Abstract
The uptake of organochlorine compounds in liver and muscle tissues of resident and migratory ducks of Walpole Island was studied during 1986. Liver concentrations of octachlorostyrene (115 μg kg −1), hexachlorobenzene (30 μg kg −1), and pentachlorobenzene (1.5 μg kg −1) were elevated in resident duck populations relative to migratory populations (56, 8.7, and 0.4 μg kg −1, respectively). Comparison of residue concentrations in resident open water ducks (redheads) with resident marsh ducks (mallards) indicated there was no significant difference (P > 0.10) between the two species. The exposure of resident duck populations suggests that the transport and fate of organochlorinated compounds in the Huron-Erie corridor are being regulated by physical and biological properties of the delta area. Low level discharges of persistent, bioaccumulating compounds into the upstream waters can result in an increasing concentration of these substances in the wetland area and in the associated food web.
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