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![Page 1: Physiological Ecology Homeostasis: maintenance of a relatively stable internal state under a much wider range of external environmental conditions. Temperature.](https://reader036.fdocuments.net/reader036/viewer/2022062423/56649f475503460f94c692fe/html5/thumbnails/1.jpg)
Physiological EcologyHomeostasis: maintenance of a relatively stable internal state under a much wider range of external environmental conditions.
Temperature regulation (thermoregulation)Physiological Optima and Tolerance CurvesTolerance limits, optimaNet benefitAcclimation Lecture # 111 October 2015
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Energetics of Metabolism and
Movement
Ingestion = Assimilation + Egestion
Assimilation = Productivity +
Respiration
Productivity = Growth
+ Reproduction
Ingestion = Egestion + {Respiration + Growth
+ Reproduction}
{Assimilation}
--------------------------
----------------------Homeotherm versus Poikilotherm
Endotherm versus Ectotherm
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Body Mass, grams
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Log,
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Rabbits
Moose
Beaver
Squirrels
Racoon
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Metabolic Cost of MovementLog,
Log,
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Metabolic Cost of Movement
Log,
Log,
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Metabolic Cost of Movement
Log,
Log,
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Adaptation and Deterioration of Environment
Non-directed (random) changes in either A or B are equally likely to reduce the level of adaptation (d ) when small, but as the magnitude of undirected change increases, the probability of improvementdiminishes. Duality of Fisher’s model (A and B can be interchanged)
Ronald A. Fisher
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Water Economy in Desert
Organisms
Other Limiting Materials
Sensory Capacities and
Environmental Cues
Adaptive Suites
Design Constraints
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Heat Budgets and Thermal Ecology
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Thermoconformers
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Passive thermoconformer
Nephrurus levis
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Active Thermoregulator
Ctenophorus isolepis
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Active Thermoregulator
Ctenophorus isolepis
Thermoconformer
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Ctenotus skinks
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Ctenotus leae
Ctenotus piankai