Keystone species:
Foundation Species:
Umbrella Species:
Indicator Species:
Ecosystem Engineers:
e.g Beavers create dams in the streams, which slows the movement of water. Behind the beaver dam, a pond of still water is formed. This pond is then colonized by animals and plants that typically live in lakes rather than streams.
e.g. Trees, corals, and giant kelps are good examples of autogenic engineers.