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Changes in mercury Levels in great lakes fish Between 1970s and 2007

A number of initiatives have curtailed anthropogenic mercury emissions  in North America over the last two decades; however, various factors,  including long-range transport of global emissions, may complicate the  response of fish mercury levels to remedial actions. Since the Great  Lakes of North America are together the largest surface freshwater  body in the world and are under the influence of many complicating  factors, trends of mercury in fish from the Great Lakes can reflect  the overall impact of mercury management actions at local, regional,  and perhaps global scales. Here we present a comprehensive view of  mercury trends in Canadian Great Lakes fish using two large (total  58 7 samples), different (fillet and whole fish), and long-term  (197 s-2  7) monitoring data sets. The spatial differences in lake  trout and walleye mercury levels during this period have generally  been within a factor of 2-3 with Lakes Erie and Superior having the  lowest and highest concentrations, respectively. These spatial  differences have diminished in the recent years (2   -2  7). The  concentrations have generally declined over the three decades  (mid-197 s to 2  7); however, in recent years, the concentration  trends are flat in Lake Ontario walleye and appear to be increasing in  Lake Erie walleye. There was a mismatch in the Lake Ontario lake trout  and walleye temporal trends, which shows the importance of considering  more than one fish species for proper spatial/temporal trend assessments.

Status
In progress
Type
Project
Start Date
End Date
Researchers
Satyendra BhavsarPrincipal Investigator
Associated with 4 projects
Agencies

Funding 9 projects for a total of $50,000.00
Scope of Study
Field Investigation
Literature / Existing Data
Scale of Phenomena
Organism
Impact of Pollutants
Toxic Metals
Resource Management
Fisheries
Lake Basin Connecting Channels
Lake Erie
Lake Huron
Lake Ontario
Lake Superior
Annex Numbers
Persistent Toxic Substances
Specific Objectives for toxic substances and effluents
Surveillance and Monitoring
General
Annex
  • Annex Numbers
    Annex Numbers
    Persistent Toxic Substances
    Specific Objectives for toxic substances and effluents
    Surveillance and Monitoring
  • Annex 17

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