Summer distribution and demography of Antarctic krill Euphausia superba Dana, 1852 (Euphausiacea) at the South Orkney Islands, 2011–2015
We carried out a survey of Antarctic krill (Euphausia superba Dana, 1850) from 2011 to 2015 to establish a long-term, time-series dataset of distribution, abundance, and demography for this species in the South Orkney Islands sector of the Southern Ocean. This species is abundant in this region and...
Published in: | Journal of Crustacean Biology |
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Language: | English |
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2018
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Online Access: | https://orbit.dtu.dk/en/publications/404de510-96a5-4b56-8abb-ee7e0b907684 https://doi.org/10.1093/jcbiol/ruy061 https://backend.orbit.dtu.dk/ws/files/185057559/untitled.pdf |
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ftdtupubl:oai:pure.atira.dk:publications/404de510-96a5-4b56-8abb-ee7e0b907684 2024-04-28T07:57:04+00:00 Summer distribution and demography of Antarctic krill Euphausia superba Dana, 1852 (Euphausiacea) at the South Orkney Islands, 2011–2015 Krafft, Bjørn A. Krag, Ludvig Ahm Knutsen, Tor Skaret, Georg Jensen, Knut H. M. Krakstad, Jens O. Larsen, Stuart H. Melle, Webjørn Iversen, Svein A. Godø, Olav R. 2018 application/pdf https://orbit.dtu.dk/en/publications/404de510-96a5-4b56-8abb-ee7e0b907684 https://doi.org/10.1093/jcbiol/ruy061 https://backend.orbit.dtu.dk/ws/files/185057559/untitled.pdf eng eng https://orbit.dtu.dk/en/publications/404de510-96a5-4b56-8abb-ee7e0b907684 info:eu-repo/semantics/openAccess Krafft , B A , Krag , L A , Knutsen , T , Skaret , G , Jensen , K H M , Krakstad , J O , Larsen , S H , Melle , W , Iversen , S A & Godø , O R 2018 , ' Summer distribution and demography of Antarctic krill Euphausia superba Dana, 1852 (Euphausiacea) at the South Orkney Islands, 2011–2015 ' , Journal of Crustacean Biology , vol. 38 , no. 6 , pp. 682-688 . https://doi.org/10.1093/jcbiol/ruy061 Fisheries Maturity stage Southern Ocean Time series Zooplankton /dk/atira/pure/sustainabledevelopmentgoals/life_below_water name=SDG 14 - Life Below Water article 2018 ftdtupubl https://doi.org/10.1093/jcbiol/ruy061 2024-04-10T14:37:30Z We carried out a survey of Antarctic krill (Euphausia superba Dana, 1850) from 2011 to 2015 to establish a long-term, time-series dataset of distribution, abundance, and demography for this species in the South Orkney Islands sector of the Southern Ocean. This species is abundant in this region and is subjected to high-intensity fishing, but previous assessments of density and population dynamics are few and outdated. Our data for Antarctic krill was collected from trawl stations along survey line transects covering the South Orkney plateau and shelf region during the summers of five consecutive years. We used concurrent data on hydrography, bathymetry, and proxies for algal biomass to describe potential spatial patterns of demography and abundance of E. superba. Comparative analysis of the demographic composition showed that 2012 differed from the other years by having a higher proportion of juveniles; otherwise a consistent pattern was found among years and within the study area. The highest biomass during the study period occurred along the northern shelf edge of the South Orkney Islands. Results of the linear mixed-effect model used to evaluate a diverse range of variables revealed that the only predictors for this hotspot were the short distance from land and great bottom depth. No clear differences in demographic composition for the study area were detected, which indicates that the area is highly dynamic and dominated by flux and advection of krill, both to, from, and within the area. Despite this finding, the results demonstrate that the shelf break on the northwest South Orkney Islands is predictable over time as a krill concentration and retention hotspot during the summer season Article in Journal/Newspaper Antarc* Antarctic Antarctic Krill Euphausia superba South Orkney Islands Southern Ocean Technical University of Denmark: DTU Orbit Journal of Crustacean Biology 38 6 682 688 |
institution |
Open Polar |
collection |
Technical University of Denmark: DTU Orbit |
op_collection_id |
ftdtupubl |
language |
English |
topic |
Fisheries Maturity stage Southern Ocean Time series Zooplankton /dk/atira/pure/sustainabledevelopmentgoals/life_below_water name=SDG 14 - Life Below Water |
spellingShingle |
Fisheries Maturity stage Southern Ocean Time series Zooplankton /dk/atira/pure/sustainabledevelopmentgoals/life_below_water name=SDG 14 - Life Below Water Krafft, Bjørn A. Krag, Ludvig Ahm Knutsen, Tor Skaret, Georg Jensen, Knut H. M. Krakstad, Jens O. Larsen, Stuart H. Melle, Webjørn Iversen, Svein A. Godø, Olav R. Summer distribution and demography of Antarctic krill Euphausia superba Dana, 1852 (Euphausiacea) at the South Orkney Islands, 2011–2015 |
topic_facet |
Fisheries Maturity stage Southern Ocean Time series Zooplankton /dk/atira/pure/sustainabledevelopmentgoals/life_below_water name=SDG 14 - Life Below Water |
description |
We carried out a survey of Antarctic krill (Euphausia superba Dana, 1850) from 2011 to 2015 to establish a long-term, time-series dataset of distribution, abundance, and demography for this species in the South Orkney Islands sector of the Southern Ocean. This species is abundant in this region and is subjected to high-intensity fishing, but previous assessments of density and population dynamics are few and outdated. Our data for Antarctic krill was collected from trawl stations along survey line transects covering the South Orkney plateau and shelf region during the summers of five consecutive years. We used concurrent data on hydrography, bathymetry, and proxies for algal biomass to describe potential spatial patterns of demography and abundance of E. superba. Comparative analysis of the demographic composition showed that 2012 differed from the other years by having a higher proportion of juveniles; otherwise a consistent pattern was found among years and within the study area. The highest biomass during the study period occurred along the northern shelf edge of the South Orkney Islands. Results of the linear mixed-effect model used to evaluate a diverse range of variables revealed that the only predictors for this hotspot were the short distance from land and great bottom depth. No clear differences in demographic composition for the study area were detected, which indicates that the area is highly dynamic and dominated by flux and advection of krill, both to, from, and within the area. Despite this finding, the results demonstrate that the shelf break on the northwest South Orkney Islands is predictable over time as a krill concentration and retention hotspot during the summer season |
format |
Article in Journal/Newspaper |
author |
Krafft, Bjørn A. Krag, Ludvig Ahm Knutsen, Tor Skaret, Georg Jensen, Knut H. M. Krakstad, Jens O. Larsen, Stuart H. Melle, Webjørn Iversen, Svein A. Godø, Olav R. |
author_facet |
Krafft, Bjørn A. Krag, Ludvig Ahm Knutsen, Tor Skaret, Georg Jensen, Knut H. M. Krakstad, Jens O. Larsen, Stuart H. Melle, Webjørn Iversen, Svein A. Godø, Olav R. |
author_sort |
Krafft, Bjørn A. |
title |
Summer distribution and demography of Antarctic krill Euphausia superba Dana, 1852 (Euphausiacea) at the South Orkney Islands, 2011–2015 |
title_short |
Summer distribution and demography of Antarctic krill Euphausia superba Dana, 1852 (Euphausiacea) at the South Orkney Islands, 2011–2015 |
title_full |
Summer distribution and demography of Antarctic krill Euphausia superba Dana, 1852 (Euphausiacea) at the South Orkney Islands, 2011–2015 |
title_fullStr |
Summer distribution and demography of Antarctic krill Euphausia superba Dana, 1852 (Euphausiacea) at the South Orkney Islands, 2011–2015 |
title_full_unstemmed |
Summer distribution and demography of Antarctic krill Euphausia superba Dana, 1852 (Euphausiacea) at the South Orkney Islands, 2011–2015 |
title_sort |
summer distribution and demography of antarctic krill euphausia superba dana, 1852 (euphausiacea) at the south orkney islands, 2011–2015 |
publishDate |
2018 |
url |
https://orbit.dtu.dk/en/publications/404de510-96a5-4b56-8abb-ee7e0b907684 https://doi.org/10.1093/jcbiol/ruy061 https://backend.orbit.dtu.dk/ws/files/185057559/untitled.pdf |
genre |
Antarc* Antarctic Antarctic Krill Euphausia superba South Orkney Islands Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctic Krill Euphausia superba South Orkney Islands Southern Ocean |
op_source |
Krafft , B A , Krag , L A , Knutsen , T , Skaret , G , Jensen , K H M , Krakstad , J O , Larsen , S H , Melle , W , Iversen , S A & Godø , O R 2018 , ' Summer distribution and demography of Antarctic krill Euphausia superba Dana, 1852 (Euphausiacea) at the South Orkney Islands, 2011–2015 ' , Journal of Crustacean Biology , vol. 38 , no. 6 , pp. 682-688 . https://doi.org/10.1093/jcbiol/ruy061 |
op_relation |
https://orbit.dtu.dk/en/publications/404de510-96a5-4b56-8abb-ee7e0b907684 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1093/jcbiol/ruy061 |
container_title |
Journal of Crustacean Biology |
container_volume |
38 |
container_issue |
6 |
container_start_page |
682 |
op_container_end_page |
688 |
_version_ |
1797586542396440576 |