Improving the accuracy of krill target strength using a shape catalog
Antarctic krill are subject to precautionary catch limits, based on biomass estimates, to ensure human activities do not adversely impact their important ecological role. Accurate target strength models of individual krill underpin biomass estimates. These models are scaled using measured and estima...
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Online Access: | https://doi.org/10.3389/fmars.2021.658384 https://www.openagrar.de/receive/openagrar_mods_00076695 https://www.openagrar.de/servlets/MCRFileNodeServlet/openagrar_derivate_00043756/dn064334.pdf |
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ftopenagrar:oai:www.openagrar.de:openagrar_mods_00076695 2024-09-09T19:10:18+00:00 Improving the accuracy of krill target strength using a shape catalog Bairstow, Fiona Gastauer, Sven Finley, Luke A. Edwards, Tom Brown, C. Tom A. Kawaguchi, So Cox, Martin J. 2021-04-07 https://doi.org/10.3389/fmars.2021.658384 https://www.openagrar.de/receive/openagrar_mods_00076695 https://www.openagrar.de/servlets/MCRFileNodeServlet/openagrar_derivate_00043756/dn064334.pdf eng eng Frontiers in marine science -- Front. Mar. Sci -- 2296-7745 -- 2757748-X https://doi.org/10.3389/fmars.2021.658384 https://www.openagrar.de/receive/openagrar_mods_00076695 https://www.openagrar.de/servlets/MCRFileNodeServlet/openagrar_derivate_00043756/dn064334.pdf public https://creativecommons.org/licenses/by/4.0/ info:eu-repo/semantics/openAccess Text article ddc:570 Antarctic krill -- Euphausia superba -- morphometrics -- target strength -- acoustic scattering article Text doc-type:article 2021 ftopenagrar https://doi.org/10.3389/fmars.2021.658384 2024-07-15T23:39:28Z Antarctic krill are subject to precautionary catch limits, based on biomass estimates, to ensure human activities do not adversely impact their important ecological role. Accurate target strength models of individual krill underpin biomass estimates. These models are scaled using measured and estimated distributions of length and orientation. However, while the length distribution of a krill swarm is accessible from net samples, there is currently limited consensus on the method for estimating krill orientation distribution. This leads to a limiting factor in biomass calculations. In this work, we consider geometric shape as a variable in target strength calculations and describe a practical method for generating a catalog of krill shapes. A catalog of shapes produces a more variable target strength response than an equivalent population of a scaled generic shape. Furthermore, using a shape catalog has the greatest impact on backscattering cross-section (linearized target strength) where the dominant scattering mechanism is mie scattering, irrespective of orientation distribution weighting. We suggest that shape distributions should be used in addition to length and orientation distributions to improve the accuracy of krill biomass estimates. Article in Journal/Newspaper Antarc* Antarctic Antarctic Krill Euphausia superba OpenAgrar (OA) Antarctic Frontiers in Marine Science 8 |
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ftopenagrar |
language |
English |
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Text article ddc:570 Antarctic krill -- Euphausia superba -- morphometrics -- target strength -- acoustic scattering |
spellingShingle |
Text article ddc:570 Antarctic krill -- Euphausia superba -- morphometrics -- target strength -- acoustic scattering Bairstow, Fiona Gastauer, Sven Finley, Luke A. Edwards, Tom Brown, C. Tom A. Kawaguchi, So Cox, Martin J. Improving the accuracy of krill target strength using a shape catalog |
topic_facet |
Text article ddc:570 Antarctic krill -- Euphausia superba -- morphometrics -- target strength -- acoustic scattering |
description |
Antarctic krill are subject to precautionary catch limits, based on biomass estimates, to ensure human activities do not adversely impact their important ecological role. Accurate target strength models of individual krill underpin biomass estimates. These models are scaled using measured and estimated distributions of length and orientation. However, while the length distribution of a krill swarm is accessible from net samples, there is currently limited consensus on the method for estimating krill orientation distribution. This leads to a limiting factor in biomass calculations. In this work, we consider geometric shape as a variable in target strength calculations and describe a practical method for generating a catalog of krill shapes. A catalog of shapes produces a more variable target strength response than an equivalent population of a scaled generic shape. Furthermore, using a shape catalog has the greatest impact on backscattering cross-section (linearized target strength) where the dominant scattering mechanism is mie scattering, irrespective of orientation distribution weighting. We suggest that shape distributions should be used in addition to length and orientation distributions to improve the accuracy of krill biomass estimates. |
format |
Article in Journal/Newspaper |
author |
Bairstow, Fiona Gastauer, Sven Finley, Luke A. Edwards, Tom Brown, C. Tom A. Kawaguchi, So Cox, Martin J. |
author_facet |
Bairstow, Fiona Gastauer, Sven Finley, Luke A. Edwards, Tom Brown, C. Tom A. Kawaguchi, So Cox, Martin J. |
author_sort |
Bairstow, Fiona |
title |
Improving the accuracy of krill target strength using a shape catalog |
title_short |
Improving the accuracy of krill target strength using a shape catalog |
title_full |
Improving the accuracy of krill target strength using a shape catalog |
title_fullStr |
Improving the accuracy of krill target strength using a shape catalog |
title_full_unstemmed |
Improving the accuracy of krill target strength using a shape catalog |
title_sort |
improving the accuracy of krill target strength using a shape catalog |
publishDate |
2021 |
url |
https://doi.org/10.3389/fmars.2021.658384 https://www.openagrar.de/receive/openagrar_mods_00076695 https://www.openagrar.de/servlets/MCRFileNodeServlet/openagrar_derivate_00043756/dn064334.pdf |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic Antarctic Krill Euphausia superba |
genre_facet |
Antarc* Antarctic Antarctic Krill Euphausia superba |
op_relation |
Frontiers in marine science -- Front. Mar. Sci -- 2296-7745 -- 2757748-X https://doi.org/10.3389/fmars.2021.658384 https://www.openagrar.de/receive/openagrar_mods_00076695 https://www.openagrar.de/servlets/MCRFileNodeServlet/openagrar_derivate_00043756/dn064334.pdf |
op_rights |
public https://creativecommons.org/licenses/by/4.0/ info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.3389/fmars.2021.658384 |
container_title |
Frontiers in Marine Science |
container_volume |
8 |
_version_ |
1809825115049820160 |