According to MacArthur and Wilson's theory of island biogeography, both the land area of an island and the contribute to species diversity. proximity of the island to the equator depth of the water surrounding the island rock composition of the island climate of the island distance of the island from neighboring land masses

distance from the mainland

Explanation:

The size of the island and the proximity of the island from the mainland are two important determinants if island biogeography.

Three factors are considered while discussing island biogeography. immigration, the inflow number of organisms into the island. Increase in immigration increases the rate of immigration.

emigration, on the other hand is the outflow number of organisms leaving the island.

And extinction, is seen as the number of species on the island that become extinct. Extinction rates are related to the size of the island.

Likewise, the farther the island is from sources of immigration (mainland) the less species diversity will be found in that island. This is because the island is more isolated from other plants and animals that could influence the species composition on the mainland.