Total and Methyl Mercury Concentrations in Seabird Feathers and Eggs
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Seabirds are used frequently as indicators of mercury contamination in marine ecosystems, but few studies have examined the forms of mercury found in seabird tissues. Here we compare concentrations of total and organic mercury in feathers (n = 5) of six sympatric nesting seabirds and in egg components of Leach’s storm-petrels from Machias Seal Island, New Brunswick, Canada, during the 2006 breeding season. Essentially all (82–133%) mercury found in seabird feathers and egg components was methyl mercury, with no interspecific differences in percentage methyl mercury. This pattern is consistent with the hypothesis that feather-molt and egg production eliminate toxic methyl mercury, while inorganic forms from demethylation in the liver remain in internal tissues. Additional studies across more species, and comparisons with percentage methyl mercury in internal tissues, are required to validate this theory.
KeywordsMercury Mercury Concentration Methyl Mercury Total Mercury Total Mercury Concentration
We thank G. Bouchard, T. Clarke, and M.-P. Godin for assistance in the field, A. Patterson (Bold Coast Charter Co., Cutler, Maine) for providing safe transportation to the island, E. Yumvihoze for performing lab analyses, and T. Jardine and D. Lean for many stimulating conversations on this topic and assistance throughout the process. Comments from J. Lavers, R. Lavoie, D. Lean, and two anonymous reviewers improved the manuscript. This is ACWERN publication number UNB-71.
- Agusa T, Matsumoto T, Ikemoto T, Anan Y, Kubota R, Yasunaga G, Kunito T, Tanabe S, Ogi H, Shibata Y (2005) Body distribution of trace elements in black-tailed gulls from Rishiri Island, Japan: age-dependent accumulation and transfer to feathers and eggs. Environ Toxicol Chem 24:2107–2120CrossRefGoogle Scholar
- Bond AL (2007) Patterns of mercury burden in the seabird community of Machias Seal Island, New Brunswick. M.Sc., University of New BrunswickGoogle Scholar
- Burger J (1993) Metals in avian feathers: bioindicators of environmental pollution. Rev Environ Toxicol 5:203–311Google Scholar
- Burger J, Gochfeld M (2002) Effects of chemicals and pollution on seabirds. In: Schreiber EA, Burger J (eds) Biology of marine birds. CRC Press, New York, pp 485–525Google Scholar
- Goodale MW, Evers DC, Meirzykowski SE, Bond AL, Burgess NM, Otorowski CI, Welch LJ, Hall CS, Ellis JC, Allen RB, Diamond AW, Kress SW, Taylor R (2008) Marine foraging birds as bioindicators of mercury in the Gulf of Maine. EcoHealth (in review)Google Scholar
- Magat W, Sell JL (1979) Distribution of mercury and selenium in egg components and egg-white proteins. Proc Soc Exp Biol Med 161:458–463Google Scholar
- Spalding MG, Frederick PC, McGill HC, Bouton SN, Richey LJ, Schumacher IM, Blackmore CGM, Harrison J (2000) Histologic, nerologic and immunologic effects of methylmercury in captive Great Egrets. J Wildl Dis 36:423–435Google Scholar
- UNEP (2002) Global mercury assessment. United Nations Environmental Programme—Chemicals, Geneva, SwitzerlandGoogle Scholar
- Weiner JG, Krabbemhoft DP, Heinz GH, Scheuhammer AM (2003) Ecotoxicology of mercury. In: Hoffman DJ, Rattner BA, Burton GA Jr, Cairns J Jr (eds) Handbook of ecotoxicology. 2nd edn. CRC Press, New York, pp 409–463Google Scholar