Ecotoxicology

, Volume 20, Issue 7, pp 1659–1668 | Cite as

Bi-phasic trends in mercury concentrations in blood of Wisconsin common loons during 1992–2010

  • Michael W. Meyer
  • Paul W. Rasmussen
  • Carl J. Watras
  • Brick M. Fevold
  • Kevin P. Kenow
Article

Abstract

We assessed the ecological risk of mercury (Hg) in aquatic systems by monitoring common loon (Gavia immer) population dynamics and blood Hg concentrations. We report temporal trends in blood Hg concentrations based on 334 samples collected from adults recaptured in subsequent years (resampled 2–9 times) and from 421 blood samples of chicks collected at lakes resampled 2–8 times 1992–2010. Temporal trends were identified with generalized additive mixed effects models and mixed effects models to account for the potential lack of independence among observations from the same loon or same lake. Trend analyses indicated that Hg concentrations in the blood of Wisconsin loons declined over the period 1992–2000, and increased during 2002–2010, but not to the level observed in the early 1990s. The best fitting linear mixed effects model included separate trends for the two time periods. The estimated trend in Hg concentration among the adult loon population during 1992–2000 was −2.6% per year, and the estimated trend during 2002–2010 was +1.8% per year; chick blood Hg concentrations decreased −6.5% per year during 1992–2000, but increased 1.8% per year during 2002–2010. This bi-phasic pattern is similar to trends observed for concentrations of methylmercury and SO4 in lake water of an intensely studied seepage lake (Little Rock Lake, Vilas County) within our study area. A cause-effect relationship between these independent trends is hypothesized.

Keywords

Bioaccumulation Gavia immer Common loon Temporal trend Mercury Wisconsin Sulfate 

Supplementary material

10646_2011_759_MOESM1_ESM.pdf (94 kb)
Supplementary material 1 (PDF 94 kb)

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Copyright information

© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  • Michael W. Meyer
    • 1
    • 6
  • Paul W. Rasmussen
    • 2
  • Carl J. Watras
    • 3
  • Brick M. Fevold
    • 4
  • Kevin P. Kenow
    • 5
  1. 1.Wisconsin Department of Natural ResourcesRhinelanderUSA
  2. 2.Wisconsin Department of Natural ResourcesMadisonUSA
  3. 3.Wisconsin Department of Natural ResourcesUniversity of Wisconsin Trout Lake StationBoulder JunctionUSA
  4. 4.Integral GIS, Ecology and Science, LLCWoodruffUSA
  5. 5.U.S. Geological Survey, Upper Midwest Environmental Sciences CenterLa CrosseUSA
  6. 6.WDNR Science ServicesRhinelanderUSA

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