Energy content of krill and amphipods in the Barents Sea from summer to winter: variation across species and size
Arctic zooplankton develop large energy reserves, as an adaptation to strong seasonality, making them valuable prey items. We quantified the energy content (kJ g−1 dry weight) of abundant krill (arcto-boreal, Thysanoessa inermis and boreal, Meganyctiphanes norvegica) and amphipods (Arctic, Themisto...
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ftoslouniv:oai:www.duo.uio.no:10852/103224 2023-09-05T13:16:55+02:00 Energy content of krill and amphipods in the Barents Sea from summer to winter: variation across species and size ENEngelskEnglishEnergy content of krill and amphipods in the Barents Sea from summer to winter: variation across species and size Nowicki, Robynne Borgå, Katrine Gabrielsen, Geir W. Varpe, Øystein 2023-02-23T12:34:51Z http://hdl.handle.net/10852/103224 https://doi.org/10.1007/s00300-023-03112-0 EN eng NFR/276730 Nowicki, Robynne Borgå, Katrine Gabrielsen, Geir W. Varpe, Øystein . Energy content of krill and amphipods in the Barents Sea from summer to winter: variation across species and size. Polar Biology. 2023, 46, 139-150 http://hdl.handle.net/10852/103224 2128551 info:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Polar Biology&rft.volume=46&rft.spage=139&rft.date=2023 Polar Biology 46 2 139 150 https://doi.org/10.1007/s00300-023-03112-0 Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/ 0722-4060 Journal article Tidsskriftartikkel Peer reviewed PublishedVersion 2023 ftoslouniv https://doi.org/10.1007/s00300-023-03112-0 2023-08-16T22:38:51Z Arctic zooplankton develop large energy reserves, as an adaptation to strong seasonality, making them valuable prey items. We quantified the energy content (kJ g−1 dry weight) of abundant krill (arcto-boreal, Thysanoessa inermis and boreal, Meganyctiphanes norvegica) and amphipods (Arctic, Themisto libellula and sub-Arctic-boreal, Themisto abyssorum) in the Barents Sea in late summer (August) and early winter (December). Variation in energy content was attributed to species-specific traits and body size categories, the latter in part as a proxy for ontogeny. T. inermis had the highest energy content, (Aug: 26.8 ± 1.5 (SD) kJ g−1) and remained similar from summer to winter. Energy content increased in M. norvegica and decreased in both amphipod species, with the lowest energy content being in T. abyssorum (Dec: 17.8 ± 0.8 kJ g−1). The effect of body size varied between species, with energy content increasing with size in T. inermis and T. libellula, and no change with size in M. norvegica and T. abyssorum. The reproductive stages of T. libellula differed in energy content, being highest in gravid females. Energy content varied with species’ dependence on energy storage. Our findings highlight how phylogenetically and morphologically similar prey items cannot necessarily be considered equal from a predator´s perspective. Energetically, the northern T. inermis was higher quality compared to the more southern M. norvegica, and mostly so during summer. Ecological models and management strategies should consider such variation in prey quality, especially as Arctic borealization is expected to change species composition and the energetic landscape for predators. Article in Journal/Newspaper Arctic Barents Sea Meganyctiphanes norvegica Polar Biology Themisto abyssorum Themisto Themisto libellula Zooplankton Thysanoessa inermis Universitet i Oslo: Digitale utgivelser ved UiO (DUO) Arctic Barents Sea Polar Biology 46 2 139 150 |
institution |
Open Polar |
collection |
Universitet i Oslo: Digitale utgivelser ved UiO (DUO) |
op_collection_id |
ftoslouniv |
language |
English |
description |
Arctic zooplankton develop large energy reserves, as an adaptation to strong seasonality, making them valuable prey items. We quantified the energy content (kJ g−1 dry weight) of abundant krill (arcto-boreal, Thysanoessa inermis and boreal, Meganyctiphanes norvegica) and amphipods (Arctic, Themisto libellula and sub-Arctic-boreal, Themisto abyssorum) in the Barents Sea in late summer (August) and early winter (December). Variation in energy content was attributed to species-specific traits and body size categories, the latter in part as a proxy for ontogeny. T. inermis had the highest energy content, (Aug: 26.8 ± 1.5 (SD) kJ g−1) and remained similar from summer to winter. Energy content increased in M. norvegica and decreased in both amphipod species, with the lowest energy content being in T. abyssorum (Dec: 17.8 ± 0.8 kJ g−1). The effect of body size varied between species, with energy content increasing with size in T. inermis and T. libellula, and no change with size in M. norvegica and T. abyssorum. The reproductive stages of T. libellula differed in energy content, being highest in gravid females. Energy content varied with species’ dependence on energy storage. Our findings highlight how phylogenetically and morphologically similar prey items cannot necessarily be considered equal from a predator´s perspective. Energetically, the northern T. inermis was higher quality compared to the more southern M. norvegica, and mostly so during summer. Ecological models and management strategies should consider such variation in prey quality, especially as Arctic borealization is expected to change species composition and the energetic landscape for predators. |
format |
Article in Journal/Newspaper |
author |
Nowicki, Robynne Borgå, Katrine Gabrielsen, Geir W. Varpe, Øystein |
spellingShingle |
Nowicki, Robynne Borgå, Katrine Gabrielsen, Geir W. Varpe, Øystein Energy content of krill and amphipods in the Barents Sea from summer to winter: variation across species and size |
author_facet |
Nowicki, Robynne Borgå, Katrine Gabrielsen, Geir W. Varpe, Øystein |
author_sort |
Nowicki, Robynne |
title |
Energy content of krill and amphipods in the Barents Sea from summer to winter: variation across species and size |
title_short |
Energy content of krill and amphipods in the Barents Sea from summer to winter: variation across species and size |
title_full |
Energy content of krill and amphipods in the Barents Sea from summer to winter: variation across species and size |
title_fullStr |
Energy content of krill and amphipods in the Barents Sea from summer to winter: variation across species and size |
title_full_unstemmed |
Energy content of krill and amphipods in the Barents Sea from summer to winter: variation across species and size |
title_sort |
energy content of krill and amphipods in the barents sea from summer to winter: variation across species and size |
publishDate |
2023 |
url |
http://hdl.handle.net/10852/103224 https://doi.org/10.1007/s00300-023-03112-0 |
geographic |
Arctic Barents Sea |
geographic_facet |
Arctic Barents Sea |
genre |
Arctic Barents Sea Meganyctiphanes norvegica Polar Biology Themisto abyssorum Themisto Themisto libellula Zooplankton Thysanoessa inermis |
genre_facet |
Arctic Barents Sea Meganyctiphanes norvegica Polar Biology Themisto abyssorum Themisto Themisto libellula Zooplankton Thysanoessa inermis |
op_source |
0722-4060 |
op_relation |
NFR/276730 Nowicki, Robynne Borgå, Katrine Gabrielsen, Geir W. Varpe, Øystein . Energy content of krill and amphipods in the Barents Sea from summer to winter: variation across species and size. Polar Biology. 2023, 46, 139-150 http://hdl.handle.net/10852/103224 2128551 info:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Polar Biology&rft.volume=46&rft.spage=139&rft.date=2023 Polar Biology 46 2 139 150 https://doi.org/10.1007/s00300-023-03112-0 |
op_rights |
Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1007/s00300-023-03112-0 |
container_title |
Polar Biology |
container_volume |
46 |
container_issue |
2 |
container_start_page |
139 |
op_container_end_page |
150 |
_version_ |
1776198324224786432 |