|SREL Reprint #1203|
Influences of Acclimation Temperature and Developmental
Stage on Behavior Responses of Lake Chubsuckers to Temperature Gradients
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
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 34.0°C
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.