Boston, MA Using 120 years of feathers from natural history museums in the United States, Harvard University researchers have been able to track increases in the neurotoxin methylmercury in the black-footed albatross (Phoebastria nigripes), an endangered seabird that forages extensively throughout the Pacific.
The study shows that the observed increase in methylmercury levels, most likely from human-generated emissions, can be observed and tracked over broad time periods in organisms that live in the Pacific Ocean.
The study was published in an online early edition on April 18, 2011, in the Proceedings of the National Academy of Sciences.
The study has important implications for both environmental and public health, say the authors. "The Pacific in particular warrants high conservation concern as more threatened seabird species inhabit this region than any other ocean," said lead author Anh-Thu Vo, who did her research while an undergraduate at Harvard and is currently a graduate student at the University of California, Berkeley. "Given both the high levels of methylmercury that we measured in our most recent samples and regional levels of emissions, mercury bioaccumulation and toxicity may undermine reproductive effort in this species and other long-lived, endangered seabirds."
The researchers collected feathers from black-footed albatross specimens in the Harvard University Museum of Comparative Zoology and the University of Washington Burke Museum of Natural History and Culture and analyzed methylmercury in samples from 1880 to 2002. They found increasing levels of methylmercury that were generally consistent with historical global and recent regional increases in anthropogenic mercury emissions.
"Methylmercury has no benefit to animal life and we are starting to find high levels in endangered and sensitive species across marine, freshwater, and terrestrial ecosystems, indicating that mercur
|Contact: Todd Datz|
Harvard School of Public Health