Concentration of mercury and selenium in tissues of five cetacean species from Croatian coastal waters
Bilandžić, Nina (Croatian Veterinary Institute, Zagreb (Croatia). Department for Veterinary Public Health, Laboratory for Residue Control) | Sedak, Marija (Croatian Veterinary Institute, Zagreb (Croatia). Department for Veterinary Public Health, Laboratory for Residue Control) | Dokić, Maja (Croatian Veterinary Institute, Zagreb (Croatia). Department for Veterinary Public Health, Laboratory for Residue Control) | Đuras, Martina (Faculty of Veterinary Medicine, Zagreb (Croatia). Department of Anatomy, Histology and Embryology) | Gomerčić, Tomislav (Faculty of Veterinary Medicine, Zagreb (Croatia). Department of Biology) | Benić, Miroslav (Croatian Veterinary Institute, Zagreb (Croatia). Department for Bacteriology and Parasitology, Laboratory for Mastitis and Raw Milk Quality) | Šimić, Branimir (Faculty of Food Technology and Biotechnology, Zagreb (Croatia))
Mercury (Hg) and selenium (Se) concentrations were measured in muscle, liver, kidney, spleen and lung tissues of five cetacean species, three dolphin (Stenella coeruleoalba, Tursiops truncatus and Grampus griseus) and two whale species (Balaenoptera physalus and Ziphius cavirostris), stranded along the Croatian coast during the period 1999-2002. Statistically significant differences in Hg concentrations in muscle, spleen and lung, and Se in liver and lung of the different dolphin species were observed. Mercury levels in liver and spleen and Se levels in liver differed between young and adult T. truncatus species. A significant positive correlation between different tissue types for Hg and Se concentrations was observed. In all tissues tested, the lowest Hg and Se concentrations were found in B. physalus. Mercury concentrations were positively correlated with Se in all tissues. The results present one of few studies related to lung and spleen tissues in these mammals, particularly in the Adriatic Sea. Since very little data are available, this research provides new data on concentrations of Hg and Se in five cetacean species from the Adriatic Sea basin.
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