Abstract
Two sites wilh elevated levels of lead (Pb) were selected at Weston's Mill Pond and Farrington Lake in central New Jersey, U.S.A. Lead concentrations in surficial sediments and overlying waters were significantly higher in Weston's Mill Pond than in Farrington Lake. Concentrations of lead in molluscs reflected the degree of lead contamination in the two sites. The gastropods, Physa integra, Pseudosuccinea columella, Helisoma trivolis and Idropoma malleata had the highest lead concentrations. The changes in lead concentration over time in the grazing snails ( P. integra, P. columella and H trivolis) appeared to be more strongly correlated to dissolved lead concentrations in water than concentrations in the ‘aufwuchs’, macrophytes, or various sediment fractions. Campeloma decisum had the lowest lead concentrations despite its close association with the contaminated sediments. No strong correlations were noted between lead concentrations in this burrowing prosobranch and those in deriving waters, interstitial waters, or various sediment fractions. The extent of habitat contamination only partially determined the lead concentrations in the species studied.
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