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Title: Vertical Distribution of Mollusks on the Rocky Intertidal of Easter Island 
Author: Osorio, Cecilia; Cantuarias, Victor
Date: 1989-10
Publisher: University of Hawaii Press
Citation: Osorio C, Cantuarias V. 1989. Vertical distribution of mollusks on the rocky intertidal of Easter Island. Pac Sci 43(4): 302-315.
Abstract: Horizontal and vertical distribution of mollusks was studied in the
rocky intertidal of Easter Island (27°09' S,109°26' W) in January and again in
September 1986. Organisms are zoned from the upper to the lower intertidal. In
the upper horizon dominant species are Nodilittorina pyramidalis pascua, Rehderella
belyaevi, Nerita sp., and Planaxis akuana, together with crustaceans, decapods
and echinoderms. In the middle horizon dominant species are Plaxiphora
mercatoris, Dendropoma sp., Antisabia sp., and Pilosabia sp. Mid-horizon pools
support algae; the only relatively abundant coral, Porites lobata; numerous
gastropods such as Stomatella and Euplica; crustaceans; and echinoderms. In the
lowest horizon Cypraea caputdraconis and Echinometra insularis are dominant.
The latter species is a rock borer that builds "pots" forming microhabitats shared
with other organisms. Some specimens of Dendropoma, Pocillopora, and
Echinostrephus were also found in this horizon. No great differences in distribution
of organisms among the south, northeast, and northwest sectors of the
island were distinguished in an index of similarity. Distribution patterns at
Easter Island are comparable with those in other tropical areas where the same
families and genera are found. At Easter Island the species are different because
of the high degree of endemism among the mollusks.
ISSN: 0030-8870

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