Question

How do species richness and relative abundance of species affect species diversity?

Answer 1

Species diversity is determined not only by the number of species within a biological community—i.e., species richness—but also by the relative abundance of individuals in that community. ... Global gradients also affect species richness.

Answer 2

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Here is your answer

Species richness :

Species richness is the number of species per unit area. The more the number in one area the more is the species richness

✔According to Alexander Van Humboldt species richness increases with increase explored area but only up to a limit on a logarithmic scale the relationship is a straight line

log S=log C+Z logA

where S=Species richness

A= Area

Z= Slope of the line

C= Y intercept