Island biogeography

A) The theory states that species richness (number of species) on islands is determined by both the size of the island and its distance from a mainland (source of species). Among the basic tenets are the following: Larger islands tend
to have higher immigration rates and lower extinction rates than smaller islands. As a result, larger islands have more species than smaller islands. If two islands are the same size, they have equal rates of extinction. However, the one closer to the mainland has a higher rate of immigration and therefore a larger number of species.

B) The equilibrium species number would be approximately 8.

C) Line C would represent the new rate of immigration and line A’ would remain the rate of extinction. Rate of extinction is a factor of island size (and therefore of habitat availability); as a result it is generally not affected by distance from
the mainland.

D) The new equilibrium species number would be between 10 and 11.

I needed this too, thanks dude.

You're welcome.