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Lecture 5 and 6 extra notes

Lecture 5 and 6 extra notes - Ectothermic cooling...

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Ectothermic cooling: Vaporization: Getting wet in a river, lake or sea. Convection: Climbing to lower ground from trees, into valleys, burrows , etc. Entering a cold water or air current. Building a nest that allows natural or generated air/water flow for cooling. Conduction: Lie on cold ground. Staying wet in a river, lake or sea. Covering in cool mud. Radiation: Find shade. Enter a burrow shaped for radiating heat (Black box effect). Expand folds of skin. Expose wing surfaces. Ectothermic heating (or minimising heat loss) Convection: Climb to higher ground up trees, ridges, rocks. Entering a warm water/air current. Building an insulated nest or burrow. Conduction: Lie on hot rock. Radiation: Lie in sun.
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Fold skin to reduce exposure. Conceal wing surfaces. To cope with low temperatures, some fish have developed the ability to remain functional even when the water temperature is below freezing; some use natural antifreeze or antifreeze proteins to resist ice crystal formation in their tissues. Amphibians and reptiles cope with heat loss by evaporative cooling and behavioral adaptations Endotherms To regulate body temperature, an organism may need to prevent heat gains in arid environments. Evaporation of water, either across respiratory surfaces or across the skin in those animals possessing sweat glands, helps in cooling body temperature to within the organism's tolerance range. Animals with a body covered by fur have limited ability to
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