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

Answer: Option E. Isolation by both, first dispersal and then vicariance.

First, the populations separate by dispersal and then divergence occurs due to vicariance.

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