BIOLOGY 3UU3 Lecture Notes - Lecture 6: Opah, Hypothalamus, Neuropeptide Y

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Marsupials 34-35c: operate at higher rates. Metabolic rates 5-fold that of ectotherms: invade niches that would otherwise be too cold to sustain functions. Large phylogenies of animals regulate temperature to roughly similar set points one reasons that allometric analyses work. Allometric analyses do not find that body temperature scales with body mass. Warm environments ectotherms have greater efficiency for growth (converting food tissue) Mammals have relatively similar body temperatures regardless of their size: mouse to maintain a temperature of ~37 c is more expensive than for a human, considerable component of the much higher gram-specific metabolic rate of mice. Very cold environments thermoregulation > 90% of energy allocation for a small animal: little for other functions, small animals also carry less fat provides insulation, length (insulation) of fur also scales less for smaller animals. Why hibernation is largely limited to small animals.

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