Lacustrine responses to decreasing wet mercury deposition rates-results from a case study in northern Minnesota

Mark E. Brigham, Mark B. Sandheinrich, David A. Gay, Ryan P. Maki, David P. Krabbenhoft, James G. Wiener

Research output: Contribution to journalArticle

Abstract

We present a case study comparing metrics of methylmercury (MeHg) contamination for four undeveloped lakes in Voyageurs National Park to wet atmospheric deposition of mercury (Hg), sulfate (SO4-2), and hydrogen ion (H+) in northern Minnesota. Annual wet Hg, SO 4-2, and H+ deposition rates at two nearby precipitation monitoring sites indicate considerable decreases from 1998 to 2012 (mean decreases of 32, 48, and 66%, respectively). Consistent with decreases in the atmospheric pollutants, epilimnetic aqueous methylmercury (MeHg aq) and mercury in small yellow perch (Hgfish) decreased in two of four lakes (mean decreases of 46.5% and 34.5%, respectively, between 2001 and 2012). Counter to decreases in the atmospheric pollutants, MeHg aq increased by 85% in a third lake, whereas Hgfish increased by 80%. The fourth lake had two disturbances in its watershed during the study period (forest fire; changes in shoreline inundation due to beaver activity); this lake lacked overall trends in MeHgaq and Hg fish. The diverging responses among the study lakes exemplify the complexity of ecosystem responses to decreased loads of atmospheric pollutants.

Original languageEnglish (US)
Pages (from-to)6115-6123
Number of pages9
JournalEnvironmental Science and Technology
Volume48
Issue number11
DOIs
StatePublished - Jun 3 2014

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry

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    Brigham, M. E., Sandheinrich, M. B., Gay, D. A., Maki, R. P., Krabbenhoft, D. P., & Wiener, J. G. (2014). Lacustrine responses to decreasing wet mercury deposition rates-results from a case study in northern Minnesota. Environmental Science and Technology, 48(11), 6115-6123. https://doi.org/10.1021/es500301a