Trends in Life Orientations of Nine Infaunal Bivalve Species Based on Quantitative Measurement Data

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  • 定量的測定に基づく内生二枚貝9種における生息姿勢の傾向

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In this study we measured the life orientations of nine infaunal bivalve species quantitatively and examined tendencies and differences between species. The results indicated that the distributions of life orientation in individuals of local populations are statistically close to the Normal distribution in many species. In three species, Ruditapes philippinarum, Cyclina sinensis and Laternula marilina, the smaller the individuals are, the more of them lean their commissure plane greatly, increasing the diversity of their life position. Moreover, three closely related species, Meretrix lusoria, M. petechialis and M. lamarckii, whose shapes are hardly different, show significant differences in anteroposterior life orientation. This may indicate different behavioral characteristics under different habitat energy levels and thus reveal the meaning of life orientations.

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