Factors Influencing the Growth and Relative Growth of Acmaea Digitalis, A Limpet

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Abstract
Two forms of Acmaea digitalis, a limpet, one found on sandstone faces of the marine littoral zone, the other found associated with the gooseneck barnacle, Pollicipes polymerus, differ in their relative length—height growth rates. The limpets characteristic of the barnacle beds increased in height faster than did the rock—dwelling forms. Growth rate of the barnacle—associated limpets showed correlation with the growth rate of the Pollicipes. Both relative and absolute growth rates of these limpets may be functions of the selective action of intertidal physical factors, as affected by the relationship of the limpets to their homesites.

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