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    Movements of Diadromous Fish in Large Unregulated Tropical Rivers Inferred from Geochemical Tracers

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    Movements of Diadromous Fish in Large Unregulated Tropical Rivers Inferred from Geochemical Tracers (2.018Mb)

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    34
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    Author
    Walther, BD; Dempster, T; Letnic, M; McCulloch, MT
    Date
    2011-04-06
    Source Title
    PLOS ONE
    Publisher
    PUBLIC LIBRARY SCIENCE
    University of Melbourne Author/s
    Dempster, Tim
    Affiliation
    Zoology
    Metadata
    Show full item record
    Document Type
    Journal Article
    Citations
    Walther, B. D., Dempster, T., Letnic, M. & McCulloch, M. T. (2011). Movements of Diadromous Fish in Large Unregulated Tropical Rivers Inferred from Geochemical Tracers. PLOS ONE, 6 (4), https://doi.org/10.1371/journal.pone.0018351.
    Access Status
    Open Access
    URI
    http://hdl.handle.net/11343/28991
    DOI
    10.1371/journal.pone.0018351
    Open Access at PMC
    http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3071836
    Description

    C1 - Journal Articles Refereed

    Abstract
    Patterns of migration and habitat use in diadromous fishes can be highly variable among individuals. Most investigations into diadromous movement patterns have been restricted to populations in regulated rivers, and little information exists for those in unregulated catchments. We quantified movements of migratory barramundi Lates calcarifer (Bloch) in two large unregulated rivers in northern Australia using both elemental (Sr/Ba) and isotope ((87)Sr/(86)Sr) ratios in aragonitic ear stones, or otoliths. Chemical life history profiles indicated significant individual variation in habitat use, particularly among chemically distinct freshwater habitats within a catchment. A global zoning algorithm was used to quantify distinct changes in chemical signatures across profiles. This algorithm identified between 2 and 6 distinct chemical habitats in individual profiles, indicating variable movement among habitats. Profiles of (87)Sr/(86)Sr ratios were notably distinct among individuals, with highly radiogenic values recorded in some otoliths. This variation suggested that fish made full use of habitats across the entire catchment basin. Our results show that unrestricted movement among freshwater habitats is an important component of diadromous life histories for populations in unregulated systems.
    Keywords
    Freshwater Ecology; Fresh; Ground and Surface Water Flora; Fauna and Biodiversity

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