For two populations A and B, there are situations in which there is a two way exchange of individuals between the populations, and there are situations in which there is no exchange of individuals between the populations. I have thought before of a situation involving one way isolation between two populations, in which it's easy for individuals from population A to immigrate to population B, but impossible for members of population B to immigrate to population A.

Are there any examples of the one way isolation I mentioned between populations?

Any example for marine populations?

Do you know the names of any of the specific species that would be examples of this?

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