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. Attached Files Name Description MIMEType Size Downloads 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 1095-9289 Keyword(s) Science & Technology Life Sciences & Biomedicine Physical Sciences Fisheries Marine & Freshwater Biology Oceanography Acanthuridae Acanthurus triostegus climate change marine ecology range shifts tropicalization STABLE-ISOTOPE HERBIVOROUS FISHES BODY CONDITION NITROGEN FOOD CARBON LARVAL CONSUMPTION TEMPERATURE TRANSITION 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 Persistent URL http://hdl.handle.net/10536/DRO/DU:30142348 Document type: Journal Article Collection: Faculty of Science, Engineering and Built Environment Related Links Link Description Connect to published version Go to link with your DU access privileges     Unless expressly stated otherwise, the copyright for items in DRO is owned by the author, with all rights reserved. Versions Version Filter Type Mon, 21 Sep 2020, 11:22:07 EST Tue, 22 Sep 2020, 05:00:47 EST Tue, 22 Sep 2020, 06:04:06 EST Wed, 23 Sep 2020, 07:12:36 EST Wed, 23 Sep 2020, 07:21:32 EST Wed, 23 Sep 2020, 07:40:13 EST Filtered Full Citation counts:   Cited 3 times in TR Web of Science Cited 3 times in Scopus Search Google Scholar Access Statistics: 45 Abstract Views, 2 File Downloads  -  Detailed Statistics Created: Mon, 21 Sep 2020, 11:22:07 EST

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