BIOB50H3 Lecture 10: Lecture 10
8 Sep 2017
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Document Summary
Tolerance model early colonizers modify environment in a neutral way so they don"t make it better or worse; later species are just better at tolerating the environment. Inhibition model early colonizers inhibit other species from taking over because they want to cling to the limited resources and prevent others from taking them. None of these models explains all interactions in any one community. Biogeography study of patterns of species composition and diversity across geographic scales. Species richness varies globally: endemic species are ones that are found in only one area (usually geographically restricted species range, e. g. amazon has 1300 species whereas boreal forests in canada have 2 species. !1: alpha diversity local diversity, gamma diversity regional diversity, beta diversity spatial turnover (regional/local) Spatial scales of biodiversity: global scale. Species isolated by mountains, oceans, distances over long periods isolation leads to speciation because ancestral populations form more than one daughter species.
