BIO120H1 Lecture Notes - Beagle, Founder Effect, Tangled
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BIO120H1 Full Course Notes
Verified Note
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Document Summary
Higher latitudes colder; seasonality a function of temperature (summer-winter) Lower latitudes warmer; seasonality a function of rainfall (dry season-wet season) so regions with certain combinations of moisture and temperature develop predictable, characteristic types of vegetation = biomes. Orogenic precipitation: air forced up mountainsides undergoes adiabatic cooling, precipitates on upper windward slopes. Rain shadows created on leeward slopes of mountain ranges. Maintenance of homeostasis requires energy and is often limited by constraints & tradeoffs. Sometimes sa is needed for function; sometimes particular shapes are needed for function. Example: pikas curl into a ball and have reduced ear sizes in their restrictive cold climates. Countercurrent flow maintains gradient, so heat is always flowing from outgoing blood to incoming blood. Weasels : paradoxal distribution from northern canada to northern america. Typical prey for weasels are pocket gophers tradeoff; weasels are subject to thermal stresses but this allows them to be better predators.
