A new river cuts through the range of a species of terrestrial isopods, effectively ending gene flow between populations on either side and resulting in speciation.The process at work in this situation is

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Vicariance refers to the splitting of a geographic region, such as the range of a species, which results in the separation of previously connected populations. This physical barrier can halt gene flow between populations, leading to the evolution of distinct species. In this scenario, the formation of a new river has divided the range of the terrestrial isopod populations and created two separate groups that may eventually evolve into different species.

A New River Cuts Through the Range of a Species