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- W2067230409 abstract "Two discrete shell morphs of the acorn barnacle Chthamalus anisopoma coexist on rocky intertidal shores in the northern Gulf of California. One morph (called conic) has the conical shape characteristic of acorn barnacles, while the other morph (called bent) has the rim of the barnacle's aperture oriented perpendicular (rather than parallel) to its base. The results of a companion study show that development of the bent morph is induced by a carnivorous gastropod (Acanthina angelica), that bents are more resistant than conics to attack by this predator, and that the risk of predation is spatially heterogeneous. The purpose of the present study was to determine if bents are less fit than conics in the absence of predation by Acanthina, a necessary condition for the predator- induced developmental switch to bents to be resistant to invasion and replacement by the unconditional strategy always grow bent over. Four alternative hypotheses were tested: bents (1) are poorer competitors for space, (2) grow slower, (3) reproduce later, and (4) are less fecund than conics. The results of field experiments gave no evidence to suggest that bents are inferior competitors for primary space. Bents, however, were found to be both less fecund and slower growing than conics. Because of the multiplicative effect of growth and fecundity on fitness, the cost of being bent is expected to be high, and a necessary condition for maintenance of the barnacle dimorphism is met." @default.
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- W2067230409 date "1986-08-01" @default.
- W2067230409 modified "2023-10-02" @default.
- W2067230409 title "Competition, Comparative Life Histories, and Maintenance of Shell Dimorphism in a Barnacle" @default.
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- W2067230409 doi "https://doi.org/10.2307/1939808" @default.
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