BIOA02H3 Lecture Notes - Lecture 11: Primary Production, Niche Differentiation, Insular Biogeography
21 Apr 2018
School
Department
Course
Professor
43
BIOA02H3 Full Course Notes
Verified Note
43 documents
Document Summary
Distribution of species on islands is related to balance between colonization and extinction. Theory later expanded to include mainland metapopulation theory (fragmented habitats on mainland act like islands) Number of species present on an island is determined by a number immigrating from mainland or other islands and number going extinct. Empty islands have higher colonization rates because they have more available niches (so also a function of islands age: number of species function of island size and distance from nearest mainland. Islands that are closer to mainland or other islands experience rescue effect more often, so species can persist for longer periods of time (are rescued buy new immigrants) Why do tropics have more species: tropical communities are older. Diversification rates similar in tropics and temperate areas. Supports hypothesis that tropics have higher diversity because they are older: tropical species have smaller bioclimatic niches so more species can fit into an area, rapoport"s rule:
