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dc.contributor.authorHozumi, Aya
dc.contributor.authorKaartvedt, Stein
dc.contributor.authorRøstad, Anders
dc.contributor.authorBerumen, Michael L.
dc.contributor.authorCochran, Jesse E.M.
dc.contributor.authorJones, Burton
dc.date.accessioned2018-04-16T11:27:41Z
dc.date.available2018-04-16T11:27:41Z
dc.date.issued2018-03-28
dc.identifier.citationHozumi A, Kaartvedt S, Røstad A, Berumen ML, Cochran JEM, et al. (2018) Acoustic backscatter at a Red Sea whale shark aggregation site. Regional Studies in Marine Science 20: 23–33. Available: http://dx.doi.org/10.1016/j.rsma.2018.03.008.
dc.identifier.issn2352-4855
dc.identifier.doi10.1016/j.rsma.2018.03.008
dc.identifier.urihttp://hdl.handle.net/10754/627490
dc.description.abstractAn aggregation of sexually immature whale sharks occurs at a coastal submerged reef near the Saudi Arabian Red Sea coast each spring. We tested the hypothesis that these megaplanktivores become attracted to a prey biomass peak coinciding with their aggregation. Acoustic backscatter of the water column at 120 kHz and 333 kHz –a proxy for potential prey biomass –was continuously measured spanning the period prior to, during, and subsequent to the seasonal whale shark aggregations. No peak in acoustic backscatter was observed at the time of the aggregation. However, we observed a decrease in acoustic backscatter in the last days of deployment, which coincided the trailing end of whale shark season. Organisms forming the main scattering layer performed inverse diel vertical migration, with backscatter peaking at mid-depths during the day and in the deeper half of the water column at night. Target strength analyses suggested the backscatter was likely composed of fish larvae. Subsurface foraging behavior of the whale sharks within this aggregation has not been described, yet this study does not support the hypothesis that seasonal peaks in local whale shark abundance correspond to similar peaks in prey availability.
dc.description.sponsorshipWe thank the RV Thuwal captain and crew, Francis Mallon, Lloyd Smith, Ioannis Georgakakis, Brian Hession, Ingrid Solberg, and Joseph DiBattista for field and logistical support. The KAUST Coastal and Marine Resources Core Lab (CMRCL) and Dreams Divers (Jeddah, Saudi Arabia) facilitated many additional aspects of fieldwork. We thank Riata Amundsen for her substantial help in zooplankton identification, and Darren Coker for analysis help. This study was funded by King Abdullah University of Science and Technology (KAUST).
dc.publisherElsevier BV
dc.relation.urlhttp://www.sciencedirect.com/science/article/pii/S2352485516302407
dc.rightsNOTICE: this is the author’s version of a work that was accepted for publication in Regional Studies in Marine Science. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Regional Studies in Marine Science, [, , (2018-03-28)] DOI: 10.1016/j.rsma.2018.03.008 . © 2018. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subjectAcoustic backscatter
dc.subjectDiel vertical migration
dc.subjectRed sea
dc.subjectTarget strength
dc.subjectWhale shark aggregation
dc.titleAcoustic backscatter at a Red Sea whale shark aggregation site
dc.typeArticle
dc.contributor.departmentBiological and Environmental Sciences and Engineering (BESE) Division
dc.contributor.departmentRed Sea Research Center (RSRC)
dc.contributor.departmentMarine Science Program
dc.identifier.journalRegional Studies in Marine Science
dc.eprint.versionPost-print
dc.contributor.institutionDepartment of Biosciences, University of Oslo, N-0316 Oslo, Norway
kaust.personHozumi, Aya
kaust.personRøstad, Anders
kaust.personBerumen, Michael L.
kaust.personCochran, Jesse E.M.
kaust.personJones, Burton


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