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

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dc.contributor.authorMiranda, Ten_AU
dc.contributor.authorSmith, JAen_AU
dc.contributor.authorSuthers, IMen_AU
dc.contributor.authorMazumder, Den_AU
dc.contributor.authorCruz, DOen_AU
dc.contributor.authorSchilling, HTen_AU
dc.contributor.authorSearle, Ken_AU
dc.contributor.authorVergés, Aen_AU
dc.date.accessioned2021-08-19T23:54:13Zen_AU
dc.date.available2021-08-19T23:54:13Zen_AU
dc.date.issued2019-06-30en_AU
dc.date.statistics2021-08-17en_AU
dc.description.abstractThe 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. © 2019 ICES/CIEMen_AU
dc.identifier.citationMiranda, T., Smith, J. A., Suthers, I. M., Mazumder, D., Cruz, D. O., Schilling, H. T., Searle, K., & Vergés, A. (2019). Convictfish on the move: variation in growth and trophic niche space along a latitudinal gradient. ICES Journal of Marine Science, 76(7), 2404-2412. doi:10.1093/icesjms/fsz098en_AU
dc.identifier.issn1054-3139en_AU
dc.identifier.issue7en_AU
dc.identifier.journaltitleICES Journal of Marine Scienceen_AU
dc.identifier.pagination2404-2412en_AU
dc.identifier.urihttps://doi.org/10.1093/icesjms/fsz098en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/11399en_AU
dc.identifier.volume76en_AU
dc.language.isoenen_AU
dc.publisherOxford Academicen_AU
dc.subjectFisheriesen_AU
dc.subjectClimatic changeen_AU
dc.subjectWateren_AU
dc.subjectAustraliaen_AU
dc.subjectFishesen_AU
dc.subjectTemperate zonesen_AU
dc.subjectNutritionen_AU
dc.subjectGrowthen_AU
dc.titleConvictfish on the move: variation in growth and trophic niche space along a latitudinal gradienten_AU
dc.typeJournal Articleen_AU
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