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The intertidal flat of the small inlet of Tsuyazaki, Fukuoka, western Japan, supports one of the highest population density of a deep burrower, Macoma (Macoma) incongrua (MARTENS), ever recorded. Deat...h of the clams at burrowing stage is concentrated in the mature size-classes of living population. And the primary pattern of size-frequency distribution of the dead shells derived directly from the living population at burrowing stage shows a symmetrical distribution centering around the mature size-classes of the species. This feature of primary pattern of size-frequency distribution is well demonstrated in the greater part of the dead shell assmblages in bottom sediments of the inlet. A slight size-modification of the size-frequency distribution of dead shells is observed in this species. The important factor controlling size-modification in this species is residual concentration of dead shells as a result of washing out of the sediment by tidal currents. This modification increases the variance and size-ranges without a drastic change of the form of the size-frequency histograms.show more
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