Resource availability explained variance in biomass, productivity, and species richness, as expected by the Species Energy Theory, but not evenness. Linear mixed-effects models confirmed the overall ...

species diversity, and evenness. Species richness is simply the number of species in a community. Species diversity is more complex, and includes a measure of the number of species in a community ...

This includes the richness (number), evenness (equity of relative abundance), and composition (types) of species, alleles, functional groups, or ecosystems. Biodiversity is rapidly declining ...