A small island off the coast of Australia in the Tasmanian sea

Ship rats are also known as black rats. They are extreme pests to farmers because they eat a wide range of crops, but they are omnivores

This statement is saying that. It is the cause of separation, not the effect of separation. I needed to read that sentence a few times to comprehend it.

Uniclonal means that the colony comes from a single ancestor and so there is no genetic variation

comparable in certain respects.