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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
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
Body Mass, grams
Log,
Rabbits
Moose
Beaver
Squirrels
Racoon
Metabolic Cost of MovementLog,
Log,
Metabolic Cost of Movement
Log,
Log,
Metabolic Cost of Movement
Log,
Log,
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
Water Economy in Desert
Organisms
Other Limiting Materials
Sensory Capacities and
Environmental Cues
Adaptive Suites
Design Constraints
Heat Budgets and Thermal Ecology
Thermoconformers
Passive thermoconformer
Nephrurus levis
Active Thermoregulator
Ctenophorus isolepis
Active Thermoregulator
Ctenophorus isolepis
Thermoconformer
Ctenotus skinks
Ctenotus leae
Ctenotus piankai
