28 028 mass g g 059 066 066 day 0 002 002 002 mass

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Unformatted text preview: 9 0.28 0.28 0.28 Mass (g) (g) 0.59 + 0.66 + 0.66 + Day 0 0.02 0.02 0.02 Mass (g) 0.89 + 0.98 + 0.96 + Day 9 0.03 0.03 0.03 Significant P<0.05 P<0.001 P=0.012 P=0.002 P=0.08 Conclusions Conclusions High temperature actually increases High temperature actually increases development rate of embryos However, high temperatures reduce mass However, high temperatures reduce mass and and SVL at birth Effects of high temperatures remain for up Effects of high temperatures remain for up to to 9 days after birth This size effect is probably sufficient to This size effect is probably sufficient to affect affect offspring fitness (survival) Overall conclusions Overall conclusions Pregant females actively regulate at Pregant females actively regulate at a lower lower Tb because of negative effects of high temperature on offspring fitness high temperature on offspring fitness How How might this evolve? Quantitative trait: Tb when pregnant Fitness Fitness differential (S): females with Tb = 32 3 2 OC Temperature regulation Poikilotherms don regulate internal Poikilotherms – don’t regulate internal temperature; temperature; temperature varies with environment Ectotherms Ectotherms – rely on external sources of energy to regulate body temperature Endotherms – rely on internally derived re metabolic metabolic heat energy • homeotherms: birds and mammals birds and mammals (maintain (maintain relatively constant body temperature, as opposed to certain fish and insects that onl...
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This document was uploaded on 03/29/2014 for the course ECOLOGY 3450 at Weber.

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