Why is focusing conservation efforts on keystone species considered the highest return on investment for ecosystem health?

Answer

Protecting them yields exponential benefits for the recovery of the entire habitat.

Focusing limited resources on protecting functional linchpins offers the highest return because protecting an endangered keystone species yields exponential benefits for the recovery of the entire dependent suite of organisms and processes.

Why is focusing conservation efforts on keystone species considered the highest return on investment for ecosystem health?
speciesEcologyRolekeystone species