The final thermal preferendum of fishes: Shuttling behavior and acclimation overshoot |
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Authors: | William W. Reynolds |
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Affiliation: | (1) Biology Department, Pennsylvania State University, 18708 Wilkes-Barre, PA, U.S.A. |
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Abstract: | The concept of final preferendum is reexamined in light of data concerning acclimation in a cyclic thermal regime. Because of Shuttling behavior to temperatures above and below the mean preferendum, and because of faster acclimation upward than downward , which result in acclimation to a temperature exceeding the mean of the cycle, a fish may finally gravitate to a preferendum which does not equal acclimation temperature. It is suggested that a distinction be made between the crossover-point preferendum, where preference and acclimation are equal, and the ultimate preferendum to which a fish will ultimately gravitate. |
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Keywords: | Final preferendum temperature preference fish behavioral thermoregulation preferred temperature thermal preferendum acclimation |
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