BIO120H1 Study Guide - Midterm Guide: Veratrum, Ecological Succession, Eichhornia Crassipes
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BIO120H1 Full Course Notes
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Document Summary
Application of spatial and metapopulation models to predict butterfly: butterfly"s caterpillars survive only in prairie, butterflies undergo annual cycles of reproduction, then disperse randomly across habitat, butterflies must discover prairie or will die without reproducing. North: doing well, big patches provide reservoirs and disperse between smaller patches(source population)-dispersing to middle patch. Middle: low stability, more variability hits zero and rebounds , here they depend on migration(sink population) Southern: straight decline, unstable hits zero and takes a while to come back, many pikas go extinct. Affected by: dispersal rate,quality of patches and proximity of patches. Model populations can be driven to extinction in several ways: Unstable predator-prey (disease-host)(eats all prey then starves) But these tendencies are countered by nonequilibrial conditions, habitat patchiness, rescueby-migration, variation in life-history strategy(some organisms are good at dispersal). Find species associations: pair of species occur together in the same stand of vegetation more often then you expect by chance(ex. beech-maple,oak-hickory)
