11. Species richness , therefore, is a sign of environmental wealth and health.12. The technique does not recognize species abundance, only species richness . 13. Plant species richness of snag forests can be much higher than in unburned forests. 14. They increase species richness and animal abundance by providing shelter and improved water quality. 15. It also demonstrated that PD led to greater preservation of'feature diversity'than species richness alone. 16. Today, overexploitation and misuse of natural resources is an ever-present threat for species richness . 17. At these points, species richness is neither increasing nor decreasing. 18. The presence of too much nitrogen can cause declines in species richness and abundance. 19. Plant species richness directly reflects spatial heterogeneity in an ecosystem. 20. Additionally, producers can increase plant and species richness through grazing, by providing an adequate habitat.
