Speciation
What is speciation?
Speciation is the evolutionary process by which new biological species arise.
What could affect the bog turtle
A mountain could form and separate a population of Bog Turtles. One side of the mountain could have wetlands so the separated population wouldn't have to adapt. But the other side of the mountain could have no wetlands and just forest. So the other separated population would have to adapt to the forest. If the new species of turtle does not adapt well it could go extinct.
Above this is a video that explains what specification is in a more detailed function.
Photo used under Creative Commons from U. S. Fish and Wildlife Service - Northeast Region