Macroecology of fish community biomass – size structure: Effects of invasive species and river regulation

R. Keller Kopf, Paul Humphries, Nick R. Bond, Neil C. Sims, Robyn J. Watts, Ross M. Thompson, Sally Hladyz, John D. Koehn, Alison J. King, Nicole McCasker, Simon McDonald

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    Abstract

    The biomass of organisms of different sizes is increasingly being used to explore macroscale variation in food-web and community structure. Here we examine how invasive species and river flow regulation affect native fish biomass and fish community log10 biomass – body mass scaling relationships in Australia’s largest river system, the Murray–Darling. The log10 biomass – body mass scaling exponent (scaling B) of invasive fishes (95% CI: −0.14 to −0.18) was less negative than for native fishes (95% CI: −0.20 to −0.25), meaning that invasive species attained a higher biomass in larger size-classes compared to native species. Flow alteration and invasive common carp (Cyprinus carpio) biomass were correlated with severe reductions in native fish biomass ranging from −47% to −68% (95% CI). Our study provides novel evidence suggesting that invasive and native communities have different biomass – body mass scaling patterns, which likely depend on differences in their trophic ecology and body size distributions. Our results suggest that restoration efforts using environmental flows and common carp control has potential to boost native fish biomass to more than double the current level.

    Original languageEnglish
    Pages (from-to)109-122
    Number of pages14
    JournalCanadian Journal of Fisheries and Aquatic Sciences
    Volume76
    Issue number1
    DOIs
    Publication statusPublished - 1 Jan 2019

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    Kopf, R. K., Humphries, P., Bond, N. R., Sims, N. C., Watts, R. J., Thompson, R. M., Hladyz, S., Koehn, J. D., King, A. J., McCasker, N., & McDonald, S. (2019). Macroecology of fish community biomass – size structure: Effects of invasive species and river regulation. Canadian Journal of Fisheries and Aquatic Sciences, 76(1), 109-122. https://doi.org/10.1139/cjfas-2017-0544