Describing biodiversity Species Diversity-a measure of the number of different species present in an area Two kinds of species diversity Species richness: number of different kinds of species In an area Taxonomic richness: the number of different taxonomic categories of the species present in an area Species diversity is influenced by climatic events ntroduction of new species size of the area, and human activitiesDescribing Biodiversity • Species Diversity – a measure of the number of different species present in an area. – Two kinds of species diversity ™ Species richness Species richness: number of different kinds of species in an area. ™ Taxonomic richness Taxonomic richness: the number of different taxonomic categories of the species present in an area. – Species diversity is influenced by climatic events, introduction of new species, size of the area, and human activities