Seabed foraging by antarctic krill: Implications for stock assessment, bentho-pelagic coupling, and the vertical transfer of iron
A compilation of more than 30 studies shows that adult Antarctic krill (Euphausia superba) may frequent benthic habitats year-round, in shelf as well as oceanic waters and throughout their circumpolar range. Net and acoustic data from the Scotia Sea show that in summer 2-20 of the population reside...
Published in: | Limnology and Oceanography |
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Language: | English |
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ASLO (Association for the Sciences of Limnology and Oceanography)
2011
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Online Access: | https://oceanrep.geomar.de/id/eprint/21752/ https://oceanrep.geomar.de/id/eprint/21752/1/1411.pdf https://doi.org/10.4319/lo.2011.56.4.1411 |
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ftoceanrep:oai:oceanrep.geomar.de:21752 2023-05-15T13:54:23+02:00 Seabed foraging by antarctic krill: Implications for stock assessment, bentho-pelagic coupling, and the vertical transfer of iron Schmidt, K. Atkinson, A. Steigenberger, S. Fielding, S. Lindsay, M.C.M. Pond, D.W. Tarling, G.A. Klevjer, T.A. Allen, C.S. Nicol, S. Achterberg, Eric P. 2011-07-01 text https://oceanrep.geomar.de/id/eprint/21752/ https://oceanrep.geomar.de/id/eprint/21752/1/1411.pdf https://doi.org/10.4319/lo.2011.56.4.1411 en eng ASLO (Association for the Sciences of Limnology and Oceanography) https://oceanrep.geomar.de/id/eprint/21752/1/1411.pdf Schmidt, K., Atkinson, A., Steigenberger, S., Fielding, S., Lindsay, M. C. M., Pond, D. W., Tarling, G. A., Klevjer, T. A., Allen, C. S., Nicol, S. and Achterberg, E. P. (2011) Seabed foraging by antarctic krill: Implications for stock assessment, bentho-pelagic coupling, and the vertical transfer of iron. Limnology and Oceanography, 56 (4). pp. 1411-1428. DOI 10.4319/lo.2011.56.4.1411 <https://doi.org/10.4319/lo.2011.56.4.1411>. doi:10.4319/lo.2011.56.4.1411 Article PeerReviewed 2011 ftoceanrep https://doi.org/10.4319/lo.2011.56.4.1411 2023-04-07T15:09:49Z A compilation of more than 30 studies shows that adult Antarctic krill (Euphausia superba) may frequent benthic habitats year-round, in shelf as well as oceanic waters and throughout their circumpolar range. Net and acoustic data from the Scotia Sea show that in summer 2-20 of the population reside at depths between 200 and 2000 m, and; that large aggregations can form above the seabed. Local differences in the vertical distribution of krill indicate that reduced feeding success in surface waters, either due to predator encounter or food shortage, might initiate such deep migrations and results in benthic feeding. Fatty acid and microscopic analyses of stomach content confirm two different foraging habitats for Antarctic krill: the upper ocean, where fresh phytoplankton is the main food source, and deeper water or the seabed, where detritus and copepods are consumed. Krill caught in upper waters retain signals of benthic feeding, suggesting frequent and dynamic exchange between surface and seabed. Krill contained up to 260 nmol iron per stomach when returning from seabed feeding. About 5 of this iron is labile, i.e., potentially available to phytoplankton. Due to their large biomass, frequent benthic feeding, and acidic digestion of particulate iron, krill might facilitate an input of new iron to Southern Ocean surface waters. Deep migrations and foraging at the seabed are significant parts of krill ecology, and the vertical fluxes involved in this behavior are important for the coupling of benthic and pelagic food webs and their elemental repositories. © 2011, by the American Society of Limnology and Oceanography, Inc. Article in Journal/Newspaper Antarc* Antarctic Antarctic Krill Euphausia superba Scotia Sea Southern Ocean Copepods OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Antarctic Scotia Sea Southern Ocean Limnology and Oceanography 56 4 1411 1428 |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
A compilation of more than 30 studies shows that adult Antarctic krill (Euphausia superba) may frequent benthic habitats year-round, in shelf as well as oceanic waters and throughout their circumpolar range. Net and acoustic data from the Scotia Sea show that in summer 2-20 of the population reside at depths between 200 and 2000 m, and; that large aggregations can form above the seabed. Local differences in the vertical distribution of krill indicate that reduced feeding success in surface waters, either due to predator encounter or food shortage, might initiate such deep migrations and results in benthic feeding. Fatty acid and microscopic analyses of stomach content confirm two different foraging habitats for Antarctic krill: the upper ocean, where fresh phytoplankton is the main food source, and deeper water or the seabed, where detritus and copepods are consumed. Krill caught in upper waters retain signals of benthic feeding, suggesting frequent and dynamic exchange between surface and seabed. Krill contained up to 260 nmol iron per stomach when returning from seabed feeding. About 5 of this iron is labile, i.e., potentially available to phytoplankton. Due to their large biomass, frequent benthic feeding, and acidic digestion of particulate iron, krill might facilitate an input of new iron to Southern Ocean surface waters. Deep migrations and foraging at the seabed are significant parts of krill ecology, and the vertical fluxes involved in this behavior are important for the coupling of benthic and pelagic food webs and their elemental repositories. © 2011, by the American Society of Limnology and Oceanography, Inc. |
format |
Article in Journal/Newspaper |
author |
Schmidt, K. Atkinson, A. Steigenberger, S. Fielding, S. Lindsay, M.C.M. Pond, D.W. Tarling, G.A. Klevjer, T.A. Allen, C.S. Nicol, S. Achterberg, Eric P. |
spellingShingle |
Schmidt, K. Atkinson, A. Steigenberger, S. Fielding, S. Lindsay, M.C.M. Pond, D.W. Tarling, G.A. Klevjer, T.A. Allen, C.S. Nicol, S. Achterberg, Eric P. Seabed foraging by antarctic krill: Implications for stock assessment, bentho-pelagic coupling, and the vertical transfer of iron |
author_facet |
Schmidt, K. Atkinson, A. Steigenberger, S. Fielding, S. Lindsay, M.C.M. Pond, D.W. Tarling, G.A. Klevjer, T.A. Allen, C.S. Nicol, S. Achterberg, Eric P. |
author_sort |
Schmidt, K. |
title |
Seabed foraging by antarctic krill: Implications for stock assessment, bentho-pelagic coupling, and the vertical transfer of iron |
title_short |
Seabed foraging by antarctic krill: Implications for stock assessment, bentho-pelagic coupling, and the vertical transfer of iron |
title_full |
Seabed foraging by antarctic krill: Implications for stock assessment, bentho-pelagic coupling, and the vertical transfer of iron |
title_fullStr |
Seabed foraging by antarctic krill: Implications for stock assessment, bentho-pelagic coupling, and the vertical transfer of iron |
title_full_unstemmed |
Seabed foraging by antarctic krill: Implications for stock assessment, bentho-pelagic coupling, and the vertical transfer of iron |
title_sort |
seabed foraging by antarctic krill: implications for stock assessment, bentho-pelagic coupling, and the vertical transfer of iron |
publisher |
ASLO (Association for the Sciences of Limnology and Oceanography) |
publishDate |
2011 |
url |
https://oceanrep.geomar.de/id/eprint/21752/ https://oceanrep.geomar.de/id/eprint/21752/1/1411.pdf https://doi.org/10.4319/lo.2011.56.4.1411 |
geographic |
Antarctic Scotia Sea Southern Ocean |
geographic_facet |
Antarctic Scotia Sea Southern Ocean |
genre |
Antarc* Antarctic Antarctic Krill Euphausia superba Scotia Sea Southern Ocean Copepods |
genre_facet |
Antarc* Antarctic Antarctic Krill Euphausia superba Scotia Sea Southern Ocean Copepods |
op_relation |
https://oceanrep.geomar.de/id/eprint/21752/1/1411.pdf Schmidt, K., Atkinson, A., Steigenberger, S., Fielding, S., Lindsay, M. C. M., Pond, D. W., Tarling, G. A., Klevjer, T. A., Allen, C. S., Nicol, S. and Achterberg, E. P. (2011) Seabed foraging by antarctic krill: Implications for stock assessment, bentho-pelagic coupling, and the vertical transfer of iron. Limnology and Oceanography, 56 (4). pp. 1411-1428. DOI 10.4319/lo.2011.56.4.1411 <https://doi.org/10.4319/lo.2011.56.4.1411>. doi:10.4319/lo.2011.56.4.1411 |
op_doi |
https://doi.org/10.4319/lo.2011.56.4.1411 |
container_title |
Limnology and Oceanography |
container_volume |
56 |
container_issue |
4 |
container_start_page |
1411 |
op_container_end_page |
1428 |
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1766260134470746112 |