Biology 2483A Lecture Notes - Lecture 17: Insular Biogeography, Spatial Scale, Species Richness
3 Jan 2018
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Document Summary
Patterns of species diversity and distribution vary at global, regional and local spatial scales. Global patterns of species diversity and composition are influenced by geographic area and isolation, evolutionary history and global climate. Regional differences in species diversity are influenced by area and distance, which determine the balance between immigration and extinction rates: patterns of species diversity and distribution vary at global, regional and local spatial scales. Higher diversity in the tropics: patterns of species diversity at different spatial scales are interconnected. Measures of species richness at different spatial scales. Regional species pool = all the species that could be present in a community. Alpha = what species are in the community. Beta = compare adjacent communities within a region: local and regional processes interact to determine local species diversity. Blue = what matters is dispersal, what gets to a community depends entirely on what disperses towards it from a neighbouring community.
