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Plasticity In Standard And Maximum Aerobic Metabolic Rates In Two Populations Of An Estuarine Dependent Teleost, Spotted Seatrout (Cynoscion Nebulosus)
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2019
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Source: Biology 2019, 8(2), 46
[PDF-1.70 MB]
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Journal Title:Biology
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Description:We studied the effects of metabolic cold adaptation (MCA) in two populations of a eurythermal species, spotted seatrout (Cynoscion nebulosus) along the U.S. East Coast. Fish were captured from their natural environment and acclimated at control temperatures 15 °C or 20 °C. Their oxygen consumption rates, a proxy for metabolic rates, were measured using intermittent flow respirometry during acute temperature decrease or increase (2.5 °C per hour). Mass-specific standard metabolic rates (SMR) were higher in fish from the northern population across an ecologically relevant temperature gradient (5 °C to 30 °C). SMR were up to 37% higher in the northern population at 25 °C and maximum metabolic rates (MMR) were up to 20% higher at 20 °C. We found evidence of active metabolic compensation in the southern population from 5 °C to 15 °C (Q10 < 2), but not in the northern population. Taken together, our results indicate differences in metabolic plasticity between the northern and southern populations of spotted seatrout and provide a mechanistic basis for predicting population-specific responses to climate change.
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Source:Biology 2019, 8(2), 46
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DOI:
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Sea Grant Document Number:VSGCP-R-19-015
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Rights Information:CC BY
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