CAPE Biology Unit 1 · 2005 · Paper 2 · Question 9(b)(ii)

A single species of green tortoise in a homogeneous habitat experienced climate change, forming two distinct habitats in the same region. Environmental pressures led to brown tortoises in one habitat and green tortoises in the other. The green and brown tortoises cannot interbreed.

Identify the type of speciation that occurred and indicate the mechanisms that contributed to it.