BSC 2011 Lecture Notes - Lecture 35: Biome, Bromomethane, Softwood
21 Apr 2015
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Bsc2011 - integrated principles of biology 2 - lecture 35: communities part 2. Number of species (richness) and the evenness of species (abundance) Values 1 to max number of species in community (when all species have equal abundance). Pi = proportion of individuals that are of the ith species (relative abundance) S = number of species in the community. Includes values 0 to natural log of maximum number of species in community. Two main climatic factors correlated with biodiversity: solar energy and water availability (evapotranspiration). High species richness in tropics a consequence of evolutionary history and climate. The equator contains 79-81 species of butterflies. The top half of north america has 3-16 species. Species richness varies with size and isolation of islands. E. o. wilson and robert macarther (1963) studied species richness in southeast asian islands. Islands within 800 kilometers of new guinea (the mainland), had a higher number of bird species than islands 800 or more kilometers away.
