The Island Biogeography Model of Robert MacArthur and E

question 34

Multiple Choice

The island biogeography model of Robert MacArthur and E.O. Wilson predicts a higher value of ŝ , the equilibrium number of species, for larger islands close to a source pool and a lower value of ŝ for small islands far from the source pool. Their reasoning for these predictions is that larger islands support larger populations, lowering the risk of extinction, while closer islands have higher immigration rates because the immigrants do not have to travel as far. What other reasons could you give to justify their predictions? Check all that apply.

• A) Larger islands tend to support species that are more adaptable and therefore, less prone to extinction.
• B) Larger islands have a greater range of habitats and can support larger populations.
• C) Closer islands are more likely to have intermediate levels of disturbance, increasing diversity.
• D) Closer islands are more likely to receive immigrants of species already present on the island, and this continued immigration can "rescue" species that might have otherwise gone extinct.

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