Answer
The recolonization of the populations may serve as a reason for the maintenance of an unoccupied niche and a habitat corridor, which is offered as a result of the gene flow and movement of individuals within different populations.
Work Step by Step
The habitat corridors allow the organisms to move across and between the populations. This causes an increased gene flow. It also makes the recolonization of the habitats possible in the areas where the populations have been lost.
Furthermore, the maintenance of an unoccupied habitat allows for those habitats to be recolonized for a population and provides plenty of resources to the populations. Therefore, the biologists want to maintain a habitat corridor and an unoccupied habitat for the species.