The calcium content of zebra mussel shells from eight different natural and experimental waters was analyzed. Large control Lake Superior shells have less calcium compared to large shells from the other Great Lakes. The shells' calcium content was dependent upon the environmental calcium level and the length of the growth period spent at each condition. An inverse relationship exists between the size and calcium content of zebra mussel shells. The calcium compounds (CaCO3 or CaCl2) in experimentally hardened water had no effect on shell composition.
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Roers, Marty, "The Effect of Environmental Calcium Concentrations on Zebra Mussel (Dreissena polymorpha) Shell Composition" (1993). Honors Theses. 459.