Oceanic circumpolar habitats of Antarctic krill
Surveys of Euphausia superba often target localised shelves and ice edges where their growth rates and predation losses are atypically high. Emphasis on these areas has led to the current view that krill require high food concentrations, with a distribution often linked to shelves. For a wider, circ...
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Online Access: | http://nora.nerc.ac.uk/id/eprint/6360/ http://www.int-res.com/abstracts/meps/v362/p1-23/ https://doi.org/10.3354/meps07498 |
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ftnerc:oai:nora.nerc.ac.uk:6360 2023-05-15T14:02:21+02:00 Oceanic circumpolar habitats of Antarctic krill Atkinson, A. Siegel, V. Pakhomov, E.A. Rothery, P. Loeb, V. Ross, R.M. Quetin, L.B. Schmidt, K. Fretwell, P. Murphy, E.J. Tarling, G.A. Fleming, A.H. 2008 http://nora.nerc.ac.uk/id/eprint/6360/ http://www.int-res.com/abstracts/meps/v362/p1-23/ https://doi.org/10.3354/meps07498 unknown Atkinson, A.; Siegel, V.; Pakhomov, E.A.; Rothery, P.; Loeb, V.; Ross, R.M.; Quetin, L.B.; Schmidt, K.; Fretwell, P. orcid:0000-0002-1988-5844 Murphy, E.J. orcid:0000-0002-7369-9196 Tarling, G.A. orcid:0000-0002-3753-5899 Fleming, A.H. orcid:0000-0002-0143-4527 . 2008 Oceanic circumpolar habitats of Antarctic krill. Marine Ecology Progress Series, 362. 1-23. https://doi.org/10.3354/meps07498 <https://doi.org/10.3354/meps07498> Marine Sciences Publication - Article PeerReviewed 2008 ftnerc https://doi.org/10.3354/meps07498 2023-02-17T00:02:00Z Surveys of Euphausia superba often target localised shelves and ice edges where their growth rates and predation losses are atypically high. Emphasis on these areas has led to the current view that krill require high food concentrations, with a distribution often linked to shelves. For a wider, circumpolar perspective, we compiled all available net-based density data on postlarvae from 8137 mainly summer stations from 1926 to 2004. Unlike Antarctic zooplankton, the distribution of E. superba is highly uneven, with 70% of the total stock concentrated between longitudes 0° and 90°W. Within this Atlantic sector, krill are abundant over both continental shelf and ocean. At the Antarctic Peninsula they are found mainly over the inner shelf, whereas in the Indian–Pacific sectors krill prevail in the ocean within 200 to 300 km of the shelf break. Overall, 87% of the total stock lives over deep oceanic water (>2000 m), and krill occupy regions with moderate food concentrations (0.5 to 1.0 mg chl a m–3). Advection models suggest some northwards loss from these regions and into the low chlorophyll belts of the Antarctic Circumpolar Current (ACC). We found possible evidence for a compensating southwards migration, with an increasing proportion of krill found south of the ACC as the season progresses. The retention of krill in moderately productive oceanic habitats is a key factor in their high total production. While growth rates are lower than over shelves, the ocean provides a refuge from shelf-based predators. The unusual circumpolar distribution of krill thus reflects a balance between advection, migration, top–down and bottom–up processes. Article in Journal/Newspaper Antarc* Antarctic Antarctic Krill Antarctic Peninsula Euphausia superba Natural Environment Research Council: NERC Open Research Archive Antarctic The Antarctic Antarctic Peninsula Pacific Indian Marine Ecology Progress Series 362 1 23 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
unknown |
topic |
Marine Sciences |
spellingShingle |
Marine Sciences Atkinson, A. Siegel, V. Pakhomov, E.A. Rothery, P. Loeb, V. Ross, R.M. Quetin, L.B. Schmidt, K. Fretwell, P. Murphy, E.J. Tarling, G.A. Fleming, A.H. Oceanic circumpolar habitats of Antarctic krill |
topic_facet |
Marine Sciences |
description |
Surveys of Euphausia superba often target localised shelves and ice edges where their growth rates and predation losses are atypically high. Emphasis on these areas has led to the current view that krill require high food concentrations, with a distribution often linked to shelves. For a wider, circumpolar perspective, we compiled all available net-based density data on postlarvae from 8137 mainly summer stations from 1926 to 2004. Unlike Antarctic zooplankton, the distribution of E. superba is highly uneven, with 70% of the total stock concentrated between longitudes 0° and 90°W. Within this Atlantic sector, krill are abundant over both continental shelf and ocean. At the Antarctic Peninsula they are found mainly over the inner shelf, whereas in the Indian–Pacific sectors krill prevail in the ocean within 200 to 300 km of the shelf break. Overall, 87% of the total stock lives over deep oceanic water (>2000 m), and krill occupy regions with moderate food concentrations (0.5 to 1.0 mg chl a m–3). Advection models suggest some northwards loss from these regions and into the low chlorophyll belts of the Antarctic Circumpolar Current (ACC). We found possible evidence for a compensating southwards migration, with an increasing proportion of krill found south of the ACC as the season progresses. The retention of krill in moderately productive oceanic habitats is a key factor in their high total production. While growth rates are lower than over shelves, the ocean provides a refuge from shelf-based predators. The unusual circumpolar distribution of krill thus reflects a balance between advection, migration, top–down and bottom–up processes. |
format |
Article in Journal/Newspaper |
author |
Atkinson, A. Siegel, V. Pakhomov, E.A. Rothery, P. Loeb, V. Ross, R.M. Quetin, L.B. Schmidt, K. Fretwell, P. Murphy, E.J. Tarling, G.A. Fleming, A.H. |
author_facet |
Atkinson, A. Siegel, V. Pakhomov, E.A. Rothery, P. Loeb, V. Ross, R.M. Quetin, L.B. Schmidt, K. Fretwell, P. Murphy, E.J. Tarling, G.A. Fleming, A.H. |
author_sort |
Atkinson, A. |
title |
Oceanic circumpolar habitats of Antarctic krill |
title_short |
Oceanic circumpolar habitats of Antarctic krill |
title_full |
Oceanic circumpolar habitats of Antarctic krill |
title_fullStr |
Oceanic circumpolar habitats of Antarctic krill |
title_full_unstemmed |
Oceanic circumpolar habitats of Antarctic krill |
title_sort |
oceanic circumpolar habitats of antarctic krill |
publishDate |
2008 |
url |
http://nora.nerc.ac.uk/id/eprint/6360/ http://www.int-res.com/abstracts/meps/v362/p1-23/ https://doi.org/10.3354/meps07498 |
geographic |
Antarctic The Antarctic Antarctic Peninsula Pacific Indian |
geographic_facet |
Antarctic The Antarctic Antarctic Peninsula Pacific Indian |
genre |
Antarc* Antarctic Antarctic Krill Antarctic Peninsula Euphausia superba |
genre_facet |
Antarc* Antarctic Antarctic Krill Antarctic Peninsula Euphausia superba |
op_relation |
Atkinson, A.; Siegel, V.; Pakhomov, E.A.; Rothery, P.; Loeb, V.; Ross, R.M.; Quetin, L.B.; Schmidt, K.; Fretwell, P. orcid:0000-0002-1988-5844 Murphy, E.J. orcid:0000-0002-7369-9196 Tarling, G.A. orcid:0000-0002-3753-5899 Fleming, A.H. orcid:0000-0002-0143-4527 . 2008 Oceanic circumpolar habitats of Antarctic krill. Marine Ecology Progress Series, 362. 1-23. https://doi.org/10.3354/meps07498 <https://doi.org/10.3354/meps07498> |
op_doi |
https://doi.org/10.3354/meps07498 |
container_title |
Marine Ecology Progress Series |
container_volume |
362 |
container_start_page |
1 |
op_container_end_page |
23 |
_version_ |
1766272570642923520 |