A major explanation for the decline in species richness along an equatorial polar gradient is the correlation of high levels of solar radiation and precipitation with diversity.Which of the following factors is also through to contribute to the high species richness of tropical communities ?

Options :
  1. the inverse relationship between diversity and evapotranspiration
  2. the greater age of these communities (longer growing season and fewer climatic setbacks), providing more time for speciation events
  3. the larger area of the tropics and corresponding richness predicted by the species - area curve
  4. the lack of disturbances in tropical areas
Answer and Explanation :-

Answer: Option 2


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