Convictfish on the move: variation in growth and trophic niche space along a latitudinal gradient

Miranda, T., Smith, J. A., Suthers, I. M., Mazumder, D., Cruz, D. O., Schilling, H. T., Searle, K., Vergés, A. and Secor, D. 2019, Convictfish on the move: variation in growth and trophic niche space along a latitudinal gradient, ICES Journal of Marine Science, vol. 76, no. 7, pp. 2404-2412, doi: 10.1093/icesjms/fsz098.

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Title Convictfish on the move: variation in growth and trophic niche space along a latitudinal gradient
Author(s) Miranda, T.
Smith, J. A.
Suthers, I. M.
Mazumder, D.
Cruz, D. O.
Schilling, H. T.
Searle, K.
Vergés, A.
Secor, D.
Journal name ICES Journal of Marine Science
Volume number 76
Issue number 7
Start page 2404
End page 2412
Total pages 9
Publisher Oxford University Press
Place of publication Oxford, Eng.
Publication date 2019-12-01
ISSN 1054-3139
Keyword(s) Science & Technology
Life Sciences & Biomedicine
Physical Sciences
Marine & Freshwater Biology
Acanthurus triostegus
climate change
marine ecology
range shifts
Summary The range expansion of tropical fish into temperate waters is increasing markedly in response to climate change. Range-expanding fish encounter novel diets and environments, but we know little about how these conditions facilitate or hinder distribution shifts. Here, we quantified relative growth rate, morphometric condition and trophic niche of juvenile Acanthurus triostegus, a dominant range-expanding tropical surgeonfish, at four locations across 10° of latitude off eastern Australia. We related these metrics to differences in temperature and nutritional quality of dominant seaweeds and the epilithic algal matrix. Temperate food sources were richer in nitrogen than tropical diets. Stable isotope analysis (δ13 carbon and δ15 nitrogen) of fish muscle revealed a large trophic niche breadth at the highest latitude indicating a generalist foraging strategy, and more nitrogen-enriched isotopic signatures compared to tropical regions. Fish length was strongly correlated to δ13C in all regions, suggesting an ontogenetic shift in diet independent of latitude. Despite temperature differences of 4°C, fish growth and body condition were similar across tropical and temperate regions. These results suggest that more nutritious temperate diets may compensate for the effects of cooler water temperatures. Neither summer water temperatures nor dietary factors appear to limit the success of juvenile tropical vagrants as they continue to expand their range along eastern Australia.
Language eng
DOI 10.1093/icesjms/fsz098
Indigenous content off
Field of Research MD Multidisciplinary
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2019, International Council for the Exploration of the Sea
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Document type: Journal Article
Collection: Faculty of Science, Engineering and Built Environment
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