BIOLOGY 3UU3 Lecture Notes - Lecture 5: Kiwi, Ungulate, Megatherium
4 Apr 2016
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Document Summary
Across species, temperature tends to be constant across close relaives. Diferences between birds, mammals (eutherians and marsupials) and poikilotherms. Principle of allocaion tradeofs (if you give to one thing, it takes away from something else) Allocaion principle based on the idea of some ixed resource not a free-for-all, each species has a program. Allometry as you get smaller, surface area becomes large relaive to body mass, lose a lot more heat. Mouse exposed to cold, there are lots of adaptaions, no energy let for reproducion. Use photoperiodic signals to anicipate what"s coming to prepare (feed-forward mechanisms) Iguanas vs rabbits if iguanas eat 1 kg of food, they grow slowly, but don"t allocate as much energy towards thermoregulaion (more iguana made from 1 kg of food than for rabbit) Log-log plot slight deviaions from the line are actually big. Predict sloths to have lower body temperatures live in the tropics.
