The species and the number of Ectomycorrhizal fungi (ECM fungi) are influenced by many environmental factors, such as soil factor, climate and season, and site factor.

There is no simple or single factor that determines if a given site will be a savanna, but some factors seem to play important roles in their formation.

When probable manipulation is detected, a spam rank factor is applied to a site, depending upon the type and severity of the infraction.