Abstract
Surficial sediments were sampled with a light-weight gravity corer at 175 sites in 73 Ontario and Québec lakes and zooplankton was collected with a 225 μm mesh size net in 24 lakes. Hg concentrations in surficial sediments (0–2 cm) ranged from 3 to 267 ng g−1 dry weight with a mean of 80 ng g−1 dry weight for all sites. A regression model including organic content of sediments and the ratio of the catchment area/lake surface explained 60% of the variation in sediments Hg concentrations. Hg in zooplankton ranged from about 25 to 377 ng g−1 dw with a mean of 108 ng g−1 dw and was weakly correlated with catchment area, primary productivity and TOC. Our data indicate that an important fraction of Hg originates from the catchments, but do not show a clear west-east regional gradient for Hg concentrations in surficial sediments or in zooplankton.
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Tremblay, A., Lucotte, M., Rowan, D. (1995). Different Factors Related to Mercury Concentration in Sediments and Zooplankton of 73 Canadian Lakes. In: Porcella, D.B., Huckabee, J.W., Wheatley, B. (eds) Mercury as a Global Pollutant. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-0153-0_104
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