
container_start_page |
783 |
op_container_end_page |
799 |
_version_ |
1776198368763052032 |