SREL Reprint #1203




Influences of Acclimation Temperature and Developmental Stage on Behavior Responses of Lake Chubsuckers to Temperature Gradients

Mary T. Negus, John M. Aho, and Charles S. Anderson



Behavioral responses of lake chubsucker Erimyson suceita, a dominant species in South Carolina river-swamp systems, to temperature gradients were examined to test for changes in response to temperature gradients during early growth.  In horizontal gradients, laboratory-reared fish acclimated to 15, 20, and 25C rarely selected a precise acute temperature preferendum, but rather they tolerated a range of temperatures.  Individuals often remained in a given location until conditions became extreme.  However, acute temperature preferends increased with acclimation temperature and with growth of mesolarvae, metalarvae, and juveniles.  Final preferendum estimates were 28.2, 28.4, and 34.0C respectively.  Their limited mobility and slow response to temperature changes leaves these early life stages particularly vulnerable to fluctuations in thermal effluence.


SREL Reprint #1203

Negus, M.T., J.M. Aho, and C.S. Anderson. 1987. Influence of acclimation temperature and developmental stage on behavioral responses of lake chubsuckers to temperature gradients. American Fisheries Society Symposium 2:157-163.

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