BIO 2129 Lecture Notes - Lecture 16: Insular Biogeography, Species Richness, Biogeography
21 Nov 2016
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Individuals can immigrate more easily to islands that are close to the mainland. Immigration declines as distance from the mainland increases because: Mortality increases with distance from the mainland: extinction rates are lower on large islands, species richness on islands represents a trade-off between immigration and extinction, by: Variations in proximity to mainland affect equilibrium species richness values, s* S = ca z log(s) = log(c) + zlog(a) Relate to the islands being studied and particular ecological characteristics of the species inhabiting them. So according to island biogeography, species richness increases rapidly at first and then more slowly as area increases. The theory of island biogeography provided testable mechanisms for area effects. Simberloff tested this theory, in the mangrove islands of florida. Using island biogeography, diamond (1975) argued that, for parks: larger is better, more connected is better argued that several small reserves in different areas will have relatively few.
