Islands close to mainland show:
“High colonization and low extinction” for islands close to mainland show. This relationship follows from the ecological mechanism represented by the terms in the item, not merely from an association between their names. At equilibrium, species identities can continue to turn over even when richness is approximately stable. The model predicts a balance of rates, not an absence of colonization or extinction. The remaining alternatives—“High colonization and high extinction”, “Low colonization and low extinction”, “Low colonization and high extinction”—refer to different states, processes, or sc
Ref: The Theory of Island Biogeography, MacArthur & Wilson, Ch. 2-4