CONTRIBUTIONS OF SPECIES RICHNESS AND SPECIES EVENNESS TO SPECIES DIVERSITY
FIGURE 4.1 (a) A population of a single butterfly species has zero species diversity. (b) A community of six butterfly species that is dominated numerically by one of the six species has low species evenness. (c) A community of six species is equal in species richness to community (b) but, with all species equally abundant (highest possible species evenness), is higher in species diversity compared with community (b).