The association of Antarctic krill Euphausia superba with the under-ice habitat.
The association of Antarctic krill Euphausia superba with the under-ice habitat was investigated in the Lazarev Sea (Southern Ocean) during austral summer, autumn and winter. Data were obtained using novel Surface and Under Ice Trawls (SUIT), which sampled the 0-2 m surface layer both under sea ice...
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ftdoajarticles:oai:doaj.org/article:f484b0e71a4b4f0db616a881ee17feeb 2023-05-15T14:00:48+02:00 The association of Antarctic krill Euphausia superba with the under-ice habitat. Hauke Flores Jan Andries van Franeker Volker Siegel Matilda Haraldsson Volker Strass Erik Hubert Meesters Ulrich Bathmann Willem Jan Wolff 2012-01-01T00:00:00Z https://doi.org/10.1371/journal.pone.0031775 https://doaj.org/article/f484b0e71a4b4f0db616a881ee17feeb EN eng Public Library of Science (PLoS) https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/22384073/?tool=EBI https://doaj.org/toc/1932-6203 1932-6203 doi:10.1371/journal.pone.0031775 https://doaj.org/article/f484b0e71a4b4f0db616a881ee17feeb PLoS ONE, Vol 7, Iss 2, p e31775 (2012) Medicine R Science Q article 2012 ftdoajarticles https://doi.org/10.1371/journal.pone.0031775 2022-12-31T04:15:14Z The association of Antarctic krill Euphausia superba with the under-ice habitat was investigated in the Lazarev Sea (Southern Ocean) during austral summer, autumn and winter. Data were obtained using novel Surface and Under Ice Trawls (SUIT), which sampled the 0-2 m surface layer both under sea ice and in open water. Average surface layer densities ranged between 0.8 individuals m(-2) in summer and autumn, and 2.7 individuals m(-2) in winter. In summer, under-ice densities of Antarctic krill were significantly higher than in open waters. In autumn, the opposite pattern was observed. Under winter sea ice, densities were often low, but repeatedly far exceeded summer and autumn maxima. Statistical models showed that during summer high densities of Antarctic krill in the 0-2 m layer were associated with high ice coverage and shallow mixed layer depths, among other factors. In autumn and winter, density was related to hydrographical parameters. Average under-ice densities from the 0-2 m layer were higher than corresponding values from the 0-200 m layer collected with Rectangular Midwater Trawls (RMT) in summer. In winter, under-ice densities far surpassed maximum 0-200 m densities on several occasions. This indicates that the importance of the ice-water interface layer may be under-estimated by the pelagic nets and sonars commonly used to estimate the population size of Antarctic krill for management purposes, due to their limited ability to sample this habitat. Our results provide evidence for an almost year-round association of Antarctic krill with the under-ice habitat, hundreds of kilometres into the ice-covered area of the Lazarev Sea. Local concentrations of postlarval Antarctic krill under winter sea ice suggest that sea ice biota are important for their winter survival. These findings emphasise the susceptibility of an ecological key species to changing sea ice habitats, suggesting potential ramifications on Antarctic ecosystems induced by climate change. Article in Journal/Newspaper Antarc* Antarctic Antarctic Krill Euphausia superba Lazarev Sea Sea ice Southern Ocean Directory of Open Access Journals: DOAJ Articles Antarctic Austral Lazarev ENVELOPE(12.917,12.917,-69.967,-69.967) Lazarev Sea ENVELOPE(7.000,7.000,-68.000,-68.000) Southern Ocean PLoS ONE 7 2 e31775 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Medicine R Science Q |
spellingShingle |
Medicine R Science Q Hauke Flores Jan Andries van Franeker Volker Siegel Matilda Haraldsson Volker Strass Erik Hubert Meesters Ulrich Bathmann Willem Jan Wolff The association of Antarctic krill Euphausia superba with the under-ice habitat. |
topic_facet |
Medicine R Science Q |
description |
The association of Antarctic krill Euphausia superba with the under-ice habitat was investigated in the Lazarev Sea (Southern Ocean) during austral summer, autumn and winter. Data were obtained using novel Surface and Under Ice Trawls (SUIT), which sampled the 0-2 m surface layer both under sea ice and in open water. Average surface layer densities ranged between 0.8 individuals m(-2) in summer and autumn, and 2.7 individuals m(-2) in winter. In summer, under-ice densities of Antarctic krill were significantly higher than in open waters. In autumn, the opposite pattern was observed. Under winter sea ice, densities were often low, but repeatedly far exceeded summer and autumn maxima. Statistical models showed that during summer high densities of Antarctic krill in the 0-2 m layer were associated with high ice coverage and shallow mixed layer depths, among other factors. In autumn and winter, density was related to hydrographical parameters. Average under-ice densities from the 0-2 m layer were higher than corresponding values from the 0-200 m layer collected with Rectangular Midwater Trawls (RMT) in summer. In winter, under-ice densities far surpassed maximum 0-200 m densities on several occasions. This indicates that the importance of the ice-water interface layer may be under-estimated by the pelagic nets and sonars commonly used to estimate the population size of Antarctic krill for management purposes, due to their limited ability to sample this habitat. Our results provide evidence for an almost year-round association of Antarctic krill with the under-ice habitat, hundreds of kilometres into the ice-covered area of the Lazarev Sea. Local concentrations of postlarval Antarctic krill under winter sea ice suggest that sea ice biota are important for their winter survival. These findings emphasise the susceptibility of an ecological key species to changing sea ice habitats, suggesting potential ramifications on Antarctic ecosystems induced by climate change. |
format |
Article in Journal/Newspaper |
author |
Hauke Flores Jan Andries van Franeker Volker Siegel Matilda Haraldsson Volker Strass Erik Hubert Meesters Ulrich Bathmann Willem Jan Wolff |
author_facet |
Hauke Flores Jan Andries van Franeker Volker Siegel Matilda Haraldsson Volker Strass Erik Hubert Meesters Ulrich Bathmann Willem Jan Wolff |
author_sort |
Hauke Flores |
title |
The association of Antarctic krill Euphausia superba with the under-ice habitat. |
title_short |
The association of Antarctic krill Euphausia superba with the under-ice habitat. |
title_full |
The association of Antarctic krill Euphausia superba with the under-ice habitat. |
title_fullStr |
The association of Antarctic krill Euphausia superba with the under-ice habitat. |
title_full_unstemmed |
The association of Antarctic krill Euphausia superba with the under-ice habitat. |
title_sort |
association of antarctic krill euphausia superba with the under-ice habitat. |
publisher |
Public Library of Science (PLoS) |
publishDate |
2012 |
url |
https://doi.org/10.1371/journal.pone.0031775 https://doaj.org/article/f484b0e71a4b4f0db616a881ee17feeb |
long_lat |
ENVELOPE(12.917,12.917,-69.967,-69.967) ENVELOPE(7.000,7.000,-68.000,-68.000) |
geographic |
Antarctic Austral Lazarev Lazarev Sea Southern Ocean |
geographic_facet |
Antarctic Austral Lazarev Lazarev Sea Southern Ocean |
genre |
Antarc* Antarctic Antarctic Krill Euphausia superba Lazarev Sea Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctic Krill Euphausia superba Lazarev Sea Sea ice Southern Ocean |
op_source |
PLoS ONE, Vol 7, Iss 2, p e31775 (2012) |
op_relation |
https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/22384073/?tool=EBI https://doaj.org/toc/1932-6203 1932-6203 doi:10.1371/journal.pone.0031775 https://doaj.org/article/f484b0e71a4b4f0db616a881ee17feeb |
op_doi |
https://doi.org/10.1371/journal.pone.0031775 |
container_title |
PLoS ONE |
container_volume |
7 |
container_issue |
2 |
container_start_page |
e31775 |
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1766270143650856960 |