The metabolism and swimming performance of sheepshead minnows (Cyprinodon variegatus) following thermal acclimation or acute thermal exposure.

Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology
Amanda Reynolds KirbyEdward M Mager

Abstract

Ectothermic animals are especially susceptible to temperature change, considering that their metabolism and core temperature are linked to the environmental temperature. As global water temperatures continue to increase, so does the need to understand the capacity of organisms to tolerate change. Sheepshead minnows (Cyprinodon variegatus) are the most eurythermic fish species known to date and can tolerate a wide range of environmental temperatures from - 1.9 to 43.0 °C. But little is known about the physiological adjustments that occur when these fish are subjected to acute thermal challenges and long-term thermal acclimation. Minnows were acclimated to 10, 21, or 32 °C for 4 weeks or acutely exposed to 10 and 32 °C and then assessed for swimming performance [maximum sustained swimming velocity (Ucrit), optimum swimming velocity (Uopt)] and metabolic endpoints (extrapolated standard and maximum metabolic rate [SMR, MMR), absolute aerobic scope (AS), and cost of transport (COT)]. Our findings show that the duration of thermal exposure (acute vs. acclimation) did not influence swimming performance. Rather, swimming performance was influenced by the exposure temperature. Swimming performance was statistically similar in fish expo...Continue Reading

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Citations

Nov 26, 2020·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·Olivia ThibaultLene H Petersen
May 26, 2021·Comparative Biochemistry and Physiology. Part B, Biochemistry & Molecular Biology·Cristiéle da Silva RibeiroRenata Guimarães Moreira

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