title: Species differences in total mercury concentration in gulls from the Gulf of Gdansk (Southern Baltic).
abstract: Aquatic birds occupy a high position in the trophic pyramid of the Baltic Sea. This means that they accumulate the greatest amount of harmful substances, including mercury, in their bodies. This element penetrates into their systems mainly via the alimentary canal. The amount of mercury absorbed from food depends on how badly the environment is polluted with this metal. The aim of this study was to discover the concentrations of total mercury (HgT) in the contour feathers, muscles, brain, lungs, liver, kidneys, heart and blood of four gull species Herring Gull (Larus argentatus), Common Gull (Larus canus), Black-headed Gull (Larus ridibundus) and Great Black-backed Gull (Larus marinus) and organic mercury (Hgorg) in the liver and brain of Herring Gull. The most important characteristic of the results obtained for the studied gulls was the statistically significant differences between the four species, probably resulting from their different diets-confirmed by stable-isotopes analysis (δ(15)N and δ(13)C). A logarithmic dependence was found between HgT in the blood and HgT in the brain of the Herring Gull. The authors suggest that among gulls burdened with the greatest mercury load, it is possible that the brain is protected by higher Hg accumulation in the muscles. The percentage share of Hgorg in the brain and liver of the Herring Gull depended on the concentration of HgT in these tissues and was always higher in the brain. In none of the cases, did the mercury levels assayed in the internal gulls' tissues exceed values associated with adverse health effects.
authors.affiliation: Department of Marine Chemistry and Environmental Protection, Faculty of Oceanography and Geography, University of Gdańsk, Al. Piłsudskiego 46, 81-387 Gdynia, Poland.
authors.forename: Emilia
authors.initials: E
authors.lastname: Szumiło-Pilarska
authors.affiliation: Department of Marine Chemistry and Environmental Protection, Faculty of Oceanography and Geography, University of Gdańsk, Al. Piłsudskiego 46, 81-387 Gdynia, Poland. Electronic address: oceagr@ug.edu.pl.
authors.forename: Agnieszka
authors.initials: A
authors.lastname: Grajewska
authors.affiliation: Department of Marine Chemistry and Environmental Protection, Faculty of Oceanography and Geography, University of Gdańsk, Al. Piłsudskiego 46, 81-387 Gdynia, Poland.
authors.forename: Lucyna
authors.initials: L
authors.lastname: Falkowska
authors.affiliation: Department of Marine Chemistry and Environmental Protection, Faculty of Oceanography and Geography, University of Gdańsk, Al. Piłsudskiego 46, 81-387 Gdynia, Poland.
authors.forename: Julia
authors.initials: J
authors.lastname: Hajdrych
authors.affiliation: Avian Ecophysiology Unit, Department of Vertebrate Ecology and Zoology, Faculty of Biology, University of Gdańsk, Wita Stwosza 59, 80-308 Gdansk, Poland.
authors.forename: Włodzimierz
authors.initials: W
authors.lastname: Meissner
authors.affiliation: Institute of Applied Radiation Chemistry, Faculty of Chemistry, Lodz University of Technology, Zeromskiego 116, 90-924 Lodz, Poland.
authors.forename: Tomasz
authors.initials: T
authors.lastname: Frączek
authors.affiliation: Department of Marine Chemistry and Environmental Protection, Faculty of Oceanography and Geography, University of Gdańsk, Al. Piłsudskiego 46, 81-387 Gdynia, Poland.
authors.forename: Magdalena
authors.initials: M
authors.lastname: Bełdowska
authors.affiliation: Waterbird Research Group KULING, Świerkowa 34/7, 81-526 Gdynia, Poland.
authors.forename: Szymon
authors.initials: S
authors.lastname: Bzoma
mesh_terms: D000818:Animals; D001921:Brain / Q000378:metabolism; D046091:Charadriiformes / Q000378:metabolism*; D004784:Environmental Monitoring; D005260:Female; D006813:Humidity; D007553:Isotope Labeling; D008099:Liver / Q000378:metabolism; D008297:Male; D008628:Mercury / Q000378:metabolism*; D009132:Muscles / Q000378:metabolism; D009928:Organ Specificity; D013045:Species Specificity
chemical_list: D008628:Mercury
keywords: Brain; Mercury; Organic mercury; Seabirds; Southern Baltic; Stable isotopes