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

Research output: Contribution to journalArticle

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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
Early online date25 Jun 2018
DOIs
Publication statusPublished - Jan 2019

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macroecology
size structure
invasive species
Fish
Biomass
Rivers
ecology
rivers
biomass
fish
river
Cyprinus carpio
body mass
regulation
effect
fish communities
flow regulation
Ecology
river flow
native species

Cite this

Kopf, R. Keller ; Humphries, Paul ; Bond, Nick R. ; Sims, Neil C. ; Watts, Robyn J. ; Thompson, Ross M. ; Hladyz, Sally ; Koehn, John D. ; King, Alison J. ; McCasker, Nicole ; McDonald, Simon. / Macroecology of fish community biomass – size structure : Effects of invasive species and river regulation. In: Canadian Journal of Fisheries and Aquatic Sciences. 2019 ; Vol. 76, No. 1. pp. 109-122.
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Macroecology of fish community biomass – size structure : Effects of invasive species and river regulation. / Kopf, R. Keller; Humphries, Paul; Bond, Nick R.; Sims, Neil C.; Watts, Robyn J.; Thompson, Ross M.; Hladyz, Sally; Koehn, John D.; King, Alison J.; McCasker, Nicole; McDonald, Simon.

In: Canadian Journal of Fisheries and Aquatic Sciences, Vol. 76, No. 1, 01.2019, p. 109-122.

Research output: Contribution to journalArticle

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AU - Thompson, Ross M.

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