Two Species of Barnacles, Stellate and Rock Barnacles, Occupy the Rocky

question 190

Multiple Choice

Two species of barnacles, stellate and rock barnacles, occupy the rocky intertidal zone of the Scottish coast and illustrate factors that can determine species distribution in a community.Larvae of both species settle throughout the intertidal zone, but adult barnacles occupy specific zones.The smaller stellate barnacle lives only in higher zones, where the environment dries out between high tides.The larger, faster-reproducing rock barnacle lives only at lower zones.In general, the intertidal zonation seen in the barnacles is due to

• A) parasitism and predation.
• B) competitive interactions and predation.
• C) susceptibility to abiotic conditions and parasitism.
• D) predation and differential susceptibility to abiotic conditions.
• E) competitive interactions and differential susceptibility to abiotic conditions.

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