BIOL 353 Lecture Notes - Lecture 7: Insular Biogeography, E. O. Wilson, Niche Differentiation
18 Jan 2018
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Document Summary
Number of species is related to number of colonizing species and number of extinction species. Equilibrium species richness affected by: size of island (affects immigration, proximity to mainland (affects extinction) Dan simberloff and eo wilson: emptied an island and studied the rate of return, saw that mostly they went back to how they were, but not always. Null hypothesis to the niche theory: at any given level trophic, birth rates and death rates and dispersal and speciation rate are all equivalent for all species. Niche: response of species to its biotic and abiotic factors. Niche by charles elston: effect species has on its environment. Fundamental niche: theoretical occupied area (removal experiment: different niche, enough resources for both species. Niche breadth: tolerance to environmental conditions (bigger, more tolerant, more generalist) Niche compression occurs when competing species reduce niche breadth of a species: when competitor removed competitive release. Two similar niches: competitive exclusion, niche partitioning.
