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    Beyond the average: Diverse individual migration patterns in a population of mesopelagic jellyfish

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    Type
    Article
    Authors
    Kaartvedt, Stein cc
    Titelman, Josefin
    Røstad, Anders cc
    Klevjer, Thor Aleksander
    KAUST Department
    Biological and Environmental Sciences and Engineering (BESE) Division
    Marine Science Program
    Red Sea Research Center (RSRC)
    Date
    2011-10-22
    Online Publication Date
    2011-10-22
    Print Publication Date
    2011-11
    Permanent link to this record
    http://hdl.handle.net/10754/555798
    
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    Abstract
    We examined the diel behavior among the jellyfish Periphylla periphylla in Lurefjorden, Norway in a sampling campaign and by a > 3-month continuous acoustic study. Jellyfish distribution and behavior were recorded by an upward-facing, bottom-mounted echo sounder at 280-m depth. The population was typically divided into four groups, each with different behavior. Individuals of behavioral Mode 1 undertook synchronous diel vertical migrations (DVM) within the upper 100 m. Individuals of behavioral Mode 2, stayed at ~ 160-200-m depth during the day, and also exhibited synchronized DVM, ascending at dusk and descending at dawn. The smaller individuals of behavioral Mode 3 swam continuously up and down throughout both day and night, yet occurred below Mode 2 individuals in daytime (~ 200 m-bottom), while their vertical range encompassed the entire water column during night. Mode 4 behavior was displayed by large jellyfish located between ~ 130 m and the bottom. These animals shifted between remaining motionless and relocating in rapid steps during both day and night. These four main behavioral patterns persisted throughout the registration period, although the synchronously migrating Mode 2 behavior became weaker in spring. This acoustic study has unveiled more diverse migration behaviors than previously derived from net sampling and remote-operated vehicles methods and emphasizes the importance of studying individuals. DVM is complex because individuals in a plankton population may simultaneously engage in a range of various contrasting behaviors.
    Citation
    Beyond the average: Diverse individual migration patterns in a population of mesopelagic jellyfish 2011, 56 (6):2189 Limnology and Oceanography
    Publisher
    Wiley
    Journal
    Limnology and Oceanography
    DOI
    10.4319/lo.2011.56.6.2189
    Additional Links
    http://doi.wiley.com/10.4319/lo.2011.56.6.2189
    ae974a485f413a2113503eed53cd6c53
    10.4319/lo.2011.56.6.2189
    Scopus Count
    Collections
    Articles; Biological and Environmental Science and Engineering (BESE) Division; Red Sea Research Center (RSRC); Marine Science Program

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