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dc.contributor.authorDunn, Muriel Barbara
dc.contributor.authorPedersen, Geir
dc.contributor.authorBasedow, Sünnje Linnéa
dc.contributor.authorDaase, Malin
dc.contributor.authorFalk-Petersen, Stig
dc.contributor.authorBachelot, Loic
dc.contributor.authorCamus, Lionel
dc.contributor.authorGeoffroy, Maxime
dc.date.accessioned2023-01-16T11:34:23Z
dc.date.available2023-01-16T11:34:23Z
dc.date.issued2022-11-10
dc.description.abstractThroughout 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.en_US
dc.identifier.citationDunn 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. 2022en_US
dc.identifier.cristinIDFRIDAID 2104127
dc.identifier.doi10.1139/cjfas-2022-0105
dc.identifier.issn0706-652X
dc.identifier.issn1205-7533
dc.identifier.urihttps://hdl.handle.net/10037/28252
dc.language.isoengen_US
dc.publisherCanadian Science Publishingen_US
dc.relation.journalCanadian Journal of Fisheries and Aquatic Sciences
dc.relation.projectIDNorges forskningsråd: 269188en_US
dc.relation.projectIDNorges forskningsråd: 287043en_US
dc.relation.projectIDNorges forskningsråd: 309512en_US
dc.rights.accessRightsopenAccessen_US
dc.rights.holderCopyright 2022 The Author(s)en_US
dc.rights.urihttps://creativecommons.org/licenses/by/4.0en_US
dc.rightsAttribution 4.0 International (CC BY 4.0)en_US
dc.titleInverse method applied to autonomous broadband hydroacoustic survey detects higher densities of zooplankton in near-surface aggregations than vessel-based net surveyen_US
dc.type.versionpublishedVersionen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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Attribution 4.0 International (CC BY 4.0)
Med mindre det står noe annet, er denne innførselens lisens beskrevet som Attribution 4.0 International (CC BY 4.0)