The influence of ambient salinity on routine metabolism in the teleost Cyprinodon variegatus Lacepède |
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Authors: | F. G. Nordlie S. J. Walsh D. C. Haney T. F. Nordlie |
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Affiliation: | Department of Zoology, University of Florida, Gainesville, FL 32611, U.S.A. |
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Abstract: | Routine metabolism of the euryhaline cyprinodontid Cyprinodon variegatus Lacepede was measured at a series of ambient salinities ranging from fresh water through 100‰. Fish used had been sequentially acclimated to the test salinities (ambient temperature of 20±1° C and a 12: 12 L: D schedule). Routine metabolic rates were highest at ambient salinities from 15 to 50‰. Metabolism was somewhat lower at ambient salinities less than 15‰, and showed a sequential decline at ambient salinities greater than 50‰. It is suggested that routine metabolism is depressed at elevated salinities by reduced O, transfer, a consequence of maintenance of hydromineral balance in hypersaline waters. |
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Keywords: | routine metabolism salinity euryhaline Cyprinodon variegatus |
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