No evidence for a decline in the density of Antarctic krill Euphausia superba Dana, 1850, in the Southwest Atlantic sector between 1976 and 2016
The Antarctic marine environment is changing, and changes in the Southwest Atlantic sector have included decreases in sea ice and increases in water temperature. Associated with these changes is a reported 38% and 81% per decade decline in the numerical density (hereafter density) of Antarctic krill...
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Online Access: | https://doi.org/10.1093/jcbiol/ruy072 http://ecite.utas.edu.au/137282 |
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ftunivtasecite:oai:ecite.utas.edu.au:137282 2023-05-15T13:55:18+02:00 No evidence for a decline in the density of Antarctic krill Euphausia superba Dana, 1850, in the Southwest Atlantic sector between 1976 and 2016 Cox, MJ Candy, S de la Mare, WK Nicol, S Kawaguchi, S Gales, N 2018 application/pdf https://doi.org/10.1093/jcbiol/ruy072 http://ecite.utas.edu.au/137282 en eng Crustacean Soc http://ecite.utas.edu.au/137282/1/137282 - No evidence for a decline in the density of Antarctic krill Euphausia superba Dana.pdf http://dx.doi.org/10.1093/jcbiol/ruy072 Cox, MJ and Candy, S and de la Mare, WK and Nicol, S and Kawaguchi, S and Gales, N, No evidence for a decline in the density of Antarctic krill Euphausia superba Dana, 1850, in the Southwest Atlantic sector between 1976 and 2016, Journal of Crustacean Biology, 38, (6) pp. 656-661. ISSN 0278-0372 (2018) [Refereed Article] http://ecite.utas.edu.au/137282 Biological Sciences Ecology Marine and Estuarine Ecology (incl. Marine Ichthyology) Refereed Article PeerReviewed 2018 ftunivtasecite https://doi.org/10.1093/jcbiol/ruy072 2020-03-30T22:16:24Z The Antarctic marine environment is changing, and changes in the Southwest Atlantic sector have included decreases in sea ice and increases in water temperature. Associated with these changes is a reported 38% and 81% per decade decline in the numerical density (hereafter density) of Antarctic krill Euphausia superba Dana, 1850 , between 1976 and 2003. Few changes in other components of the ecosystem that could be attributed to such a change, such as a mass decline in krill-dependent predators, have been detected. In an ecosystem so dependent on this keystone species, a massive population decline in krill ought to have had an obvious effect. In the absence of such an effect, it is timely to revisit the issue of the purported decline in krill density. The original analysis that indicated a decline in krill density was based on the 2004 version of KRILLBASE, a database of net samples. We analysed the publicly available and updated version (version 1, accessed 30 November 2017) and our analyses did not suggest a significant decline in krill density. Rather, after accounting for sampling heterogeneity and habitat variables, average krill density appears to have been stable but with considerable inter-annual variability. Since our results were unable to find any evidence for a decline in krill density we recommend a re-appraisal of many of the paradigms that underlie much of the recent thinking about ecosystem change Antarctic waters. Such a revision is necessary to provide a firmer foundation for predictions of the effects of climate change and resource extraction on the Southern Ocean ecosystem. Article in Journal/Newspaper Antarc* Antarctic Antarctic Krill Euphausia superba Sea ice Southern Ocean eCite UTAS (University of Tasmania) Antarctic Southern Ocean The Antarctic Journal of Crustacean Biology |
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Open Polar |
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eCite UTAS (University of Tasmania) |
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ftunivtasecite |
language |
English |
topic |
Biological Sciences Ecology Marine and Estuarine Ecology (incl. Marine Ichthyology) |
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Biological Sciences Ecology Marine and Estuarine Ecology (incl. Marine Ichthyology) Cox, MJ Candy, S de la Mare, WK Nicol, S Kawaguchi, S Gales, N No evidence for a decline in the density of Antarctic krill Euphausia superba Dana, 1850, in the Southwest Atlantic sector between 1976 and 2016 |
topic_facet |
Biological Sciences Ecology Marine and Estuarine Ecology (incl. Marine Ichthyology) |
description |
The Antarctic marine environment is changing, and changes in the Southwest Atlantic sector have included decreases in sea ice and increases in water temperature. Associated with these changes is a reported 38% and 81% per decade decline in the numerical density (hereafter density) of Antarctic krill Euphausia superba Dana, 1850 , between 1976 and 2003. Few changes in other components of the ecosystem that could be attributed to such a change, such as a mass decline in krill-dependent predators, have been detected. In an ecosystem so dependent on this keystone species, a massive population decline in krill ought to have had an obvious effect. In the absence of such an effect, it is timely to revisit the issue of the purported decline in krill density. The original analysis that indicated a decline in krill density was based on the 2004 version of KRILLBASE, a database of net samples. We analysed the publicly available and updated version (version 1, accessed 30 November 2017) and our analyses did not suggest a significant decline in krill density. Rather, after accounting for sampling heterogeneity and habitat variables, average krill density appears to have been stable but with considerable inter-annual variability. Since our results were unable to find any evidence for a decline in krill density we recommend a re-appraisal of many of the paradigms that underlie much of the recent thinking about ecosystem change Antarctic waters. Such a revision is necessary to provide a firmer foundation for predictions of the effects of climate change and resource extraction on the Southern Ocean ecosystem. |
format |
Article in Journal/Newspaper |
author |
Cox, MJ Candy, S de la Mare, WK Nicol, S Kawaguchi, S Gales, N |
author_facet |
Cox, MJ Candy, S de la Mare, WK Nicol, S Kawaguchi, S Gales, N |
author_sort |
Cox, MJ |
title |
No evidence for a decline in the density of Antarctic krill Euphausia superba Dana, 1850, in the Southwest Atlantic sector between 1976 and 2016 |
title_short |
No evidence for a decline in the density of Antarctic krill Euphausia superba Dana, 1850, in the Southwest Atlantic sector between 1976 and 2016 |
title_full |
No evidence for a decline in the density of Antarctic krill Euphausia superba Dana, 1850, in the Southwest Atlantic sector between 1976 and 2016 |
title_fullStr |
No evidence for a decline in the density of Antarctic krill Euphausia superba Dana, 1850, in the Southwest Atlantic sector between 1976 and 2016 |
title_full_unstemmed |
No evidence for a decline in the density of Antarctic krill Euphausia superba Dana, 1850, in the Southwest Atlantic sector between 1976 and 2016 |
title_sort |
no evidence for a decline in the density of antarctic krill euphausia superba dana, 1850, in the southwest atlantic sector between 1976 and 2016 |
publisher |
Crustacean Soc |
publishDate |
2018 |
url |
https://doi.org/10.1093/jcbiol/ruy072 http://ecite.utas.edu.au/137282 |
geographic |
Antarctic Southern Ocean The Antarctic |
geographic_facet |
Antarctic Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Antarctic Krill Euphausia superba Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctic Krill Euphausia superba Sea ice Southern Ocean |
op_relation |
http://ecite.utas.edu.au/137282/1/137282 - No evidence for a decline in the density of Antarctic krill Euphausia superba Dana.pdf http://dx.doi.org/10.1093/jcbiol/ruy072 Cox, MJ and Candy, S and de la Mare, WK and Nicol, S and Kawaguchi, S and Gales, N, No evidence for a decline in the density of Antarctic krill Euphausia superba Dana, 1850, in the Southwest Atlantic sector between 1976 and 2016, Journal of Crustacean Biology, 38, (6) pp. 656-661. ISSN 0278-0372 (2018) [Refereed Article] http://ecite.utas.edu.au/137282 |
op_doi |
https://doi.org/10.1093/jcbiol/ruy072 |
container_title |
Journal of Crustacean Biology |
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1766261718712844288 |