Pisaster ochraceous is a predator and is a prey to sea otters and sea gulls. Its role as a keystone species has been well studied. In intertidal areas of Washington, when it was removed, the diversity of species in the area decreased.
Ecosystem Impact: keystone species
- Paine, R., S. Levin. 1981. Intertidal landscapes: disturbance and the dynamics of pattern. Ecological monographs, 51: 145-178.