Lecture12PhysEco2 - successful Optimization Molecules...

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Biosphere Physiological Ecology: Acclimation
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1. physiological adjustments Mechanisms of Homeostasis 3. behavioral adjustments 2. morphological adjustments
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Activity space -- the particular combination of time and space where an organism is active in the environment Avoidance
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extreme desert environment > 55 deg C in summer, < 0 deg C in winter Desert Iguana preferred body temperature = 39-43 deg C must move between sun and shade daily and seasonally to maintain body temperature
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Desert Iguana
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Desert Iguana
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Cactus Wren
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multiple broods are reared per season Cactus Wren Nesting Behavior spring nests are built with entrances facing away from wind summer nests are built with entrance facing toward wind
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Cactus Wren Nesting Behavior
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Cactus Wren Nesting Behavior nests facing in the proper direction, based on season, are 82% successful nests in the wrong direction are 45%
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Unformatted text preview: successful Optimization Molecules responsible for biological function are extremely sensitive to changes in temperature, pH, and salt concentration At low temperatures, enzyme reaction kinetics are slow. At high temperatures, enzymes are destabilized Halophylic Bacteria Biological molecules with similar function can have different optimum conditions with small changes in structure Acclimation Acclimation optimum conditions are based on the environment that the organism experiences phenotypic plasticity-- range of environmentally induced variation in phenotype Acclimation Optimization tradeoff-- in order to get something, you have to give up something cost/benefit analysis-- costs and benefits often measured in energy terms. Costs and benefits may be different under different environmental conditions Acclimation...
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This note was uploaded on 07/13/2011 for the course PCB 4034C taught by Professor Osenberg during the Spring '11 term at University of Florida.

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Lecture12PhysEco2 - successful Optimization Molecules...

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