부산대학교 도서관

Synopsis:We present a bioenergetics model for largemouth bass (Micropterus salmoides) which simulates growth as a function of body size, temperature, activity and consumption level. We apply the model to investigate seasonal changes in condition factor exhibited by bass in Par Pond, South Carolina, a reservoir receiving heated effluent. Previous authors have suggested that these changes occur due to bioenergetic constraints, primarily the effects of heated effluent on metabolic rate. Model simulations were used to evaluate the hypotheses that seasonal changes in condition factor were caused by the heated effluent, seasonally variable activity, seasonally variable consumption, or reproductive costs.Results indicate that temperature is not directly responsible for the seasonal changes in condition factor. Bass moderate the influence of the heated effluent via behavioral thermoregulation. Activity is not a major factor, and spawning weight-loss can account for only a small portion of the observed variation. However, the pattern of seasonal changes in body condition may be adequately explained by seasonal variations in consumption. The patterns of consumption rate and/or prey availability suggested by model simulations represent testable hypotheses.