Seasonal variability in non-consumptive mortality of Arctic zooplankton
Abstract Recent observations from high-latitude marine ecosystems indicate that non-consumptive mortality may be particularly high in Arctic zooplankton during the polar night. Here we have estimated the contribution of dead organisms to the mesozooplankton community in the high Arctic (Svalbard 78–...
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2021
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Online Access: | http://dx.doi.org/10.1093/plankt/fbab042 http://academic.oup.com/plankt/article-pdf/43/4/565/39321025/fbab042.pdf |
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croxfordunivpr:10.1093/plankt/fbab042 2024-05-19T07:35:03+00:00 Seasonal variability in non-consumptive mortality of Arctic zooplankton Daase, Malin Søreide, Janne E Koski, Marja Fram Centre Flagship Arctic Ocean Tromsø Forskningsstiftelse Norwegian Research Council 2021 http://dx.doi.org/10.1093/plankt/fbab042 http://academic.oup.com/plankt/article-pdf/43/4/565/39321025/fbab042.pdf en eng Oxford University Press (OUP) http://creativecommons.org/licenses/by/4.0/ Journal of Plankton Research volume 43, issue 4, page 565-585 ISSN 0142-7873 1464-3774 journal-article 2021 croxfordunivpr https://doi.org/10.1093/plankt/fbab042 2024-05-02T09:32:16Z Abstract Recent observations from high-latitude marine ecosystems indicate that non-consumptive mortality may be particularly high in Arctic zooplankton during the polar night. Here we have estimated the contribution of dead organisms to the mesozooplankton community in the high Arctic (Svalbard 78–81oN) during the polar night (January), in spring (May) and in late summer (end of August). To identify in situ dead organisms, we used Neutral Red Stain. The dead zooplankton fraction consisted mainly of copepods, while the contribution of dead non-copepods was low in all seasons. The absolute abundance of dead copepods varied little between seasons; however, the relative contribution of dead copepods was highest in January with 11–35% of the copepods classified as dead, in contrast to 2–12% in spring and summer. Furthermore, there were species-specific differences: copepods of the genus Calanus contributed more to the dead fraction of the copepod community during the polar night compared to spring and summer, leading to a higher “dead” biomass in winter. We conclude that non-consumptive winter mortality is considerable in calanoid copepods in the Arctic and an important but so far neglected component of the passive carbon flux, providing carbon in larger portions for higher trophic level consumers during the low-productive winter. Article in Journal/Newspaper Arctic Mesozooplankton polar night Svalbard Zooplankton Copepods Oxford University Press Journal of Plankton Research |
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Open Polar |
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Oxford University Press |
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croxfordunivpr |
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English |
description |
Abstract Recent observations from high-latitude marine ecosystems indicate that non-consumptive mortality may be particularly high in Arctic zooplankton during the polar night. Here we have estimated the contribution of dead organisms to the mesozooplankton community in the high Arctic (Svalbard 78–81oN) during the polar night (January), in spring (May) and in late summer (end of August). To identify in situ dead organisms, we used Neutral Red Stain. The dead zooplankton fraction consisted mainly of copepods, while the contribution of dead non-copepods was low in all seasons. The absolute abundance of dead copepods varied little between seasons; however, the relative contribution of dead copepods was highest in January with 11–35% of the copepods classified as dead, in contrast to 2–12% in spring and summer. Furthermore, there were species-specific differences: copepods of the genus Calanus contributed more to the dead fraction of the copepod community during the polar night compared to spring and summer, leading to a higher “dead” biomass in winter. We conclude that non-consumptive winter mortality is considerable in calanoid copepods in the Arctic and an important but so far neglected component of the passive carbon flux, providing carbon in larger portions for higher trophic level consumers during the low-productive winter. |
author2 |
Koski, Marja Fram Centre Flagship Arctic Ocean Tromsø Forskningsstiftelse Norwegian Research Council |
format |
Article in Journal/Newspaper |
author |
Daase, Malin Søreide, Janne E |
spellingShingle |
Daase, Malin Søreide, Janne E Seasonal variability in non-consumptive mortality of Arctic zooplankton |
author_facet |
Daase, Malin Søreide, Janne E |
author_sort |
Daase, Malin |
title |
Seasonal variability in non-consumptive mortality of Arctic zooplankton |
title_short |
Seasonal variability in non-consumptive mortality of Arctic zooplankton |
title_full |
Seasonal variability in non-consumptive mortality of Arctic zooplankton |
title_fullStr |
Seasonal variability in non-consumptive mortality of Arctic zooplankton |
title_full_unstemmed |
Seasonal variability in non-consumptive mortality of Arctic zooplankton |
title_sort |
seasonal variability in non-consumptive mortality of arctic zooplankton |
publisher |
Oxford University Press (OUP) |
publishDate |
2021 |
url |
http://dx.doi.org/10.1093/plankt/fbab042 http://academic.oup.com/plankt/article-pdf/43/4/565/39321025/fbab042.pdf |
genre |
Arctic Mesozooplankton polar night Svalbard Zooplankton Copepods |
genre_facet |
Arctic Mesozooplankton polar night Svalbard Zooplankton Copepods |
op_source |
Journal of Plankton Research volume 43, issue 4, page 565-585 ISSN 0142-7873 1464-3774 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1093/plankt/fbab042 |
container_title |
Journal of Plankton Research |
_version_ |
1799473385590226944 |