Tropical regions show greatest level of species richness because:
A. Tropical latitudes have remained relatively undisturbed for millions of years, hence more time was available for species diversification.
B. Tropical environments are more seasonal.
C. More solar energy is available in tropics.
D. Constant environments promote niche specialization.
E. Tropical environments are constant and predictable.
- A
A, B and E only
- B
A, B and D only
- C
A, C, D and E only
- D
A and B only
Reasons proposed for higher tropical species richness include: long evolutionary time without major disturbances (A), high availability of solar energy increasing productivity (C), niche specialization permitted by stable environments (D), and the constancy and predictability of tropical climates (E). Tropical environments are not more seasonal, so statement B is incorrect. Hence A, C, D and E.
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