Comparative Vertebrate Physiology

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Presentation transcript:

Comparative Vertebrate Physiology Metabolism

Metabolism Anabolism plus catabolism Measurement Basal metabolic rate Standard metabolic rate Field metabolic rate

Measurement Direct calorimetry Measurement of food intake and waste excretion

Measurement Indirect calorimetry Measurement of O2 utilization (must know the diet of the animal due to R.Q.)

Respiratory quotient Carbohydrates Lipids (tripalmitin)

Factors effecting metabolism Food availability (> 30 days) Long term starvation (brooding, wintering)

Factors effecting metabolism Food availability Short term starvation (30 days)

Factors effecting metabolism Thermy Greatest variation during torpor Oxygen consumption (ml/g/hr) Ambient temperature (°C) Ambient temperature (°C)

Factors effecting metabolism Activity (greatest factor)

Factors effecting metabolism Body size

Factors effecting metabolism Relationship between metabolic rate and body mass Y = a massb a: intercept, b: slope

Factors effecting metabolism Ectotherms Lizards 2 x m0.85 Endotherms Marsupials 70 x m0.75 marsupials 1000 lizards 100 Log metabolic rate 10 Log body mass

Factors effecting metabolism Mass specific metabolic rate