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Lecture 10-Physio - PhysicalEcology oftheOrganism...

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Physical Ecology of the Organism The physical environment can affect abundance and distribution of species Organisms adapt to their environment
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Physical Limitations to Life Temperature Heat Cold Water Gas exchange Light Body size
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Physical Limitations to Life Metabolism Energy acquisition Energy use Nutrient acquisition Waste elimination
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Temperature Enzymes work best in a narrow temperature range Freezing destroys cells Heating de-natures proteins
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Temperature Temperature affects water balance Water balance affects temperature Light levels affect temperature Temperature affects metabolism
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Temperature Organisms regulate their body temperatures Several different strategies are used
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Temperature Cold-blooded/warm-blooded: animals are cool/warm to the touch Poikilotherm/homeotherm: body temperature varies/stays constant
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Temperature Endotherms: generate heat internally via metabolism Ectotherms: require an external heat source
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Poikilothermic Endotherms
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Endotherm
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Endotherm (brood patch)
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Endotherm
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Ectotherms
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Ectotherms
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Functional endotherm
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sealevel.jpl.nasa.gov/.../ features/200509-3.html
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Functional endotherm
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