Question

According to the equilibrium model of island biogeography

1. immigration rate increases with the number of species on the island

2. small islands tend to have a greater rates of immigration than large islands

3. Islands that are far from the mainland tend to have a greater rates of extinction then similar islands that are close to the mainland

4. Smart islands tend to have a greater rates of extinction than larger islands

5. extinction rate decreases with increasing number of species on the island

Answer 1

3. Islands that are far from the mainland tend to have greater rates of extinction then similar islands that are close to the mainland

4. Small islands tend to have a greater rate of extinction than larger islands

The Island biogeography theory holds that the number of species on an isolated 'island' is a result of different balancing reasons such as distance of island from the mainland, the size of the island, the number of pre-existing species and the availability of food/nutrients. The theory postulates that larger islands and those that are near the mainland have the highest number of species and the highest turnover rates as species arrive at the island and become extinct.

Further, the distance of the island also plays a role in maintaining this balance. The further an island is from the mainland, the less number of new species arrive there and therefore islands further out recieve lower immigration rates, while experiencing greater extinction rates.