Redial Populations of Echinostoma revolutum Developing in Snails of Different Sizes

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Abstract
Populations of Echinostoma revolutum rediae were examined in snails (Stagnicola palustris) that were 2 to 20 mm long when exposed to either 1 or 5 miracidia. In both types of infection, the number of mother rediae was proportional to the size of the snail, and the populations were larger when snails were exposed to 5 miracidia. The number of daughter rediae produced in snails of equal size when infected, and having different rates of growth, indicated that reproduction in mother rediae (as in sporocysts) is adjusted to the growth-rate of the snail.