ENVB 305 Lecture Notes - Lecture 13: Biogeography, Null Model
28 Aug 2016
School
Department
Course
Professor
Document Summary
Large islands support more species than small islands . Darlington"s rule- a 10x increase in area results in a doubling of species present. Island can be colonized by a subset of p. Probability of colonization is inverse to the distance from the source. Probability of extinction is inversely proportional to area. Colonization and extinction is not dependent on composition (non-interactive, no competition) Immigration rate is relative to the area of the island. A larger island will likely have more immigration. A smaller island will likely have less immigration. The mainland distribution can be used to predict the species on islands. Null model- entertains the idea that nothing has happened, or that a change has not been produced by a cause of interest. A pattern-generating model based on randomization from a distribution designed to produce a pattern that would be expected in the absence of a particular mechanism.
