Two scales of distribution and biomass of Antarctic krill (Euphausia superba) in the eastern sector of the CCAMLR Division 58.4.2 (55°E to 80°E).
Regular monitoring is an important component of the successful management of pelagic animals of interest to commercial fisheries. Here we provide a biomass estimate for Antarctic krill (Euphausia superba) in the eastern sector of the Commission for the Conservation of Antarctic Marine Living Resourc...
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ftdoajarticles:oai:doaj.org/article:043db0e2180744159deef1e00f61a3c4 2023-05-15T13:36:02+02:00 Two scales of distribution and biomass of Antarctic krill (Euphausia superba) in the eastern sector of the CCAMLR Division 58.4.2 (55°E to 80°E). Martin J Cox Gavin Macaulay Madeleine J Brasier Alicia Burns Olivia J Johnson Rob King Dale Maschette Jessica Melvin Abigail J R Smith Christine K Weldrick Simon Wotherspoon So Kawaguchi 2022-01-01T00:00:00Z https://doi.org/10.1371/journal.pone.0271078 https://doaj.org/article/043db0e2180744159deef1e00f61a3c4 EN eng Public Library of Science (PLoS) https://doi.org/10.1371/journal.pone.0271078 https://doaj.org/toc/1932-6203 1932-6203 doi:10.1371/journal.pone.0271078 https://doaj.org/article/043db0e2180744159deef1e00f61a3c4 PLoS ONE, Vol 17, Iss 8, p e0271078 (2022) Medicine R Science Q article 2022 ftdoajarticles https://doi.org/10.1371/journal.pone.0271078 2022-12-30T20:11:50Z Regular monitoring is an important component of the successful management of pelagic animals of interest to commercial fisheries. Here we provide a biomass estimate for Antarctic krill (Euphausia superba) in the eastern sector of the Commission for the Conservation of Antarctic Marine Living Resources (CCAMLR) Division 58.4.2 (55°E to 80°E; area = 775,732 km2) using data collected during an acoustic-trawl survey carried out in February and March 2021. Using acoustic data collected in day-time and trawl data, areal biomass density was estimated as 8.3 gm-2 giving a total areal krill biomass of 6.48 million tonnes, with a 28.9% coefficient of variation (CV). The inaccessibility of the East Antarctic makes fisheries-independent surveys of Antarctic krill expensive and time consuming, so we also assessed the efficacy of extrapolating smaller surveys to a wider area. During the large-scale survey a smaller scale survey (centre coordinates -66.28°S 63.35°E, area = 4,902 km2) was conducted. We examine how representative krill densities from the small-scale (Mawson box) survey were over a latitudinal range by comparing krill densities from the large-scale survey split into latitudinal bands. We found the small scale survey provided a good representation of the statistical distribution of krill densities within its latitudinal band (KS-test, D = 0.048, p-value = 0.98), as well as mean density (t-test p-value = 0.44), but not outside of the band. We recommend further in situ testing of this approach. Article in Journal/Newspaper Antarc* Antarctic Antarctic Krill Euphausia superba Directory of Open Access Journals: DOAJ Articles Antarctic PLOS ONE 17 8 e0271078 |
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 Martin J Cox Gavin Macaulay Madeleine J Brasier Alicia Burns Olivia J Johnson Rob King Dale Maschette Jessica Melvin Abigail J R Smith Christine K Weldrick Simon Wotherspoon So Kawaguchi Two scales of distribution and biomass of Antarctic krill (Euphausia superba) in the eastern sector of the CCAMLR Division 58.4.2 (55°E to 80°E). |
topic_facet |
Medicine R Science Q |
description |
Regular monitoring is an important component of the successful management of pelagic animals of interest to commercial fisheries. Here we provide a biomass estimate for Antarctic krill (Euphausia superba) in the eastern sector of the Commission for the Conservation of Antarctic Marine Living Resources (CCAMLR) Division 58.4.2 (55°E to 80°E; area = 775,732 km2) using data collected during an acoustic-trawl survey carried out in February and March 2021. Using acoustic data collected in day-time and trawl data, areal biomass density was estimated as 8.3 gm-2 giving a total areal krill biomass of 6.48 million tonnes, with a 28.9% coefficient of variation (CV). The inaccessibility of the East Antarctic makes fisheries-independent surveys of Antarctic krill expensive and time consuming, so we also assessed the efficacy of extrapolating smaller surveys to a wider area. During the large-scale survey a smaller scale survey (centre coordinates -66.28°S 63.35°E, area = 4,902 km2) was conducted. We examine how representative krill densities from the small-scale (Mawson box) survey were over a latitudinal range by comparing krill densities from the large-scale survey split into latitudinal bands. We found the small scale survey provided a good representation of the statistical distribution of krill densities within its latitudinal band (KS-test, D = 0.048, p-value = 0.98), as well as mean density (t-test p-value = 0.44), but not outside of the band. We recommend further in situ testing of this approach. |
format |
Article in Journal/Newspaper |
author |
Martin J Cox Gavin Macaulay Madeleine J Brasier Alicia Burns Olivia J Johnson Rob King Dale Maschette Jessica Melvin Abigail J R Smith Christine K Weldrick Simon Wotherspoon So Kawaguchi |
author_facet |
Martin J Cox Gavin Macaulay Madeleine J Brasier Alicia Burns Olivia J Johnson Rob King Dale Maschette Jessica Melvin Abigail J R Smith Christine K Weldrick Simon Wotherspoon So Kawaguchi |
author_sort |
Martin J Cox |
title |
Two scales of distribution and biomass of Antarctic krill (Euphausia superba) in the eastern sector of the CCAMLR Division 58.4.2 (55°E to 80°E). |
title_short |
Two scales of distribution and biomass of Antarctic krill (Euphausia superba) in the eastern sector of the CCAMLR Division 58.4.2 (55°E to 80°E). |
title_full |
Two scales of distribution and biomass of Antarctic krill (Euphausia superba) in the eastern sector of the CCAMLR Division 58.4.2 (55°E to 80°E). |
title_fullStr |
Two scales of distribution and biomass of Antarctic krill (Euphausia superba) in the eastern sector of the CCAMLR Division 58.4.2 (55°E to 80°E). |
title_full_unstemmed |
Two scales of distribution and biomass of Antarctic krill (Euphausia superba) in the eastern sector of the CCAMLR Division 58.4.2 (55°E to 80°E). |
title_sort |
two scales of distribution and biomass of antarctic krill (euphausia superba) in the eastern sector of the ccamlr division 58.4.2 (55°e to 80°e). |
publisher |
Public Library of Science (PLoS) |
publishDate |
2022 |
url |
https://doi.org/10.1371/journal.pone.0271078 https://doaj.org/article/043db0e2180744159deef1e00f61a3c4 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic Antarctic Krill Euphausia superba |
genre_facet |
Antarc* Antarctic Antarctic Krill Euphausia superba |
op_source |
PLoS ONE, Vol 17, Iss 8, p e0271078 (2022) |
op_relation |
https://doi.org/10.1371/journal.pone.0271078 https://doaj.org/toc/1932-6203 1932-6203 doi:10.1371/journal.pone.0271078 https://doaj.org/article/043db0e2180744159deef1e00f61a3c4 |
op_doi |
https://doi.org/10.1371/journal.pone.0271078 |
container_title |
PLOS ONE |
container_volume |
17 |
container_issue |
8 |
container_start_page |
e0271078 |
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1766073587566903296 |