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 |
---|---|
Main Authors: | , , , , , , |
Other Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
Frontiers Media SA
2021
|
Subjects: | |
Online Access: | http://dx.doi.org/10.3389/fmars.2021.658384 https://www.frontiersin.org/articles/10.3389/fmars.2021.658384/full |
id |
crfrontiers:10.3389/fmars.2021.658384 |
---|---|
record_format |
openpolar |
spelling |
crfrontiers:10.3389/fmars.2021.658384 2024-09-09T19:08:41+00:00 Improving the Accuracy of Krill Target Strength Using a Shape Catalog Bairstow, Fiona Gastauer, Sven Finley, Luke Edwards, Tom Brown, C. Tom A. Kawaguchi, So Cox, Martin J. Engineering and Physical Sciences Research Council Gordon and Betty Moore Foundation 2021 http://dx.doi.org/10.3389/fmars.2021.658384 https://www.frontiersin.org/articles/10.3389/fmars.2021.658384/full unknown Frontiers Media SA https://creativecommons.org/licenses/by/4.0/ Frontiers in Marine Science volume 8 ISSN 2296-7745 journal-article 2021 crfrontiers https://doi.org/10.3389/fmars.2021.658384 2024-07-30T04:05:29Z 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 Frontiers (Publisher) Antarctic Frontiers in Marine Science 8 |
institution |
Open Polar |
collection |
Frontiers (Publisher) |
op_collection_id |
crfrontiers |
language |
unknown |
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. |
author2 |
Engineering and Physical Sciences Research Council Gordon and Betty Moore Foundation |
format |
Article in Journal/Newspaper |
author |
Bairstow, Fiona Gastauer, Sven Finley, Luke Edwards, Tom Brown, C. Tom A. Kawaguchi, So Cox, Martin J. |
spellingShingle |
Bairstow, Fiona Gastauer, Sven Finley, Luke Edwards, Tom Brown, C. Tom A. Kawaguchi, So Cox, Martin J. Improving the Accuracy of Krill Target Strength Using a Shape Catalog |
author_facet |
Bairstow, Fiona Gastauer, Sven Finley, Luke 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 |
publisher |
Frontiers Media SA |
publishDate |
2021 |
url |
http://dx.doi.org/10.3389/fmars.2021.658384 https://www.frontiersin.org/articles/10.3389/fmars.2021.658384/full |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic Antarctic Krill |
genre_facet |
Antarc* Antarctic Antarctic Krill |
op_source |
Frontiers in Marine Science volume 8 ISSN 2296-7745 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.3389/fmars.2021.658384 |
container_title |
Frontiers in Marine Science |
container_volume |
8 |
_version_ |
1809822930010374144 |