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Lecture 11 Sakai - Lecture 11 Lecture Endothermy 11 October...

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Lecture 11 Lecture 11 Endothermy Endothermy 11 October 2010 11 October 2010
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Heat Balance energy in + energy generated = energy out + energy stored “Energy in” is dominant in ectotherms. “Energy generated” is dominant in endotherms. The sum total of heat exchange between an organism and its environment determines the body temperature of the organism.
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Heat Balance S = solar radiation R = thermal radiation to and from substrate L = latent heat of evaporation E = rate of evaporation G = conduction to and from the ground C = convectional exchange with the air M = metabolic heat production s = storage (or loss) of heat S + R + LE + G + C + M + s = 0 S + R + LE + G + C + M + s = 0
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Heat Balance S + R + LE + G + C + M + s = 0 S + R + LE + G + C + M + s = 0 (S + (S + R R i ) + M = (G + C + R ) + M = (G + C + R e + LE) + s + LE) + s heat in + heat generated = heat out + heat stored heat in + heat generated = heat out + heat stored Rearrange. Translate into plain language.
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Endothermic Homeothermy Thermoneutral Zone (TNZ)
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M = C (T b – T a ) Endothermic Homeothermy M = rate of metabolic heat production C = thermal conductance, a measure of how easily heat moves from animal to environment Within or below TNZ, (T b – T a ) > 0
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