In the rocky intertidal zone, along the coast of the state of Washington, space on the substrate (rocks) is a critical resource for sessile (attached) organisms, such as algae, barnacles, and mussels, and also for other organisms that graze the algae or prey on the sessile animals. For example, limpets graze the algae, and three species of barnacle dominate the algae for space. Among them they form a dominance hierarchy, with the larger Semibalanus dominating Balanus, which in turn dominates the smaller Chthamalus. The mussel, Mytilus, is at the top of this hierarchy. A large thaid snail feeds on Balanus and Chthamalus but cannot take the larger Semibalanus or the mussel. The starfish, Pisaster, however, prefers to feed on mussels and the large barnacle Semibalanus. Thus, if the starfish i

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    intraspecific competition
    a keystone species
    interspecific competition
    all of the above

asked May 30, 2013 in Biology by anonymous

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all of the above
answered May 31, 2013 by Bioshare ~Top Expert~ (34,070 points)

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