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5/24/2018  |   2:00 PM - 2:15 PM   |  A DECADAL ASSESSMENT OF ANTHROPOGENIC IMPACTS TO STREAMS OF NORTHERN MICHIGAN   |  420 A

A DECADAL ASSESSMENT OF ANTHROPOGENIC IMPACTS TO STREAMS OF NORTHERN MICHIGAN

Human actions at the landscape scale are a threat to the ecological integrity of rivers. Some watersheds of Marquette County, Michigan are relatively pristine while others have a long history of logging, mining, and road construction, which have affected the stream habitat, water quality, and biota. These watersheds provide an opportunity to understand long-term anthropogenic stressors. We implemented an annual water-quality monitoring program for 26 sites beginning in 2007 that encompasses a range of anthropogenic influences, which includes data before and during construction and operation of a nearby nickel mine. We evaluated macroinvertebrate community composition, nutrients, water quality parameters, metal concentrations, and habitat conditions at all sites. A habitat assessment provided perspective on changes to the system indicating declining habitat quality over 10 years, while the macroinvertebrate data was highly variable. Site-specific differences in sensitive taxa displayed larger inter-annual variation at sites impacted by construction than isolated sites, potentially due to increased siltation. This study demonstrates that long-term data sets can differentiate between natural variation and anthropogenic changes in stream ecosystems, and can be used to pin-point specific stressors.

  • Bioindicators
  • Invertebrate
  • Habitat

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Presenters/Authors

Donna Kashian (), Wayne State University, dkashian@wayne.edu;


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Ashley Burtner (), Cooperative Institute for Great Lakes Research, aburtner@umich.edu;


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Corey Krabbenhoft (), University of Minnesota, krabb012@umn.edu;


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