Imagine you have a single population of organisms living on an island. At some p

Question

Imagine you have a single population of organisms living on an island. At some point a "new" island emerges near our original island due to volcanic activity in the area. Now imagine that part of the original population of organisms travels to this new island where they become geographically isolated and begin to diverge due to the differences in their local selective environment. Is this an example of geographic isolation by dispersal or by vicariance?

A. The hypothetical example involves neither dispersal nor vicariance.

B. Vicariance.

C. Dispersal

D. It is an example of isolation by both: vicariance first and then dispersal.

E. It is an example of isolation by both: dispersal first and then vicariance.

Explanation / Answer

Ans. D. It is an example of isolation by both: vicariance first and then dispersal.

(explanation - Individuals from the original population gets isolated from the original island when they move to the new island after its emergence. This is called vicariance since it includes splitting of original population by formation of biological structure. Later, they diverged from the new island due to the differences in their local selective environment. This is dispersal.)

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