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Plasticity in Standard and Maximum Aerobic Metabolic Rates in Two Populations of an Estuarine Dependent Teleost, Spotted Seatrout (Cynoscion nebulosus)

Virginia Institute of Marine Science, William & Mary, P.O. Box 1346, Gloucester Point, VA 23062, USA
Author to whom correspondence should be addressed.
Biology 2019, 8(2), 46;
Received: 9 April 2019 / Revised: 16 May 2019 / Accepted: 11 June 2019 / Published: 14 June 2019
(This article belongs to the Special Issue Fish Metabolic Physiology in Response to Stress)
PDF [1742 KB, uploaded 14 June 2019]


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. View Full-Text
Keywords: metabolic rates; aerobic scope; estuarine fish; plasticity metabolic rates; aerobic scope; estuarine fish; plasticity

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Song, J.; Brill, R.W.; McDowell, J.R. Plasticity in Standard and Maximum Aerobic Metabolic Rates in Two Populations of an Estuarine Dependent Teleost, Spotted Seatrout (Cynoscion nebulosus). Biology 2019, 8, 46.

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