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Patterns and Interpretation of Mercury Exposure in Freshwater Avian Communities in Northeastern North America

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Abstract

A large data set of over 4,700 records of avian mercury (Hg) levels in northeastern North America was compiled and evaluated. As Hg emissions remain poorly regulated in the United States and Canada, atmospheric deposition patterns and associated ecological responses continue to elicit interest by landscape managers, conservation biologists, policy makers, and the general public. How avian Hg exposure is interpreted greatly influences decision-making practices. The geographic extent and size of this data set is valuable in understanding the factors that affect the exposure of Hg to birds. Featured are differences found among tissues, major aquatic habitats and geographic areas, between age class and gender, and among species. While Hg concentrations in egg and blood reflect short-term Hg exposure, Hg concentrations in liver and feather provide insight into long-term Hg exposure. Blood is a particularly important matrix for relating site-specific exposure to methylmercury (MeHg). The level of MeHg is generally 5–10x greater in adults compared to nestlings. Age also influences MeHg bioaccumulation, particularly for individuals where MeHg intake exceeds elimination. Gender is of interpretive concern when evaluating Hg exposure for species exhibiting sexual dimorphism and niche partitioning. Based on two indicator species, the belted kingfisher (Ceryle alcyon) and bald eagle (Haliaeetus leucocephalus), we found MeHg availability increased from marine, to estuarine and riverine systems, and was greatest in lake habitats. A large sample of >1,800 blood and egg Hg levels from the common loon (Gavia immer) facilitated a suitable comparison of geographic differences. Although some clusters of highly elevated Hg exposure (i.e., blood levels >3.0 μg/g, ww and egg levels >1.3 μg/g, ww) were associated with hydrological and biogeochemical factors known to increase MeHg production and availability, others were not. Geographic areas without a relationship between Hg exposure and biogeochemical processes were associated with emission or waterborne point sources. Differences in Hg exposure among species are primarily correlated with trophic position and availability of MeHg. Although piscivorous species were repeatedly shown to have some of the highest MeHg levels of the 38 species analyzed, insectivorous birds in both aquatic and terrestrial habitats (such as montane areas) were also found with elevated MeHg levels. A better understanding of the factors confounding interpretation of Hg exposure provides an effective basis for choice of indicator species and tissues according to 12 selected scenarios. This and the national need for spatiotemporal monitoring of MeHg availability require careful consideration of indicator species choice. Only then will local, regional, continental, and even global monitoring efforts be effective.

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Authors and Affiliations

  1. BioDiversity Research Institute, 19 Flaggy Meadow Rd., Gorham, ME, 04038, USA

    David C. Evers, Wing M. Goodale & Theresa Daigle

  2. Canadian Wildlife Service, Environment Canada, 6 Bruce St., Mt. Pearl, NL, Canada, A1N 4T3

    Neil M. Burgess

  3. Canadian Wildlife Service, Environment Canada, Ste-Foy, Québec, Canada, G1V 4H5

    Louise Champoux

  4. United States Environmental Protection Agency, Technology Dr., N. Chelmsford, 01863, MA, USA

    Bart Hoskins

  5. U.S. Fish and Wildlife Service, Concord, NH, 03301, USA

    Andrew Major

  6. Trace Element Research Lab, Texas A&M University, College Station, TX, 77843, USA

    Robert J. Taylor

  7. School of Veterinary Medicine, University of Pennsylvania, Kennett Square, PA, 19348, USA

    Robert Poppenga

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  1. David C. Evers
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Evers, D.C., Burgess, N.M., Champoux, L. et al. Patterns and Interpretation of Mercury Exposure in Freshwater Avian Communities in Northeastern North America. Ecotoxicology 14, 193–221 (2005). https://doi.org/10.1007/s10646-004-6269-7

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