Mercury in Soils, Lakes, and Fish in Voyageurs National Park (Minnesota):  Importance of Atmospheric Deposition and Ecosystem Factors

2006 ◽  
Vol 40 (20) ◽  
pp. 6261-6268 ◽  
Author(s):  
J. G. Wiener ◽  
B. C. Knights ◽  
M. B. Sandheinrich ◽  
J. D. Jeremiason ◽  
M. E. Brigham ◽  
...  
Keyword(s):  
Atmospheric Deposition ◽  
National Park ◽  
Voyageurs National Park

scholarly journals Long-Term Trends in Regional Wet Mercury Deposition and Lacustrine Mercury Concentrations in Four Lakes in Voyageurs National Park

2021 ◽  
Vol 11 (4) ◽  
pp. 1879
Author(s):  
Mark E. Brigham ◽  
David D. VanderMeulen ◽  
Collin A. Eagles-Smith ◽  
David P. Krabbenhoft ◽  
Ryan P. Maki ◽  
...  
Keyword(s):  
Atmospheric Deposition ◽  
National Park ◽  
Total Mercury ◽  
The United States ◽  
Multimedia Data ◽  
Data Sets ◽  
Mercury Deposition ◽  
Continental Scale ◽  
Voyageurs National Park

Although anthropogenic mercury (Hg) releases to the environment have been substantially lowered in the United States and Canada since 1990, concerns remain for contamination in fish from remote lakes and rivers where atmospheric deposition is the predominant source of mercury. How have aquatic ecosystems responded? We report on one of the longest known multimedia data sets for mercury in atmospheric deposition: aqueous total mercury (THgaq), methylmercury (MeHgaq), and sulfate from epilimnetic lake-water samples from four lakes in Voyageurs National Park (VNP) in northern Minnesota; and total mercury (THg) in aquatic biota from the same lakes from 2001–2018. Wet Hg deposition at two regional Mercury Deposition Network sites (Fernberg and Marcell, Minnesota) decreased by an average of 22 percent from 1998–2018; much of the decreases occurred prior to 2009, with relatively flat trends since 2009. In the four VNP lakes, epilimnetic MeHgaq concentrations declined by an average of 44 percent and THgaq by an average of 27 percent. For the three lakes with long-term biomonitoring, temporal patterns in biotic THg concentrations were similar to patterns in MeHgaq concentrations; however, biotic THg concentrations declined significantly in only one lake. Epilimnetic MeHgaq may be responding both to a decline in atmospheric Hg deposition as well as a decline in sulfate deposition, which is an important driver of mercury methylation in the environment. Results from this case study suggest that regional- to continental-scale decreases in both mercury and sulfate emissions have benefitted aquatic resources, even in the face of global increases in mercury emissions.

Stabilization of Shoreline Archaeological Sites at Voyageurs National Park

1989 ◽  
Vol 54 (4) ◽  
pp. 792-801 ◽  
Author(s):  
Mark J. Lynott
Keyword(s):  
National Park ◽  
Large Scale ◽  
Data Recovery ◽  
Archaeological Sites ◽  
Lake Levels ◽  
Large Scale Data ◽  
Park Service ◽  
Voyageurs National Park ◽  
Scale Data ◽  
Filter Fabric

Elevated lake levels resulting from dam construction in the early twentieth century is producing widespread shoreline erosion at Voyageurs National Park, Minnesota. In an effort to preserve a sample of the more significant archaeological sites, the National Park Service has initiated a program of site stabilization. Stabilization of the Clyde Creek and Sweetnose Island sites was accomplished during the winter months by transporting materials and supplies across an ice road. The use of filter fabric and turf-stabilization matting in association with large quantities of sediment and riprap have produced a new shoreline that serves to protect the respective archaeological deposits. This approach has successfully preserved these intact archaeological resources and avoided the costs associated with large-scale data recovery and curation of collections.

scholarly journals River Otter (Lontra canadensis) Killed by Wolves (Canis lupus) during Winter in Northern Minnesota

2018 ◽  
Vol 131 (3) ◽  
pp. 252-253
Author(s):  
Thomas D. Gable ◽  
Steve K. Windels ◽  
Ian C. Rautio
Keyword(s):  
Canis Lupus ◽  
National Park ◽  
Lontra Canadensis ◽  
River Otter ◽  
Gray Wolves ◽  
Mammalian Predators ◽  
Voyageurs National Park

Few accounts exist of Gray Wolves (Canis lupus) killing small sympatric mammalian predators. In January 2017, we observed a River Otter (Lontra canadensis) that had been killed by wolves on the ice in Voyageurs National Park, Minnesota. This is one of only a few documented instances of wolves killing otters.

Benefit-Cost Analysis of Voyageurs National Park

1980 ◽  
Vol 4 (6) ◽  
pp. 715-738 ◽  
Author(s):  
Allan S. Mills ◽  
Joseph G. Massey ◽  
Hans M. Gregersen
Keyword(s):  
Cost Analysis ◽  
National Park ◽  
Benefit Cost Analysis ◽  
Voyageurs National Park ◽  
Benefit Cost

scholarly journals Bedrock and soil geochemistry from Voyageurs National Park, Minnesota

2002 ◽  
Author(s):  
Laurel G. Woodruff ◽  
William F. Cannon ◽  
Connie L. Dicken ◽  
Shana Pimley
Keyword(s):  
National Park ◽  
Soil Geochemistry ◽  
Voyageurs National Park
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