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...
Published in: | Frontiers in Marine Science |
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Main Authors: | , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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2021
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Online Access: | https://research-portal.st-andrews.ac.uk/en/researchoutput/improving-the-accuracy-of-krill-target-strength-using-a-shape-catalog(523db138-4215-44cc-be16-24f1cced1d65).html https://doi.org/10.3389/fmars.2021.658384 https://research-repository.st-andrews.ac.uk/bitstream/10023/21785/1/Bairstow_2021_FMS_Krill_CC.pdf |
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ftunstandrewcris:oai:research-portal.st-andrews.ac.uk:publications/523db138-4215-44cc-be16-24f1cced1d65 2024-06-23T07:47:57+00:00 Improving the accuracy of krill target strength using a shape catalog Bairstow, Fiona Jay Gastauer, Sven Finley, Luke Edwards, Tom Brown, C Tom A Kawaguchi, So Cox, Martin 2021-04-07 application/pdf https://research-portal.st-andrews.ac.uk/en/researchoutput/improving-the-accuracy-of-krill-target-strength-using-a-shape-catalog(523db138-4215-44cc-be16-24f1cced1d65).html https://doi.org/10.3389/fmars.2021.658384 https://research-repository.st-andrews.ac.uk/bitstream/10023/21785/1/Bairstow_2021_FMS_Krill_CC.pdf eng eng https://research-portal.st-andrews.ac.uk/en/researchoutput/improving-the-accuracy-of-krill-target-strength-using-a-shape-catalog(523db138-4215-44cc-be16-24f1cced1d65).html info:eu-repo/semantics/openAccess Bairstow , F J , Gastauer , S , Finley , L , Edwards , T , Brown , C T A , Kawaguchi , S & Cox , M 2021 , ' Improving the accuracy of krill target strength using a shape catalog ' , Frontiers in Marine Science , vol. 8 , 658384 . https://doi.org/10.3389/fmars.2021.658384 Antarctic krill Euphasia superba Morphometrics Target strength Acoustic scattering article 2021 ftunstandrewcris https://doi.org/10.3389/fmars.2021.658384 2024-06-13T01:14:55Z 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 University of St Andrews: Research Portal Antarctic Frontiers in Marine Science 8 |
institution |
Open Polar |
collection |
University of St Andrews: Research Portal |
op_collection_id |
ftunstandrewcris |
language |
English |
topic |
Antarctic krill Euphasia superba Morphometrics Target strength Acoustic scattering |
spellingShingle |
Antarctic krill Euphasia superba Morphometrics Target strength Acoustic scattering Bairstow, Fiona Jay Gastauer, Sven Finley, Luke Edwards, Tom Brown, C Tom A Kawaguchi, So Cox, Martin Improving the accuracy of krill target strength using a shape catalog |
topic_facet |
Antarctic krill Euphasia 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 Jay Gastauer, Sven Finley, Luke Edwards, Tom Brown, C Tom A Kawaguchi, So Cox, Martin |
author_facet |
Bairstow, Fiona Jay Gastauer, Sven Finley, Luke Edwards, Tom Brown, C Tom A Kawaguchi, So Cox, Martin |
author_sort |
Bairstow, Fiona Jay |
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://research-portal.st-andrews.ac.uk/en/researchoutput/improving-the-accuracy-of-krill-target-strength-using-a-shape-catalog(523db138-4215-44cc-be16-24f1cced1d65).html https://doi.org/10.3389/fmars.2021.658384 https://research-repository.st-andrews.ac.uk/bitstream/10023/21785/1/Bairstow_2021_FMS_Krill_CC.pdf |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic Antarctic Krill |
genre_facet |
Antarc* Antarctic Antarctic Krill |
op_source |
Bairstow , F J , Gastauer , S , Finley , L , Edwards , T , Brown , C T A , Kawaguchi , S & Cox , M 2021 , ' Improving the accuracy of krill target strength using a shape catalog ' , Frontiers in Marine Science , vol. 8 , 658384 . https://doi.org/10.3389/fmars.2021.658384 |
op_relation |
https://research-portal.st-andrews.ac.uk/en/researchoutput/improving-the-accuracy-of-krill-target-strength-using-a-shape-catalog(523db138-4215-44cc-be16-24f1cced1d65).html |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.3389/fmars.2021.658384 |
container_title |
Frontiers in Marine Science |
container_volume |
8 |
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1802638249283289088 |