Highly specialized species tend to evolve on islands because of the environmental conditions and resource availability. Based on the theory of island biogeography, which of the following would most likely experience the greatest decline of specialist species if an invasive species emigrated from the mainland?

Distance to island

Explanation:

As per the theory of, the island biogeography the number of the species that are found in an undisturbed island environment are determined by the immigration and extinction of species. And if an invasive species emigrated from the mainland it would likely to experience a decline due to the distance effects that islands which are isolated more is less likely to get immigrants than an island with less isolation.