インドネシアパリ島の砂浜棲二枚貝の生態

概要

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The following five species of bivalves were recorded from the intertidal sandy beach of Pari Island, northwestern Java, Indonesia : Atactodea striata, Davila plana, Latona faba, Asaphis violascens and Gafrarium tumidum. The first two species were relatively common, and they were found living in the intertidal zone where the substrate was made up of loose sand grains. They were not found subtidally. The other three species were substantially less frequent or even rare, but they may be found subtidally as well. On the basis of population density and the frequency of occurrence, Atactodea striata was the dominant species. It was found in all transects that were made and one transect even showed a pure population of this species. Davila plana was second in abundance. The lateral distribution of A. striata displayed a more extended distribution than D. plana which showed the tendency of occupying the lower tidal level. As regard the vertical distribution within the substrate, A. striata occupied the surface layer, D. plana the upper mid-layer and Asaphis violascens the bottom layer. The length frequency distribution of A. striata took the form of normal, unimodal curve, suggesting that there was no definite spawning seasonality in this species.
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