Asteroidea are important members of many marine benthic communities. Paine used Pisaster ochraceus to illustrate his concept of the role keystone species play in community ecology. The crown-of-thorns starfish, Acanthaster planci, is particularly well-known because it can cause extreme detrimental effects to coral reefs, particularly during population outbreaks


Photography is the art, science & practice of creating durable images by recording light. Typically, a lens is used to focus the light reflected or emitted from objects into a real image on the light-sensitive surface inside a camera during a timed exposure.
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