G tunas and white sharks countercurrent heat exchange

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Unformatted text preview: found in endothermic endothermic fish, e.g., tunas and white sharks) Countercurrent Heat Exchange Countercurrent Heat Exchange Vascular Vascular arrangements reduce the amount of heat loss to the the aquatic environment Sociable Weaver < 10mm (0.4”) /yr Water Balance Water Balance Water content of most organisms 50-90% Survival requires maintenance requires maintenance Water Conservation Water Conservation • water proofing to reduce evaporation • concentrated urine or feces urine or feces • behavioral adaptions Case Study – Kangaroo Rats (Dipodomys) Metabolic water can also be important Metabolic water can also be important C6H12O6 + CO2 CO2 + H2O Result - Urine 17x more concentrated than blood • food high in carbohydrates • stored in burrows in burrows Nocturnal behavior largely due to water conservation not avoidance of high avoidance of high temperatures Reproduction correlates with rainfall Temperature regulation in endothermic Tem insects Bumblebees Bumblebees use metabolic heat to warm their flight muscles Large moths maintain fairly constant metabolic rate and Large moths maintain fairly constant metabolic rate and regulate regulate temperature via conductive and convective cooling / heating Physiological Physiological Ecology Summary Ecology of individuals Ecology of individuals Adaptive Ad...
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