BIOL 2251 Study Guide - Final Guide: Background Extinction Rate, Species Richness, Biodiversity Hotspot
Document Summary
Immigration: functions based upon the distance the island is from the mainland (the source population, mainland = source population. Island = sink population: source: immigration (in) < emigration (out, sink: immigration (in) > emigration (out) Chance of successful colonization: extinction, function of island area, smaller islands have higher extinction rates, provide fewer resources. Can be the majority of the biomass in a given area. Isolated islands far from continents support fewer species than those closer to continents: decline in richness is a result of a decline in dispersal opportunities. I = immigration rate (rate of arrival of species not already present: e = emigration rate (rate of loss of existing insular species) Dynamic equilibrium : species , extinction , species , immigration . Final review: cons, factors other than isolation and area will affect species, criticisms of the theory richness and turnover rates. Interspecific differences and interactions among species not accounted for.
