Suchergebnisse

Although mercury bio-amplifies through the food chain and accumulates in top predators, mercury concentrations in tissues of the wandering albatross are greater than in any other vertebrate, including closely related species. In order to explore the alternative explanations for this pattern, we measured total mercury concentrations in feathers, plasma and blood cells of wandering albatrosses of known age, sex and breeding status sampled at South Georgia. Mercury concentrations were low in feathers and blood components of chicks, and higher in the feathers of young pre-breeders than in feathers or blood of older pre-breeders and breeding adults. There was no effect of sex on mercury concentrations in the feathers of pre-breeders or breeding adults, whereas levels were significantly higher in blood cells of breeding females than males. The high feather mercury concentrations of young pre-breeders compared with older birds suggest an increase in moult frequency as birds approach maturity. ; This work was supported by the Portuguese Foundation for the Science and Technology (FCT) through a PhD grant to Sílvia Tavares (SFRH/BD/48908/2008),co-funded by the European Social Fund and Portuguese Government National Funds, and through the project POLAR. This paper represents a contribution to the British Antarctic Survey Ecosystems Programme, the national program PROPOLAR and the international programs of ICED and SCAR AnT-ERA.