Non-consumptive mortality in copepods: occurrence of Calanus spp. carcasses in the Arctic Ocean during winter
During a research cruise to the Arctic Ocean in January 2012, we observed high occurrence of carcasses of Calanus spp. We analysed live samples to separate living from dead individuals. In Rijpfjorden, an Arctic fjord in north-eastern Svalbard, 9–14% of the Calanus population were observed to be dea...
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fthighwire:oai:open-archive.highwire.org:plankt:fbt079v1 2023-05-15T14:30:33+02:00 Non-consumptive mortality in copepods: occurrence of Calanus spp. carcasses in the Arctic Ocean during winter Daase, Malin Varpe, Øystein Falk-Petersen, Stig 2013-09-07 00:36:56.0 text/html http://plankt.oxfordjournals.org/cgi/content/short/fbt079v1 https://doi.org/10.1093/plankt/fbt079 en eng Oxford University Press http://plankt.oxfordjournals.org/cgi/content/short/fbt079v1 http://dx.doi.org/10.1093/plankt/fbt079 Copyright (C) 2013, Oxford University Press Article TEXT 2013 fthighwire https://doi.org/10.1093/plankt/fbt079 2016-11-16T18:36:01Z During a research cruise to the Arctic Ocean in January 2012, we observed high occurrence of carcasses of Calanus spp. We analysed live samples to separate living from dead individuals. In Rijpfjorden, an Arctic fjord in north-eastern Svalbard, 9–14% of the Calanus population were observed to be dead. At Sofiadjupet, an oceanic basin located at 81.4oN at the southern edge of the Arctic Ocean, 94% of the Calanus at depth (between 300 and 2000 m) were dead. This is the first estimation of the contribution of carcasses to high Arctic copepod populations. Lipid sacs were preserved in part of the observed carcasses and the lipid sac area was significantly smaller in dead Calanus than in living individuals. We discuss possible causes for the observed mortality, its implication for population dynamics and energy transfer and review previous accounts of non-predatory mortality of marine copepods. In our case, partial consumption by predators and death after reproduction are unlikely causes of mortality, thus other stressors (starvation, environmental conditions, parasitic or viral infection) may be responsible. Our analysis shows that we have a poor understanding of factors other than predation causing mortality in copepod populations. Text Arctic copepod Arctic Arctic Ocean Rijpfjord* Svalbard Copepods HighWire Press (Stanford University) Arctic Arctic Ocean Rijpfjorden ENVELOPE(22.188,22.188,80.165,80.165) Sofiadjupet ENVELOPE(12.000,12.000,81.000,81.000) Svalbard Journal of Plankton Research 36 1 129 144 |
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HighWire Press (Stanford University) |
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English |
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Article |
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Article Daase, Malin Varpe, Øystein Falk-Petersen, Stig Non-consumptive mortality in copepods: occurrence of Calanus spp. carcasses in the Arctic Ocean during winter |
topic_facet |
Article |
description |
During a research cruise to the Arctic Ocean in January 2012, we observed high occurrence of carcasses of Calanus spp. We analysed live samples to separate living from dead individuals. In Rijpfjorden, an Arctic fjord in north-eastern Svalbard, 9–14% of the Calanus population were observed to be dead. At Sofiadjupet, an oceanic basin located at 81.4oN at the southern edge of the Arctic Ocean, 94% of the Calanus at depth (between 300 and 2000 m) were dead. This is the first estimation of the contribution of carcasses to high Arctic copepod populations. Lipid sacs were preserved in part of the observed carcasses and the lipid sac area was significantly smaller in dead Calanus than in living individuals. We discuss possible causes for the observed mortality, its implication for population dynamics and energy transfer and review previous accounts of non-predatory mortality of marine copepods. In our case, partial consumption by predators and death after reproduction are unlikely causes of mortality, thus other stressors (starvation, environmental conditions, parasitic or viral infection) may be responsible. Our analysis shows that we have a poor understanding of factors other than predation causing mortality in copepod populations. |
format |
Text |
author |
Daase, Malin Varpe, Øystein Falk-Petersen, Stig |
author_facet |
Daase, Malin Varpe, Øystein Falk-Petersen, Stig |
author_sort |
Daase, Malin |
title |
Non-consumptive mortality in copepods: occurrence of Calanus spp. carcasses in the Arctic Ocean during winter |
title_short |
Non-consumptive mortality in copepods: occurrence of Calanus spp. carcasses in the Arctic Ocean during winter |
title_full |
Non-consumptive mortality in copepods: occurrence of Calanus spp. carcasses in the Arctic Ocean during winter |
title_fullStr |
Non-consumptive mortality in copepods: occurrence of Calanus spp. carcasses in the Arctic Ocean during winter |
title_full_unstemmed |
Non-consumptive mortality in copepods: occurrence of Calanus spp. carcasses in the Arctic Ocean during winter |
title_sort |
non-consumptive mortality in copepods: occurrence of calanus spp. carcasses in the arctic ocean during winter |
publisher |
Oxford University Press |
publishDate |
2013 |
url |
http://plankt.oxfordjournals.org/cgi/content/short/fbt079v1 https://doi.org/10.1093/plankt/fbt079 |
long_lat |
ENVELOPE(22.188,22.188,80.165,80.165) ENVELOPE(12.000,12.000,81.000,81.000) |
geographic |
Arctic Arctic Ocean Rijpfjorden Sofiadjupet Svalbard |
geographic_facet |
Arctic Arctic Ocean Rijpfjorden Sofiadjupet Svalbard |
genre |
Arctic copepod Arctic Arctic Ocean Rijpfjord* Svalbard Copepods |
genre_facet |
Arctic copepod Arctic Arctic Ocean Rijpfjord* Svalbard Copepods |
op_relation |
http://plankt.oxfordjournals.org/cgi/content/short/fbt079v1 http://dx.doi.org/10.1093/plankt/fbt079 |
op_rights |
Copyright (C) 2013, Oxford University Press |
op_doi |
https://doi.org/10.1093/plankt/fbt079 |
container_title |
Journal of Plankton Research |
container_volume |
36 |
container_issue |
1 |
container_start_page |
129 |
op_container_end_page |
144 |
_version_ |
1766304385702297600 |