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Mercury exposure to Red-throated Divers Gavia stellata and Black-throated Divers Gavia arctica in Sweden.

Artikel i vetenskaplig tidskrift
Författare Mats O.G. Eriksson
Peter Lindberg
Publicerad i ORNIS SVECICA
Volym 15
Sidor 1-12
Publiceringsår 2005
Publicerad vid Zoologiska institutionen, ekologisk zoologi
Sidor 1-12
Språk sv
Ämnesord mercury, aquatic food-chain, divers
Ämneskategorier Tungmetaller och övriga metaller, Biologiska vetenskaper, Limnisk ekologi

Sammanfattning

We investigated concentration of mercury in eggs of Redthroated Diver Gavia stellata and Black-throated Diver Gavia arctica collected in South and Central Sweden, 1981–1997. In South Sweden (Sydsvenska Höglandet), mean concentration in Red-throated Diver eggs was remarkably high (6.84 ppm dry weight, 5 pairs), or more than three times as high as in Black-throated Diver eggs (2.11 ppm dry weight, 16 pairs). In Central Sweden (Svealand), the concentration in Red-throated Diver eggs (3.04 ppm dry weight, 8 pairs) was significantly lower than in South Sweden, but still higher than in Blackthroated Diver eggs (1.21 ppm dry weight, 5 pairs). In Black-throated, but not in Red-throated Diver, there was higher mercury concentrations in eggs from pairs fishing in lakes affected by acidification. We found no relationship between mercury and breeding success, although concentrations in single Red-throated Diver eggs exceeded the level associated with high risk of impaired reproduction. We recommend that mercury concentration of diver eggs should be further monitored, with reference to the risks of increased exposure, related to leakage from terrestrial deposits of air-borne transmissions to freshwater habitats.

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