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dc.contributor.authorDuane, Daniel
dc.contributor.authorGodø, Olav Rune
dc.contributor.authorMakris, Nicholas C.
dc.date.accessioned2022-01-19T15:07:45Z
dc.date.available2022-01-19T15:07:45Z
dc.date.created2021-12-03T10:13:47Z
dc.date.issued2021
dc.identifier.citationRemote Sensing. 2021, 13 (22), .en_US
dc.identifier.issn2072-4292
dc.identifier.urihttps://hdl.handle.net/11250/2838341
dc.description.abstractNorwegian spring-spawning herring are a critical economic resource for multiple nations in the North Atlantic and a keystone species of the Nordic Seas ecosystem. Given the wide areas that the herring occupy, it is difficult to accurately measure the population size and spatial distribution. Ocean Acoustic Waveguide Remote Sensing (OAWRS) was used to instantaneously measure the areal population density of Norwegian herring over more than one thousand square kilometers in spawning grounds near Ålesund, Norway. In the vicinity of the Ålesund trench near peak spawning, significant attenuation in signal-to-noise ratio and mean sensing range was observed after nautical sunset that had not been observed in previous OAWRS surveys in the Nordic Seas or in other regions. We show that this range-dependent decay along a given propagation path was caused by attenuation through dense herring shoals forming at sunset and persisting through the evening for transmissions near the swimbladder resonance peak. OAWRS transmissions are corrected for attenuation in a manner consistent with waveguide scattering theory and simultaneous downward directed local line-transect measurements in the region in order to produce instantaneous wide-area population density maps. Corresponding measured reductions in the median sensing range over the azimuth before ambient noise limitation are shown to be theoretically predictable from waveguide scattering theory and observed population densities. Spatial-temporal inhomogeneities in wide-area herring distributions seen synoptically in OAWRS imagery show that standard sparsely spaced line-transect surveys through this region during spawning can lead to large errors in the estimated population due to spatial and temporal undersampling.en_US
dc.language.isoengen_US
dc.titleQuantification of wide-area norwegian spring-spawning herring population density with ocean acoustic waveguide remote sensing (OAWRS)en_US
dc.typePeer revieweden_US
dc.typeJournal articleen_US
dc.description.versionpublishedVersionen_US
dc.source.pagenumber28en_US
dc.source.volume13en_US
dc.source.journalRemote Sensingen_US
dc.source.issue22en_US
dc.identifier.doi10.3390/rs13224546
dc.identifier.cristin1964033
cristin.ispublishedtrue
cristin.fulltextoriginal
cristin.qualitycode1


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