On an undisturbed island, the number of species is defined by: I. Immigration
II) Emigration
III) Extinction

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On an undisturbed island, the number of species is defined by all three processes. This is a key concept of island biogeography.
Key Takeaway: Island biogeography is a subset of geography that attempts to define and explain the factors that affect the species richness of natural communities. While the theory was initially designed to explain species diversity on islands, it can and is applied to any defined area not altered by human activity. The species diversity is dependent on the arrival of new species (immigration), the departure of native species (emigration), and death of species (extinction).

On an Undisturbed Island, the Number of Species Is Defined