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Seasonal variability in non-consumptive mortality of Arctic zooplankton

Permanent lenke
https://hdl.handle.net/10037/23494
DOI
https://doi.org/10.1093/plankt/fbab042
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article.pdf (1.941Mb)
Publisert versjon (PDF)
Dato
2021-06-04
Type
Journal article
Tidsskriftartikkel
Peer reviewed

Forfatter
Daase, Malin; Søreide, Janne E.
Sammendrag
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.
Forlag
Oxford University Press
Sitering
Daase, Søreide. Seasonal variability in non-consumptive mortality of Arctic zooplankton. Journal of Plankton Research. 2021;43(4):565-585
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  • Artikler, rapporter og annet (arktisk og marin biologi) [1630]
Copyright 2021 The Author(s)

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