Explain the theory of island biogeography. use the example of the siberian tiger to describe how this theory can be applied to fragmented terrestrial landscapes

The theory of Island Bio geography attests that species on islands, while derived from common ancestors, evolved to become unique species in isolation. The Siberian tiger for example, migrated from the Northern Siberian region across terrestrial landscapes. It's ancestors included the North American bobcat and other big cats across the Bering Strait.