BIO130H1 Lecture Notes - Lecture 2: Blubber
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BIO130H1 Full Course Notes
Verified Note
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Document Summary
Lecture 2: species ranges and the physical challenges of the environment: heat balance. Chemical reacts within organisms (enzyme function) occur at optimum temperature and osmotic conditions where fitness is maximized. Two types of tolerance: ranges of tolerance, geographical range: corresponds to biomes usually but not always e. g. behavioural habitat selection, other organisms e. g. extirpation of wolves leading to coyote expansion, generalist vs. specialist. Conduction direct contact with substrate (e. g. , feet lose heat to ground) Convection heat transfer mediated by moving fluid (usually air or water) Redistribution circulatory system redistributes heat among body parts, esp. core to appendages. Want high sa to volume area to get rid of heat. Bergmann"s rule: homeotherms tend to be larger at higher latitudes (colder) Elephants aren"t truly an exception to bergmann"s rule because of allen"s rule: Allen"s rule: appendanges reduced in cold climates and gets larger in warm climates. Max sa:v ratio is chrysopelea gliding snake in borneo.
