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This research was designed to evaluate the influence of mussel (Unio pictorum mancus) size on mercury concentration in mussel soft tissues. It also evaluated the relationships between calcium, mercury and selenium in the mussel tissues. The mussel populations from the deep, meso-oligotrophic Lake Maggiore and the shallow, eutrophic Lake Candia were analyzed. The mean concentration of mercury in the tissues was 0.075 mg kg-1 in Lake Maggiore mussels and 0.033 mg kg-1 in Lake Candia mussels. The local mercury content in the mussel biomass per surface unit was about eleven-fold higher in Lake Maggiore (5.99 μg Hg m-2) than in Lake Candia (0.55 μg Hg m-2). This wide difference was due firstly to the larger population density (46.86 vs 6.93 ind m-2) and secondly to the higher individual content (0.128 vs 0.079 μg Hg ind-1) in Lake Maggiore than in Lake Candia. These differences in population density and individual mercury content are the result of both biological and environmental characteristics. Lake trophy and water renewal affect population density and individual growth rate, and ultimately determine their impact on biogeochemical cycles by regulating the mussel standing stock. The relationships between mercury, calcium and selenium were taken into account. RAVERA, Oscar, Gian Maria BEONE, Maria Chiara FONTANELLA, Nicoletta RICCARDI, and Ilenia CATTANI. 2009. “Comparison Between the Mercury Contamination in Populations of Unio Pictorum Mancus (Mollusca, Bivalvia) from Two Lakes of Different Trophic State: The Oligo-Mesotrophic Lake Maggiore and the Eutrophic Lake Candia”. Journal of Limnology 68 (2):359-67. https://doi.org/10.4081/jlimnol.2009.359. More Citation Formats ACM ACS APA ABNT Chicago Harvard MLA Turabian Vancouver Download Citation Endnote/Zotero/Mendeley (RIS) BibTeX Downloads Download data is not yet available. Citations List of Cited By : Comparative sensitivity of European native (Anodonta anatina) and exotic (Corbicula fluminea) bivalves to mercury Patrícia Oliveira, Manuel Lopes-Lima, Jorge Machado, Lúcia Guilhermino Estuarine, Coastal and Shelf Science : 2015 Limnological research in the deep southern subalpine lakes: synthesis, directions and perspectives Nico Salmaso, Rosario Mosello Advances in Oceanography and Limnology : 2010 Mercury in the biotic compartments of Northwest Patagonia lakes, Argentina A. Rizzo, M. Arcagni, M.A. Arribére, D. Bubach, S. 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Registered in print in Verbania, 7-10-1959, n. 58.

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