Biology 2601A/B Lecture : organismal phys
20 Feb 2012
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Poikilotherm: an animal in which the body temperature is determined by equilibrium with the thermal conditions in the environment. No, they can regulate their temperature or modify their environment. Because the evaporation of water requires energy, when water evaporates from a leaf, it withdraws large amounts of heat from the leaf and cools the plant down. Plants here are cooler than their environment due to evaporation. Behavioural thermoregulation: when the temperatures of actual lizards and model lizards were compared, it was found that the actual body temperatures were much lower than the model temperatures. They avoid high and low temperatures by shuffling between the sun and shade. They can modify their temperature by moving around. Some animals are able to regulate their temperature even without moving around by selecting their microhabitats. Animals that position themselves below snow have very stable temperatures, whereas animals that are above the snow have much cooler and fluctuating temperatures.
