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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Online Access: | https://hal.science/hal-04203925 https://doi.org/10.1139/cjfas-2022-0105 |
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ftccsdartic:oai:HAL:hal-04203925v1 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 Infrastructures de Recherche et Systèmes d'Information (IRSI) Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER) 2023-03 https://hal.science/hal-04203925 https://doi.org/10.1139/cjfas-2022-0105 en eng HAL CCSD NRC Research Press info:eu-repo/semantics/altIdentifier/doi/10.1139/cjfas-2022-0105 hal-04203925 https://hal.science/hal-04203925 doi:10.1139/cjfas-2022-0105 ISSN: 0706-652X EISSN: 1205-7533 Canadian Journal of Fisheries and Aquatic Sciences https://hal.science/hal-04203925 Canadian Journal of Fisheries and Aquatic Sciences, 2023, 80 (3), pp.451-467. ⟨10.1139/cjfas-2022-0105⟩ [SDU]Sciences of the Universe [physics] [SDV]Life Sciences [q-bio] info:eu-repo/semantics/article Journal articles 2023 ftccsdartic https://doi.org/10.1139/cjfas-2022-0105 2023-09-23T22:52:41Z 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 Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Norway Canadian Journal of Fisheries and Aquatic Sciences 80 3 451 467 |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
[SDU]Sciences of the Universe [physics] [SDV]Life Sciences [q-bio] |
spellingShingle |
[SDU]Sciences of the Universe [physics] [SDV]Life Sciences [q-bio] 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 |
[SDU]Sciences of the Universe [physics] [SDV]Life Sciences [q-bio] |
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. |
author2 |
Infrastructures de Recherche et Systèmes d'Information (IRSI) Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER) |
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 |
HAL CCSD |
publishDate |
2023 |
url |
https://hal.science/hal-04203925 https://doi.org/10.1139/cjfas-2022-0105 |
geographic |
Norway |
geographic_facet |
Norway |
genre |
Northern Norway Copepods |
genre_facet |
Northern Norway Copepods |
op_source |
ISSN: 0706-652X EISSN: 1205-7533 Canadian Journal of Fisheries and Aquatic Sciences https://hal.science/hal-04203925 Canadian Journal of Fisheries and Aquatic Sciences, 2023, 80 (3), pp.451-467. ⟨10.1139/cjfas-2022-0105⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1139/cjfas-2022-0105 hal-04203925 https://hal.science/hal-04203925 doi:10.1139/cjfas-2022-0105 |
op_doi |
https://doi.org/10.1139/cjfas-2022-0105 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
80 |
container_issue |
3 |
container_start_page |
451 |
op_container_end_page |
467 |
_version_ |
1779318024968339456 |