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Description: (a) The interaction of immigration rate and extinction rate produces an equilibrium number of species on an island, ?. ? varies from 0 species to P species, the total number of species available to colonize. (b) ? varies according to the island's size and distance from the mainland. An increase in distance (near to far) lowers the immigration curve, while an increase in island area (small to large) lowers the extinction rate.
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