1. Species diversity is interspecific diversity due to number of species of plants and animals that are present in a region.
2. It can be expressed by variety of species i.e. species richness as well as number of individuals of different species i.e. species evenness.
3. E.g. Species diversity is more in Western Ghats than in Eastern Ghats.
4. Natural undisturbed tropical forests have much greater species richness than monoculture plantation of timber plant, developed by forest plantation.