Based on Simpson’s index, which is true for communities X and Y?
Simpson-based comparisons incorporate both species richness and the distribution of individuals among species. In its dominance form, D = Σpᵢ², the index is the probability that two sampled individuals belong to the same species; smaller D therefore means greater diversity. In the complementary form, 1 − D, larger values mean greater diversity. A conclusion that community X has greater alpha diversity than Y is justified when X has the lower dominance value, or equivalently the higher 1 − D value, under the same sampling effort. This can occur even if both communities contain the same number o
Ref: NCERT Biology Class 12, Ch. 15 Biodiversity and Conservation
