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    Testing isosource : stable isotope analysis of a tropical fishery with diverse organic matter sources

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    IND43795387.pdf (601.1Kb)
    Date
    2006-02
    Author
    Benstead, Jonathan P.  Concept link
    March, James G.  Concept link
    Fry, Brian  Concept link
    Ewel, Katherine C.  Concept link
    Pringle, Catherine M.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/4672
    As published
    https://doi.org/10.1890/05-0721
    DOI
    10.1890/05-0721
    Keyword
     Carbon; Food webs; IsoSource; Mangrove; Micronesia; Mixing models; Seagrasses; Stable isotope analysis; Sulfur 
    Abstract
    We sampled consumers and organic matter sources (mangrove litter, freshwater swamp-forest litter, seagrasses, seagrass epiphytes, and marine particulate organic matter [MPOM]) from four estuaries on Kosrae, Federated States of Micronesia for stable isotope (δ13C and δ34S) analysis. Unique mixing solutions cannot be calculated in a dual-isotope, five-endmember scenario, so we tested IsoSource, a recently developed statistical procedure that calculates ranges in source contributions (i.e., minimum and maximum possible). Relatively high minimum contributions indicate significant sources, while low maxima indicate otherwise. Litter from the two forest types was isotopically distinguishable but had low average minimum contributions (0–8% for mangrove litter and 0% for swamp-forest litter among estuaries). Minimum contribution of MPOM was also low, averaging 0–13% among estuaries. Instead, local marine sources dominated contributions to consumers. Minimum contributions of seagrasses averaged 8–47% among estuaries (range 0–88% among species). Minimum contributions of seagrass epiphytes averaged 5–27% among estuaries (range 0–69% among species). IsoSource enabled inclusion of five organic matter sources in our dual-isotope analysis, ranking trophic importance as follows: seagrasses > seagrass epiphytes > MPOM > mangrove forest > freshwater swamp-forest. IsoSource is thus a useful step toward understanding which of multiple organic matter sources support food webs; more detailed work is necessary to identify unique solutions.
    Description
    Author Posting. © Ecological Society of America, 2006. This article is posted here by permission of Ecological Society of America for personal use, not for redistribution. The definitive version was published in Ecology 87 (2006): 326–333, doi:10.1890/05-0721.
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    • Ecosystems Center
    Suggested Citation
    Ecology 87 (2006): 326–333
     

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