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
2022
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Online Access: | https://hdl.handle.net/10037/28252 https://doi.org/10.1139/cjfas-2022-0105 |
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ftunivtroemsoe:oai:munin.uit.no:10037/28252 2023-05-15T17:43:29+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 Barbara Pedersen, Geir Basedow, Sünnje Linnéa Daase, Malin Falk-Petersen, Stig Bachelot, Loic Camus, Lionel Geoffroy, Maxime 2022-11-10 https://hdl.handle.net/10037/28252 https://doi.org/10.1139/cjfas-2022-0105 eng eng Canadian Science Publishing Canadian Journal of Fisheries and Aquatic Sciences Norges forskningsråd: 269188 Norges forskningsråd: 287043 Norges forskningsråd: 309512 Dunn MB, Pedersen G, Basedow SL, Daase M, Falk-Petersen S, Bachelot, Camus L, Geoffroy M. Inverse method applied to autonomous broadband hydroacoustic survey detects higher densities of zooplankton in near-surface aggregations than vessel-based net survey. Canadian Journal of Fisheries and Aquatic Sciences. 2022 FRIDAID 2104127 doi:10.1139/cjfas-2022-0105 0706-652X 1205-7533 https://hdl.handle.net/10037/28252 Attribution 4.0 International (CC BY 4.0) openAccess Copyright 2022 The Author(s) https://creativecommons.org/licenses/by/4.0 CC-BY Journal article Tidsskriftartikkel Peer reviewed publishedVersion 2022 ftunivtroemsoe https://doi.org/10.1139/cjfas-2022-0105 2023-01-19T00:03:05Z 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 University of Tromsø: Munin Open Research Archive Norway Canadian Journal of Fisheries and Aquatic Sciences |
institution |
Open Polar |
collection |
University of Tromsø: Munin Open Research Archive |
op_collection_id |
ftunivtroemsoe |
language |
English |
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 Barbara Pedersen, Geir Basedow, Sünnje Linnéa Daase, Malin Falk-Petersen, Stig Bachelot, Loic Camus, Lionel Geoffroy, Maxime |
spellingShingle |
Dunn, Muriel Barbara Pedersen, Geir Basedow, Sünnje Linnéa 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 |
author_facet |
Dunn, Muriel Barbara Pedersen, Geir Basedow, Sünnje Linnéa Daase, Malin Falk-Petersen, Stig Bachelot, Loic Camus, Lionel Geoffroy, Maxime |
author_sort |
Dunn, Muriel Barbara |
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 |
2022 |
url |
https://hdl.handle.net/10037/28252 https://doi.org/10.1139/cjfas-2022-0105 |
geographic |
Norway |
geographic_facet |
Norway |
genre |
Northern Norway Copepods |
genre_facet |
Northern Norway Copepods |
op_relation |
Canadian Journal of Fisheries and Aquatic Sciences Norges forskningsråd: 269188 Norges forskningsråd: 287043 Norges forskningsråd: 309512 Dunn MB, Pedersen G, Basedow SL, Daase M, Falk-Petersen S, Bachelot, Camus L, Geoffroy M. Inverse method applied to autonomous broadband hydroacoustic survey detects higher densities of zooplankton in near-surface aggregations than vessel-based net survey. Canadian Journal of Fisheries and Aquatic Sciences. 2022 FRIDAID 2104127 doi:10.1139/cjfas-2022-0105 0706-652X 1205-7533 https://hdl.handle.net/10037/28252 |
op_rights |
Attribution 4.0 International (CC BY 4.0) openAccess Copyright 2022 The Author(s) https://creativecommons.org/licenses/by/4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1139/cjfas-2022-0105 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
_version_ |
1766145570624241664 |