Answers

Jitendra
Aug 3, 2020

Hypothesis put forth by ecologists explaining the existence of greater biodiversity in tropical regions, than in temperates are:

  1. Speciation is a function of time, the temperate regions were subjected to frequent glaciation in the past, while the tropics have remained undisturbed and hence,  had longer time to evolve more species diversity.
  2. The tropical environments are less seasonal and relatively more constant and predictable than temperate regions, niche specialisation has been promoted/favoured  by such constant environments and hence, there is greater species diversity.