Biodiversity is very important for ecosystem functioning. More diverse ecosystems are considered more stable. Stable communities are resilient and resistant to change. Hence, diversity stabilises the community and also helps in increasing the productivity. Higher the biodiversity of an ecosystem, higher the number of species and therefore, lower is the rate of extinction. While, in case of low biodiversity, there are higher chances of extinction.
Extinction of even one or two key species has negative impacts on the entire ecosystem.
Thus, the diversity ensures the stability and proper functioning of the entire ecosystem as explained via the ‘Rivet popper hypothesis’.