BIO120H1 Study Guide - Final Guide: Habitat, Plant Community
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BIO120H1 Full Course Notes
Verified Note
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Document Summary
Endangered fender"s blue butterfly-caterpillar can eat only a rare plant species (kincaid"s lupine) Life history-annual pulses of dispersal, mating and egg laying, followed by heavy larval mortality; females must find land with lupines. Pika-little alpine rabbit; lives in piles of large rocks with crevices. Tailings piles from hard-rock mining create many small replicated patches of pika habitat. North- high, stable, anchored by big reservoirs; separately-source. Middle- low, no reservoirs; extinction/renewal; separately-sink depends on import from source. Model populations can go to extinction in many ways: strong density-dependence (overshoots & crashes, unstable competition (one species outcompetes the other, unstable predator-prey (disease-host) predators eats all of prey, starves, goes extinct, allee effects at low density. But these tendencies are countered by nonequilibrial conditions (abiotic factors), habitat patchiness (animals can somehow find a patch, microhabitat, where they can survive on), rescue by-migration, variation in life-history strategy. Species associations (e. g. , beech-maple forest, oak-hickory forest, bur-oak savannah)
