Do the Satpura hypothesis, Brij Hypothesis stands good for this ecological puzzle
The Satpura Hypothesis is not really necessary to explain these distributions. Insofar as some of these taxa genuinely require a cooler environment, this was widely available at the last glacial maximum. However, some of them may not survive in between the Himalayas and the Ghats due to widespread anthropogenic changes. In this latter context, mountains are simply those areas where anthropogenic transformation was not possible on as broad a scale as elsewhere.
It is usually due to geological or climate changes such as glaciation :)
Firstly, the Western Ghats area proves speciation related to the disintegration of the prehistoric landmass of Gondwanaland in the early Jurassic period. Secondly, the creation of India into an isolated continent and the thirdly to the Indian continent existence struggling composed with Eurasia. Overall, the combined effect together with favorable climate patterns influence high speciation and thus the Western Ghats is an Evolutionary Ecotone” reveals “Out of Africa and “Out of Asia ‘hypotheses on species dispersal and by a physical barrier like mountain range resulting in a pair of closely related species.
The flora and fauna remains closely linked to the Western Ghats and the Himalayas are assumed to from the Pleistocene epoch which lasted from over 2.5 million years ago to 11.7 thousand years ago, scientist suggested. Theoretically, the occurrence of the species is that they are remnants from the last glaciation event. Another reason might be long-term ice age, intermediate climate phases such as cold and warmer. In addition, the formation of the Himalayas by the collision of the Indian subcontinent with Eurasian mass had a major impact. Besides, repeated glacial and inter-glacial periods coupled with plate tectonic activity may changes monsoon pattern that led to a changes on similar forest microhabitat.
Hope it will be useful to understand.