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Changes in Mercury Methylation in a Boreal Wetland Previously Enriched in Sulfate: Synergistic Effects of Atmospheric Deposition and Water-level Fluctuations

This study will examine this relationship between sulfate and methyl-  mercury more closely. In particular, it will examine what happens to   methyl-mercury levels within a wetland when sulfate deposition   levels that were previously elevated are decreased to a normal   level. This mimics the change that has actually taken place over   much of the Great Lakes region over the past 15 years due to   improved controls on sulfur emissions. It also examines the extent   of the benefits of further sulfur emission reductions and how   rapidly they might be seen. Additional experimental techniques will   be used to examine the influence of water level fluctuations on   mercury methylation in wetlands. Prior evidence suggests the extent   and timing of these fluctuations is an important determinant of   methyl-mercury production.    The experiment is taking place at the Marcell Experimental Forest in   Northern Minnesota. The results will be applicable to similar   ecosystems, which are common across the Great Lakes basin.    (mercury methylation); (mercury); (Hg); (toxic metal); (toxic   metals); (Minnesota); (wetland); (wetlands); (chemicals of concern);   (chemical of concern)

Status
In progress
Type
Project
Start Date
End Date
Scope of Study
Field Investigation
Laboratory Investigation
Theoretical
Scale of Phenomena
Biochemical
Ecosystem
Physical/Chemical
Impact of Pollutants
Nutrients, Including Phosphorus
Toxic Metals
Land Use and Habitat
Wetlands
State Province
Minnesota
Region Being Monitored
Coastal Wetlands
Resource Being Monitored
Human Health
Wildlife
Program Drivers
Integrated Atmospheric Deposition Network
Lakewide Management Plans (LaMP)
Beneficial Use Impairment Assessments
Bird or Animal Deformities or Reproduction Problems
Fish Tumours or Other Deformities
Loss of Fish and Wildlife Habitat
Restrictions of Fish and Wildlife Consumption
Tainting of Fish and Wildlife Populations
Annex Numbers
Airborne Toxic Substances
Remedial Action Plans and Lakewide Management Plans
Research & Development
Specific Objectives for toxic substances and effluents
Annex 17
Ecotoxicity and toxicity effects of pollutants related to developing Annex 1 specific objectives
Effects of varying lake levels and relation to pollution sources, fate and effects
General
Monitoring
Annex
  • Annex Numbers
    Annex Numbers
    Airborne Toxic Substances
    Remedial Action Plans and Lakewide Management Plans
    Research & Development
    Specific Objectives for toxic substances and effluents
  • Annex 17
    Annex 17
    Ecotoxicity and toxicity effects of pollutants related to developing Annex 1 specific objectives
    Effects of varying lake levels and relation to pollution sources, fate and effects

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Great Lakes - St. Lawrence Region.