Elevated temperature causes metabolic trade-offs at the whol

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TitleElevated temperature causes metabolic trade-offs at the wholeorganism level in the Antarctic fish Trematomus bernacchiiAbstractAs a response to ocean warming, shifts in fish species distribution and changes in production have been reported that have been partly attributed to temperature effects on the physiology of animals. The Southern Ocean hosts some of the most rapidly warming regions on earth and Antarctic organisms are reported to be especially temperature sensitive. While cellular and molecular organismic levels appear, at least partially, to compensate for elevated temperatures, the consequences of acclimation to elevated temperature for the whole organism are often less clear. Growth and reproduction are the driving factors for population structure and abundance. The aim of this study was to assess the effect of long-term acclimation to elevated temperature on energy budget parameters in the high- Antarctic fish Trematomus bernacchii. Our results show a complete temperature compensation for routine metabolic costs after 9 weeks of acclimation to 4 deg C. However, an up to 84% reduction in mass growth was measured at 2 and 4 deg C compared with the control group at 0 deg C, which is best explained by reduced food assimilation rates at warmer temperatures. With regard to a predicted temperature increase of up to 1.4 deg C in the Ross Sea by 2200, such a significant reduction in growth is likely to affect population structures in nature, for example by delaying sexual maturity and reducing production, with severe impacts on Antarctic fish communities and ecosystems. Copyright 2015. Published by The Company of Biologists Ltd.AcknowledgementsThe authors would like to thank the staff of Antarctic New Zealand for all their support in Antarctica and New Zealand. Moreover, we thank Rob Robins for his help collecting the animals, Rennie Bishop, Alan Woods and Jan McKenzie for their technical assistance during experiments as well as Christiane Lorenzen and Holger Auel for assistance with CN and lipid analysis. Moreover, we thank the two anonymous reviewers for their constructive comments that helped to improve the manuscript. This research was supported by a New Zealand Antarctic Research Institute grant to M.D.L. (NZARI 2103-4). T.S. was supported by a PhD scholarship as well as a travel grant of the Helmholtz Graduate School for Polar and Marine Research (POLMAR) and by the PACES II programme.

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1st AuthorSandersfeld, T.AuthorSandersfeld, T.Davison, W.Lamare, M.Knust, R.Richter, C.Year2015JournalJournal of Experimental BiologyVolume218Number15Pages2373-2381DOI10.1242/jeb.122804URLhttps://www.scopus.com/inward/recor.....d2194b703c30a5467ef91c821KeywordsacclimatizationanimalAntarcticabasal metabolic ratebody sizebody weightclimate changeeatinggrowth, development and agingmetabolismPerciformesphysiologytemperature, AcclimatizationAnimalsAntarctic RegionsBasal MetabolismBody SizeBody WeightClimate ChangeEatingPerciformesTemperature, rank5Author KeywordsAntarcticaClimate changeEnergy budgetGrowthProductionTeleostThermal tolerance

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TypeArticleCitationSandersfeld, T., Davison, W., Lamare, M., Knust, R. and Richter, C. (2015) Elevated temperature causes metabolic trade-offs at the wholeorganism level in the {Antarctic} fish {Trematomus} bernacchii. Journal of Experimental Biology, 218(15): 2373-2381 doi:10.1242/jeb.122804 IdentifierSandersfeld2015Relevancerank5

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Lamare, M.