302 notes 4

302 notes 4 - Adaptations to Environments Goals Adaptations...

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Adaptations to Environments Goals • Adaptations allow organisms to face challenges presented by the physical environment • Be familiar w/ general principles • Be able to use specific properties of organisms to illustrate • Discuss the adaptations to specific extreme environmental challenges
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Gradients Non-living vs. living systems
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Organisms use energy to act against physical forces in the environment Organisms control the energy and material fluxes Dynamic steady state (DSS) out of equilibrium w/ their environment Specific adaptations to maintain the DSS
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Organisms control flux Flux = gradient X conductance X surface area Homeostasis: • maintain constant internal conditions in the face of a varying environment • operates through negative feedback
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Negative Feedback and Temperature Regulation Example: Temperature Regulation homeotherms (warm-blooded animals) - constant internal temperatures – homeotherms are endotherms poikilotherms (cold-blooded animals) - conform to external temperatures –some regulate internal temp with behavior ( ectotherms)
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This note was uploaded on 09/16/2008 for the course ECOL 302 taught by Professor Pavao during the Spring '08 term at Arizona.

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302 notes 4 - Adaptations to Environments Goals Adaptations...

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