Abstract

Currently the existence of toxicant resistant strains of aquatic invertebrates is of interesto Recently BRYAN (1974) noted tolerance of copper and zinc but not cadmium or lead in the polychaete Nereis diversicolor taken from polluted Engllsh estuaries. LUOMA (1977) has suggested that resistance testing may be used to indicate which contaminants are of primary concern in aquatic systems. In the current study, chlronomid larvae (Chironomus tentans) were collected from two areas, one contaminated by heavy metals and one uncontaminated, of Palestine Lake, Indiana, and subjected to a series of laboratory tests to determine if metal resistant strains have developed within the lake.

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