Inverse method applied to autonomous broadband hydroacoustic survey detects higher densities of zooplankton in near-surface aggregations than vessel-based net survey
Throughout all oceans, aggregations of zooplankton and ichthyoplankton appear as horizontal sound scattering layers (SSLs) when detected with active acoustic techniques. Quantifying the composition and density of these layers is prone to sampling biases. We conducted a net and trawl survey of the ep...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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Canadian Science Publishing
2023
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ftarchimer:oai:archimer.ifremer.fr:91614 2023-10-09T21:54:27+02:00 Inverse method applied to autonomous broadband hydroacoustic survey detects higher densities of zooplankton in near-surface aggregations than vessel-based net survey Dunn, Muriel Pedersen, Geir Basedow, Sünnje L. Daase, Malin Falk-petersen, Stig Bachelot, Loic Camus, Lionel Geoffroy, Maxime 2023-03 application/pdf https://archimer.ifremer.fr/doc/00804/91614/97597.pdf https://archimer.ifremer.fr/doc/00804/91614/100325.pdf https://doi.org/10.1139/cjfas-2022-0105 https://archimer.ifremer.fr/doc/00804/91614/ eng eng Canadian Science Publishing https://archimer.ifremer.fr/doc/00804/91614/97597.pdf https://archimer.ifremer.fr/doc/00804/91614/100325.pdf doi:10.1139/cjfas-2022-0105 https://archimer.ifremer.fr/doc/00804/91614/ info:eu-repo/semantics/openAccess restricted use Canadian Journal Of Fisheries And Aquatic Sciences (0706-652X) (Canadian Science Publishing), 2023-03 , Vol. 80 , N. 3 , P. 451-467 broadband acoustics inversion machine learning autonomous surface vehicle zooplankton text Article info:eu-repo/semantics/article 2023 ftarchimer https://doi.org/10.1139/cjfas-2022-0105 2023-09-19T22:51:07Z Throughout all oceans, aggregations of zooplankton and ichthyoplankton appear as horizontal sound scattering layers (SSLs) when detected with active acoustic techniques. Quantifying the composition and density of these layers is prone to sampling biases. We conducted a net and trawl survey of the epipelagic fauna in northern Norway (70˚N) in June 2018 while an autonomous surface vehicle equipped with a broadband echosounder (283-383 kHz) surveyed the same region. Densities from the autonomous hydroacoustic survey were calculated using forward estimates from the relative density from the net and trawl, and inversion estimates with statistical data-fitting. All four methods (net, trawl, acoustic forward and inverse methods) identified that copepods dominated the epipelagic SSL, while pteropods, amphipods and fish larvae were present in low densities. The density estimates calculated with the inverse method were higher for mobile zooplankton, such as euphausiid larvae, than with the other methods. We concluded that the inverse method applied to broadband autonomous acoustic surveys can improve density estimates of epipelagic organisms by diminishing avoidance biases and increasing the spatio-temporal resolution of ship-based surveys. Article in Journal/Newspaper Northern Norway Copepods Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Norway Canadian Journal of Fisheries and Aquatic Sciences |
institution |
Open Polar |
collection |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
topic |
broadband acoustics inversion machine learning autonomous surface vehicle zooplankton |
spellingShingle |
broadband acoustics inversion machine learning autonomous surface vehicle zooplankton Dunn, Muriel Pedersen, Geir Basedow, Sünnje L. Daase, Malin Falk-petersen, Stig Bachelot, Loic Camus, Lionel Geoffroy, Maxime Inverse method applied to autonomous broadband hydroacoustic survey detects higher densities of zooplankton in near-surface aggregations than vessel-based net survey |
topic_facet |
broadband acoustics inversion machine learning autonomous surface vehicle zooplankton |
description |
Throughout all oceans, aggregations of zooplankton and ichthyoplankton appear as horizontal sound scattering layers (SSLs) when detected with active acoustic techniques. Quantifying the composition and density of these layers is prone to sampling biases. We conducted a net and trawl survey of the epipelagic fauna in northern Norway (70˚N) in June 2018 while an autonomous surface vehicle equipped with a broadband echosounder (283-383 kHz) surveyed the same region. Densities from the autonomous hydroacoustic survey were calculated using forward estimates from the relative density from the net and trawl, and inversion estimates with statistical data-fitting. All four methods (net, trawl, acoustic forward and inverse methods) identified that copepods dominated the epipelagic SSL, while pteropods, amphipods and fish larvae were present in low densities. The density estimates calculated with the inverse method were higher for mobile zooplankton, such as euphausiid larvae, than with the other methods. We concluded that the inverse method applied to broadband autonomous acoustic surveys can improve density estimates of epipelagic organisms by diminishing avoidance biases and increasing the spatio-temporal resolution of ship-based surveys. |
format |
Article in Journal/Newspaper |
author |
Dunn, Muriel Pedersen, Geir Basedow, Sünnje L. Daase, Malin Falk-petersen, Stig Bachelot, Loic Camus, Lionel Geoffroy, Maxime |
author_facet |
Dunn, Muriel Pedersen, Geir Basedow, Sünnje L. Daase, Malin Falk-petersen, Stig Bachelot, Loic Camus, Lionel Geoffroy, Maxime |
author_sort |
Dunn, Muriel |
title |
Inverse method applied to autonomous broadband hydroacoustic survey detects higher densities of zooplankton in near-surface aggregations than vessel-based net survey |
title_short |
Inverse method applied to autonomous broadband hydroacoustic survey detects higher densities of zooplankton in near-surface aggregations than vessel-based net survey |
title_full |
Inverse method applied to autonomous broadband hydroacoustic survey detects higher densities of zooplankton in near-surface aggregations than vessel-based net survey |
title_fullStr |
Inverse method applied to autonomous broadband hydroacoustic survey detects higher densities of zooplankton in near-surface aggregations than vessel-based net survey |
title_full_unstemmed |
Inverse method applied to autonomous broadband hydroacoustic survey detects higher densities of zooplankton in near-surface aggregations than vessel-based net survey |
title_sort |
inverse method applied to autonomous broadband hydroacoustic survey detects higher densities of zooplankton in near-surface aggregations than vessel-based net survey |
publisher |
Canadian Science Publishing |
publishDate |
2023 |
url |
https://archimer.ifremer.fr/doc/00804/91614/97597.pdf https://archimer.ifremer.fr/doc/00804/91614/100325.pdf https://doi.org/10.1139/cjfas-2022-0105 https://archimer.ifremer.fr/doc/00804/91614/ |
geographic |
Norway |
geographic_facet |
Norway |
genre |
Northern Norway Copepods |
genre_facet |
Northern Norway Copepods |
op_source |
Canadian Journal Of Fisheries And Aquatic Sciences (0706-652X) (Canadian Science Publishing), 2023-03 , Vol. 80 , N. 3 , P. 451-467 |
op_relation |
https://archimer.ifremer.fr/doc/00804/91614/97597.pdf https://archimer.ifremer.fr/doc/00804/91614/100325.pdf doi:10.1139/cjfas-2022-0105 https://archimer.ifremer.fr/doc/00804/91614/ |
op_rights |
info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1139/cjfas-2022-0105 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
_version_ |
1779318024328708096 |