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The diversity of invertebrate species competing for space in rocky intertidal communities of California is defined by the presence of a keystone predator.

A. True
B. False

Answer :

The presence of a keystone predator, like the intertidal sea star Pisaster ochraceus, is crucial for maintaining the biodiversity of rocky intertidal communities in California, as it regulates species composition by preying on mussels. Hence the correct option is (a).

The diversity of invertebrate species competing for space in rocky intertidal communities of California is indeed defined by the presence of a keystone predator.

The truth of this statement can be exemplified by the intertidal sea star, Pisaster ochraceus, which is considered a keystone species in the northwestern United States.

When Pisaster ochraceus is removed from its habitat, mussel populations skyrocket, leading to a drastic change in species composition and a significant reduction in biodiversity.

This demonstrates the critical role that keystone predators play in maintaining the balance of species in an ecosystem. Thus, the correct option is (a).

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