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The Establishment of Populations of Balanus pacificus Pilsbry (Cirripedia) and their Elimination by Predatory Turbellaria

Ann C. Hurley
Journal of Animal Ecology
Vol. 44, No. 2 (Jun., 1975), pp. 521-532
DOI: 10.2307/3609
Stable URL: http://www.jstor.org/stable/3609
Page Count: 12
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The Establishment of Populations of Balanus pacificus Pilsbry (Cirripedia) and their Elimination by Predatory Turbellaria
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Abstract

(1) Lack of recruitment rather than predation and competition after metamorphosis keeps Balanus pacificus out of the interiors of large rocky areas. (2) Availability of cleared substrate sets an upper limit on the abundance of B. pacificus. (3) Competition after metamorphosis is unimportant in determining abundance in the areas where B. pacificus is common. (4) Predation by two species of polyclad flatworms is the major cause of mortality in B. pacificus populations.

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