Heat transfer in fish: are short excursions between habitats a thermoregulatory behaviour to exploit resources in an unfavourable thermal environment?

摘要: ABSTRACT Temperature is the primary environmental factor affecting physiological processes in ectotherms. Heat-transfer models describe how fish9s internal temperature responds to a fluctuating thermal environment. Specifically, rate coefficient ( k ), defined as instantaneous of change body relation difference between ambient and temperature, summarizes combined effects direct conduction through mass, passive convection (intracellular intercellular fluids) forced convective heat transfer (cardiovascular system). The -coefficient widely used fish ecology understand changes water temperature. main objective this study was estimate brook charr equipped with temperature-sensitive transmitters controlled laboratory experiments. Fish were first transferred from acclimation tanks (10°C) at 14, 19 or 23°C (warming experiments) then returned (10°C; cooling experiments), thus producing six step We non-linear mixed -coefficient. Model comparisons indicated that model incorporating function absolute (d T : 4, 9 13°C) best described change. By simulating heterogeneous environment, we provide theoretical predictions maximum excursion duration feeding resting areas. Our simulations suggest short (i.e.