Foundation species alter the habitats of other species, improving it for the benefit of the organisms that reside there.
Keystone species support biodiversity; their extinction can significantly change the dynamics of a group. A community is defined by the arrangement of the various species that live there and how those arrangements alter through time.
Non-native species that have been introduced into an area and may be stronger competitors and reproduce more quickly than native species are known as invasive species. They often upset the ecological equilibrium.
Despite its relatively low numerical abundance, a keystone species has a significant, stabilizing impact on the entire ecological community.
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