Fragmentation of forests leads to allopatric speciation.
Animal species evolve differently to suit the environment.
Animal species migrate to different ecosystems.
Explanation:
Habitat fragmentation is the breaking up of an ecosystem, usually due to human activity. Allopatric speciation is the formation of new species originating from a single species caused by a physical separation or isolation between some of the members of the population. The separate/isolated groups evolve over generations into different species, who cannot produce fertile offspring with each other.
It is likely that when the animals get separated, they will have to adapt to their new environment. Adaptations will eventually lead to evolution.
When a habitat is destroyed, it can become unfit to live in. The animals may have to migrate to a new environment where they can survive to reproductive age and pass on their traits. That is, in fact, the goal in nature.
It is not true that the likelihood of speciation will decrease because deforestation can lead to reproductive isolation of organisms, resulting in speciation. The opposite, that deforestation increases the chance of speciation, is true.
The animals are likely to be separated from unrelated mates and be forced to either interbreed with related animals or inbreed with family members.
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