Substrate Preference of Kalamazoo River Clams
Kaskie, Stephen J.
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This study is an effort to assess the substrate preference of freshwater clams of the Family Unionidae. By mechanically analyzing and comparing the various substrates in which these clams are found and by observing the migratory behavior of these clams when placed in different substrates, this study has demonstrated a definite preference of substrates by Unionids. In this study, the migratory pattern of two species of freshwater. clams of the Family Unionidae, Pleurobema coccineum (Conrad) and Anodonta marginata (Say), were observed in five different substrattes. These five substrates, gravel, fine gravel, sand, mud, and sludge, were mechanically analyzed for water content and volume of dried earth in order that each substrate could be compared to the natural substrate of each species. From the observations made on each of the above species, a hypothesis relating migration and soil texture with substrate preference is proposed which would generally apply to clams of the Family Unionidae.