Infaunal sand-dwelling molluscs at Hila, Ambon, Indonesia
1997
Kohn, A.J. (University of Washington, Seattle, Washington (USA). Dept. of Zoology)
This study analyses a rich and diverse assemblage of benthic molluscs occupying an extensive sand patch on a fringing reef platform on Ambon Island, Maluku, Indonesia, with emphasis on species composition, abundance and trophic roles. The quantitative sample included 188 living milluscs, an average density of 42 square m. More than 70 percent were gastropods; neogastropods dominated the assemblage with respect to diversity, abundance and, except for one large scaphopod, body size. The 30 gastropod species included 4 neotaenioglossans, 20 neogastropods, and 6 heterogastropods. Fourteen additional gastropod species were present but did not occur in the quantitative sample. Bivalves comprised 21 percent and scaphopods 8 percent numerically. Among the gastropods, Oliva was the dominant genus numerically; its four species comprised nearly one-third of the entire sample. O. carneola (56 individuals) was the commonest species in the quantitative sample. Terebra ranked second in abundance but first in diversity with 12 species, four of which were present in the quantitative sample. Predators dominated the assemblage, but knowledge of the specific trophic roles of most awaits further study.
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