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    Distribution and diel vertical movements of mesopelagic scattering layers in the Red Sea

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    Article-Marine_Bio-Distributi-2012.pdf
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    Type
    Article
    Authors
    Klevjer, Thor Aleksander
    Torres, Daniel J.
    Kaartvedt, Stein cc
    KAUST Department
    Biological and Environmental Sciences and Engineering (BESE) Division
    Marine Science Program
    Red Sea Research Center (RSRC)
    Date
    2012-06-13
    Online Publication Date
    2012-06-13
    Print Publication Date
    2012-08
    Permanent link to this record
    http://hdl.handle.net/10754/325463
    
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    Abstract
    The mesopelagic zone of the Red Sea represents an extreme environment due to low food concentrations, high temperatures and low oxygen waters. Nevertheless, a 38 kHz echosounder identified at least four distinct scattering layers during the daytime, of which the 2 deepest layers resided entirely within the mesopelagic zone. Two of the acoustic layers were found above a mesopelagic oxygen minimum zone (OMZ), one layer overlapped with the OMZ, and one layer was found below the OMZ. Almost all organisms in the deep layers migrated to the near-surface waters during the night. Backscatter from a 300 kHz lowered Acoustic Doppler Current Profiler indicated a layer of zooplankton within the OMZ. They carried out DVM, yet a portion remained at mesopelagic depths during the night. Our acoustic measurements showed that the bulk of the acoustic backscatter was restricted to waters shallower than 800 m, suggesting that most of the biomass in the Red Sea resides above this depth. 2012 The Author(s).
    Citation
    Klevjer TA, Torres DJ, Kaartvedt S (2012) Distribution and diel vertical movements of mesopelagic scattering layers in the Red Sea. Marine Biology 159: 1833-1841. doi:10.1007/s00227-012-1973-y.
    Publisher
    Springer Nature
    Journal
    Marine Biology
    DOI
    10.1007/s00227-012-1973-y
    PubMed ID
    24391275
    PubMed Central ID
    PMC3873044
    ae974a485f413a2113503eed53cd6c53
    10.1007/s00227-012-1973-y
    Scopus Count
    Collections
    Articles; Biological and Environmental Sciences and Engineering (BESE) Division; Red Sea Research Center (RSRC); Marine Science Program

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