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dc.contributor.authorMessmer, Vanessa
dc.contributor.authorPratchett, Morgan S.
dc.contributor.authorHoey, Andrew S.
dc.contributor.authorTobin, Andrew J.
dc.contributor.authorCoker, Darren James
dc.contributor.authorCooke, Steven J.
dc.contributor.authorClark, Timothy D.
dc.date.accessioned2017-01-29T13:51:36Z
dc.date.available2017-01-29T13:51:36Z
dc.date.issued2016-12-13
dc.identifier.citationMessmer V, Pratchett MS, Hoey AS, Tobin AJ, Coker DJ, et al. (2016) Global warming may disproportionately affect larger adults in a predatory coral reef fish. Global Change Biology. Available: http://dx.doi.org/10.1111/gcb.13552.
dc.identifier.issn1354-1013
dc.identifier.doi10.1111/gcb.13552
dc.identifier.urihttp://hdl.handle.net/10754/622755
dc.description.abstractGlobal warming is expected to reduce body sizes of ectothermic animals. Although the underlying mechanisms of size reductions remain poorly understood, effects appear stronger at latitudinal extremes (poles and tropics) and in aquatic rather than terrestrial systems. To shed light on this phenomenon, we examined the size dependence of critical thermal maxima (CTmax) and aerobic metabolism in a commercially important tropical reef fish, the leopard coral grouper (Plectropomus leopardus) following acclimation to current-day (28.5 °C) vs. projected end-of-century (33 °C) summer temperatures for the northern Great Barrier Reef (GBR). CTmax declined from 38.3 to 37.5 °C with increasing body mass in adult fish (0.45-2.82 kg), indicating that larger individuals are more thermally sensitive than smaller conspecifics. This may be explained by a restricted capacity for large fish to increase mass-specific maximum metabolic rate (MMR) at 33 °C compared with 28.5 °C. Indeed, temperature influenced the relationship between metabolism and body mass (0.02-2.38 kg), whereby the scaling exponent for MMR increased from 0.74 ± 0.02 at 28.5 °C to 0.79 ± 0.01 at 33 °C, and the corresponding exponents for standard metabolic rate (SMR) were 0.75 ± 0.04 and 0.80 ± 0.03. The increase in metabolic scaling exponents at higher temperatures suggests that energy budgets may be disproportionately impacted in larger fish and contribute to reduced maximum adult size. Such climate-induced reductions in body size would have important ramifications for fisheries productivity, but are also likely to have knock-on effects for trophodynamics and functioning of ecosystems.
dc.description.sponsorshipThis study was funded by grants from the Lizard Island Research Station, a facility of the Australian Museum (Isobel Bennett Marine Biology 2012 Postdoctoral Fellowship to VM; Peter Teakle Sustainable Research Fishing Grant 2012 to TDC, SJC, VM, AJT and MSP), FRDC-DCCEE funding to MSP and VM, and a Smart Futures Fellowship to MSP. We thank the Lizard Island Research Station for logistical support and Kimberly Gossard for assistance with the CTmax trials.
dc.publisherWiley
dc.relation.urlhttp://onlinelibrary.wiley.com/doi/10.1111/gcb.13552/full
dc.subjectClimate change
dc.subjectMetabolic rate
dc.subjectBody size
dc.subjectThermal tolerance
dc.subjectCritical thermal maximum
dc.subjectGreat Barrier Reef
dc.subjectPlectropomus Leopardus
dc.titleGlobal warming may disproportionately affect larger adults in a predatory coral reef fish
dc.typeArticle
dc.contributor.departmentBiological and Environmental Sciences and Engineering (BESE) Division
dc.contributor.departmentRed Sea Research Center (RSRC)
dc.identifier.journalGlobal Change Biology
dc.contributor.institutionAustralian Research Council Centre of Excellence for Coral Reef Studies; James Cook University; Townsville Queensland 4811 Australia
dc.contributor.institutionCentre for Sustainable Tropical Fisheries and Aquaculture; School of Earth and Environmental Sciences; James Cook University; Townsville Queensland 4811 Australia
dc.contributor.institutionFish Ecology and Conservation Physiology Laboratory; Department of Biology and Institute of Environmental Science; Carleton University; Ottawa Ontario K1S 5B6 Canada
dc.contributor.institutionAustralian Institute of Marine Science; Townsville Queensland 4810 Australia
dc.contributor.institutionUniversity of Tasmania, and CSIRO Agriculture and Food; Hobart Tasmania 7000 Australia
kaust.personCoker, Darren James
dc.date.published-online2016-12-13
dc.date.published-print2017-06


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