Bivalves: Spatial and Size-Frequency Distributions of Two Intertidal Species

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Science  02 Aug 1968:
Vol. 161, Issue 3840, pp. 479-480
DOI: 10.1126/science.161.3840.479


Individuals of Mulinia lateralis are randomly distributed over a homogeneous area (0.25 square meter) of a mudflat. Second-year individuals of Gemma gemma also are randomly distributed, but its total population is aggregated because of its ovoviviparous habit. As expected for two species having different life histories, their size-frequency distributions are very different, the indication being that the nature of a size-frequency curve may not be a reliable index of the degree of transport or integrity of a fossil assemblage.

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