Why does the number of species on an island level off at S?

Question

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All of these factors contribute to the equilibrium number of species on an island. As more species colonize an island, resources become scarcer, predation may increase, extinction rates may rise due to competition and other factors, and colonization rates may decrease as fewer new species find the island or are able to establish themselves. This dynamic balance is described by the theory of island biogeography.

Why Does the Number of Species on an Island Level