As the number of species present increases, new immigrants are no longer new species.
Insularity is a universal feature of Biogeography.
Colonization - The relatively lengthy persistence of an immigrant species on an island. Community - A group of potentially interacting species living in the same place at the same time. Edge Effect - A change in the physical and biological parameter of a habitat at its boundaries relative to what is found in the center. Emigration - Movement out of an area. Endemic - A species that is found in a certain region and nowhere else.