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  • Seagrass and epiphytic algae support nutrition of a fisheries species, Sillago schomburgkii, in adjacent intertidal habitats

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    Author(s)
    Connolly, RM
    Hindell, JS
    Gorman, D
    Griffith University Author(s)
    Connolly, Rod M.
    Year published
    2005
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    Abstract
    The importance of organic matter produced in seagrass meadows (seagrass and epiphytic algae) to the nutrition of a valuable fisheries species (yellowfin whiting Sillago schomburgkii Peters) occurring over unvegetated mudflats was measured using the isotopic composition (d13C, d15N) of fish, their polychaete prey, and available autotrophic sources at several locations in southern Australia during 2 periods (summer, winter). Values for d13C and d15N for autotrophs and fishes varied little between seasons. Sources could be separated into 3 groups based on d13C: seagrass and epiphytes (mean d13C = -10.5马 benthic microalgae and ...
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    The importance of organic matter produced in seagrass meadows (seagrass and epiphytic algae) to the nutrition of a valuable fisheries species (yellowfin whiting Sillago schomburgkii Peters) occurring over unvegetated mudflats was measured using the isotopic composition (d13C, d15N) of fish, their polychaete prey, and available autotrophic sources at several locations in southern Australia during 2 periods (summer, winter). Values for d13C and d15N for autotrophs and fishes varied little between seasons. Sources could be separated into 3 groups based on d13C: seagrass and epiphytes (mean d13C = -10.5马 benthic microalgae and macroalgae (-19.5马 and saltmarsh and mangroves (-26.5驮 Values of d15N for the sources were 2 to 5鮠Values of d13C for fish (-13.3驠corresponded with those of their polychaete prey (-12.5驠and ultimately with those of seagrass and epiphytes. Values of d15N were 5 to 6頭ore enriched than sources. Modelling of feasible source mixtures showed that seagrass and epiphytes were the most important contributors to the nutrition of fish, but their relative importance varied between seasons. The median contribution by other sources was <10%. Spatial analyses showed that saltmarsh plants contributed significantly to the variability in S. schomburgkii nutrition among locations, while macroalgae contributed in summer. The similarity in d13C values of polychaetes and S. schomburgkii is consistent with source material from a subtidal habitat being incorporated into food webs supporting a fisheries species in adjacent intertidal habitats via a largely sedentary intermediary.
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    Journal Title
    Marine Ecology Progress Series
    Volume
    286
    DOI
    https://doi.org/10.3354/meps286069
    Copyright Statement
    © 2005 Inter Research. The attached file is reproduced here in accordance with the copyright policy of the publisher. Please refer to the journal's website for access to the definitive, published version.
    Subject
    Oceanography
    Ecology
    Zoology
    Publication URI
    http://hdl.handle.net/10072/4395
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    • Journal articles

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