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organismal phys

2 Pages

Course Code
Biology 2601A/B
Brent Sinclair

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Sept 2011 Poikilotherm An animal in which the body temperature is determined by equilibrium with the thermal conditions in the environment Are ectotherms passive victims of their thermal environments No they can regulate their temperature or modify their environment An example is shading by plants Animals can cool down in the shade Another example is evapotranspiration Roots draw water up through the plant 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 Evapotranspiration occurs in the Chihuahuan desert 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 Modification of the environment An example is termites that build a mud tunnel with water on rocks to avoid getting too hot while crossing the rock Collective thermoregulation For honey bees the air temperature is very hot during the day and very cool at night but their body temperatures dont fluctuate much because they bring water into their hives to keep cool Moths exhibit thoracic homeothermy because they physiologically thermoregulate during flight When insects are in flight they have very high metabolic rates and high heat production that is localized in the flight muscles in the thorax Regardless of the air temperature
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