In the mountains of the southeastern united states, there are many similar but distinct salamander species that are restricted to particular mountaintops or ridge systems. they are found in patches of suitable high-elevation habitat, separated by unsuitable lowland areas. this distribution pattern indicates

Numerous allopatric speciation events.  

Explanation:

Allopatric speciation also called geographical speciation. It occurs when the same species from its biological perspectives become isolated due to the change in geography such as slides of the mountain or there may be changes in social perspectives such as emigration. The biological species concept is widely accepted. According to these concepts, the biologically same species become post zygotic ally isolated even then it was a second-generation but when they interbreed they could not produce a hybrid fertile. It is the geographical isolation of the population from the population of parental species.

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