lecture 3 2009

lecture 3 2009 - Thermoregulation (regulation of body heat)...

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Thermoregulation (regulation of body heat) Song bird in winter pic White-crowned sparrow
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How is body heat regulated? 1) dissipation when body is hot 2) conserving, collecting and/or generating heat when body is cold Two types of wildlife from a thermoregulation perspective: 1) Homeotherms (endotherms): Internal heat is created through metabolism 2) Poikilotherms (ectotherms): Rely on external heat to maintain body temperature
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Endothermic fish?
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Homeotherms How do we do it? Chemical - metabolic breakdown of proteins, fats, carbs from food to produce energy in the form of heat Physical - insulation, dissipation, shivering, panting, sweating, hibernating/torpor Behavioral - micro-habitat use (shading, heliothermy, shelter), communal roosting Sea lions
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Heliothermy (heat gain from solar radiation)
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Region of homeothermy (range over which an animal can maintain its body temp) Lower lethal temperature (LLT) Upper lethal temperature (ULT) Resting metabolic rate Ambient temperature
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lecture 3 2009 - Thermoregulation (regulation of body heat)...

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