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Unformatted text preview: Physiological Ecology 2 4 June 1 Physiological Ecology Physiological Ecology – study of how organisms are able to survive and function in their environment Tolerance – capacity of an organism to survive or reproduce when subjected to a stressful environmental factor Temperature Fitness Sp. A Sp. B Sp. C Tolerance Curves Physiological Ecology 2 4 June 2 How do organisms react to environmental variation in temperature How do organisms react to environmental variation in temperature ? Thermal regulators – (homeotherms) maintain a constant body temperature Thermal conformers – (poikilotherms) body temperature varies with environmental temperature. Endotherms – produce their own body heat (shivering, oxidizing brown fat) Ectotherms – obtain their body heat from the environment What are the costs and benefits of thermal regulation? What are the costs and benefits of thermal regulation? Examples: most invertebrates, fish, amphibians, reptiles Examples: birds and mammals Metabolic Rate – amount of energy used per time unit C 6 H 12 O 6 + 6O 2 6CO...
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- Spring '08
- metabolic rate, Warm-blooded, Physiological Ecology, Intertidal Limpets