Hello, Actually this issue needs a large space to be clear. briefly, The ecosystem has conditional recruitments, which all living organisms should tolerate, and be resilient to sustain their lifespan. unless the intolerant species ended (migrating or becoming extinct). from this point, species diversity would initiated. that means Environmental changes -----> Species variation. If Ecosystem Stable = low level diversity.

Dr Mustafa S Faddagh Ziyadi thank you for your contribution to the discussion

Biologically diverse communities are also more likely to contain species that confer resilience to that ecosystem because as a community accumulates species, there is a higher chance of any one of them having traits that enable them to adapt to a changing environment. Maintaining high genetic diversity allows species to adapt to future environmental changes and avoid inbreeding. Inbreeding, which happens when there are small, isolated populations, can reduce a species' ability to survive and reproduce.Possibly the most widely cited is the insurance hypothesis. This suggests that more biodiversity ecosystems will be more resilient to environmental perturbations because they contain a greater number of species available to replace functions carried out by lost species. It strengthens the ability of species and populations to resist diseases, pests, changes in climate and other stresses. Gene variations underpin their capacity to evolve and their flexibility to adapt. The “resistance-resilience framework” helps us understand ecological resilience and the role resistance plays. It's easy to confuse these two closely related concepts of ecosystem change: resistance is the ability to persist or withstand a disturbance, and resilience is the ability to recover once a disturbance ends. Ecological resilience, the ability of an ecosystem to maintain its normal patterns of nutrient cycling and biomass production after being subjected to damage caused by an ecological disturbance. Biodiversity is essential for the processes that support all life on Earth, including humans. Without a wide range of animals, plants and microorganisms, we cannot have the healthy ecosystems that we rely on to provide us with the air we breathe and the food we eat. Ecosystem resilience is the ability of an ecosystem to absorb change and return to the same equilibrium state after a temporary disturbance. Ecosystems with higher species diversity tend to be more resilient. Both resistance and resilience cause an ecosystem to remain relatively unchanged when confronted to a disturbance, but in the case of resistance alone no internal re-organization and succession change is involved. This can lead to collapse of the system when a disturbance threshold is exceeded.