Antarctic krill swarm characteristics in the Southeast Atlantic sector of the Southern Ocean
Knowledge about swarm dynamics and underlying causes is essential to understand the ecology and distribution of Antarctic krill Euphausia superba. We collected acoustic data and key environmental data continuously across extensive gradients in the little-studied Southeast Atlantic sector of the Sout...
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Online Access: | http://hdl.handle.net/10754/555782 https://doi.org/10.3354/meps09876 |
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ftkingabdullahun:oai:repository.kaust.edu.sa:10754/555782 2023-12-31T09:59:51+01:00 Antarctic krill swarm characteristics in the Southeast Atlantic sector of the Southern Ocean Krafft, BA Skaret, G Knutsen, T Melle, W Klevjer, Thor Aleksander Søiland, H Red Sea Research Center (RSRC) Institute of Marine Research, 5870 Bergen, Norway Department of Biology, University of Oslo, 0316 Oslo, Norway 2012-09-28 application/pdf http://hdl.handle.net/10754/555782 https://doi.org/10.3354/meps09876 unknown Inter-Research Science Center http://www.int-res.com/abstracts/meps/v465/p69-83/ Antarctic krill swarm characteristics in the Southeast Atlantic sector of the Southern Ocean 2012, 465:69 Marine Ecology Progress Series doi:10.3354/meps09876 0171-8630 1616-1599 Marine Ecology Progress Series http://hdl.handle.net/10754/555782 Archived with thanks to Marine Ecology Progress Series Euphausia superba Aggregation Acoustics Swarm Bouvetøya Article 2012 ftkingabdullahun https://doi.org/10.3354/meps09876 2023-12-02T20:18:10Z Knowledge about swarm dynamics and underlying causes is essential to understand the ecology and distribution of Antarctic krill Euphausia superba. We collected acoustic data and key environmental data continuously across extensive gradients in the little-studied Southeast Atlantic sector of the Southern Ocean. A total of 4791 krill swarms with swarm descriptors including swarm height and length, packing density, swimming depth and inter-swarm distance were extracted. Through multivariate statistics, swarms were categorized into 4 groups. Group 2 swarms were largest (median length 108 m and thickness 18 m), whereas swarms in both Groups 1 and 4 were on average small, but differed markedly in depth distribution (median: 52 m for Group 1 vs. 133 m for Group 4). There was a strong spatial autocorrelation in the occurrence of swarms, and an autologistic regression model found no prediction of swarm occurrence from environmental variables for any of the Groups 1, 2 or 4. Probability of occurrence of Group 3 swarms, however, increased with increasing depth and temperature. Group 3 was the most distinctive swarm group with an order of magnitude higher packing density (median: 226 ind. m−3) than swarms from any of the other groups and about twice the distance to nearest neighbor swarm (median: 493 m). The majority of the krill were present in Group 3 swarms, and the absence of association with hydrographic or topographic concentrating mechanisms strongly suggests that these swarms aggregate through their own locomotion, possibly associated with migration. Article in Journal/Newspaper Antarc* Antarctic Antarctic Krill Bouvetøya Euphausia superba Southern Ocean King Abdullah University of Science and Technology: KAUST Repository Marine Ecology Progress Series 465 69 83 |
institution |
Open Polar |
collection |
King Abdullah University of Science and Technology: KAUST Repository |
op_collection_id |
ftkingabdullahun |
language |
unknown |
topic |
Euphausia superba Aggregation Acoustics Swarm Bouvetøya |
spellingShingle |
Euphausia superba Aggregation Acoustics Swarm Bouvetøya Krafft, BA Skaret, G Knutsen, T Melle, W Klevjer, Thor Aleksander Søiland, H Antarctic krill swarm characteristics in the Southeast Atlantic sector of the Southern Ocean |
topic_facet |
Euphausia superba Aggregation Acoustics Swarm Bouvetøya |
description |
Knowledge about swarm dynamics and underlying causes is essential to understand the ecology and distribution of Antarctic krill Euphausia superba. We collected acoustic data and key environmental data continuously across extensive gradients in the little-studied Southeast Atlantic sector of the Southern Ocean. A total of 4791 krill swarms with swarm descriptors including swarm height and length, packing density, swimming depth and inter-swarm distance were extracted. Through multivariate statistics, swarms were categorized into 4 groups. Group 2 swarms were largest (median length 108 m and thickness 18 m), whereas swarms in both Groups 1 and 4 were on average small, but differed markedly in depth distribution (median: 52 m for Group 1 vs. 133 m for Group 4). There was a strong spatial autocorrelation in the occurrence of swarms, and an autologistic regression model found no prediction of swarm occurrence from environmental variables for any of the Groups 1, 2 or 4. Probability of occurrence of Group 3 swarms, however, increased with increasing depth and temperature. Group 3 was the most distinctive swarm group with an order of magnitude higher packing density (median: 226 ind. m−3) than swarms from any of the other groups and about twice the distance to nearest neighbor swarm (median: 493 m). The majority of the krill were present in Group 3 swarms, and the absence of association with hydrographic or topographic concentrating mechanisms strongly suggests that these swarms aggregate through their own locomotion, possibly associated with migration. |
author2 |
Red Sea Research Center (RSRC) Institute of Marine Research, 5870 Bergen, Norway Department of Biology, University of Oslo, 0316 Oslo, Norway |
format |
Article in Journal/Newspaper |
author |
Krafft, BA Skaret, G Knutsen, T Melle, W Klevjer, Thor Aleksander Søiland, H |
author_facet |
Krafft, BA Skaret, G Knutsen, T Melle, W Klevjer, Thor Aleksander Søiland, H |
author_sort |
Krafft, BA |
title |
Antarctic krill swarm characteristics in the Southeast Atlantic sector of the Southern Ocean |
title_short |
Antarctic krill swarm characteristics in the Southeast Atlantic sector of the Southern Ocean |
title_full |
Antarctic krill swarm characteristics in the Southeast Atlantic sector of the Southern Ocean |
title_fullStr |
Antarctic krill swarm characteristics in the Southeast Atlantic sector of the Southern Ocean |
title_full_unstemmed |
Antarctic krill swarm characteristics in the Southeast Atlantic sector of the Southern Ocean |
title_sort |
antarctic krill swarm characteristics in the southeast atlantic sector of the southern ocean |
publisher |
Inter-Research Science Center |
publishDate |
2012 |
url |
http://hdl.handle.net/10754/555782 https://doi.org/10.3354/meps09876 |
genre |
Antarc* Antarctic Antarctic Krill Bouvetøya Euphausia superba Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctic Krill Bouvetøya Euphausia superba Southern Ocean |
op_relation |
http://www.int-res.com/abstracts/meps/v465/p69-83/ Antarctic krill swarm characteristics in the Southeast Atlantic sector of the Southern Ocean 2012, 465:69 Marine Ecology Progress Series doi:10.3354/meps09876 0171-8630 1616-1599 Marine Ecology Progress Series http://hdl.handle.net/10754/555782 |
op_rights |
Archived with thanks to Marine Ecology Progress Series |
op_doi |
https://doi.org/10.3354/meps09876 |
container_title |
Marine Ecology Progress Series |
container_volume |
465 |
container_start_page |
69 |
op_container_end_page |
83 |
_version_ |
1786843036089581568 |