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Effects Of Reservoir Drawdown On Riffle Macroinvertebrate Communities, Christian Hayes, David Mahan

Science and Mathematics Faculty Publications

In 2007 Keystone Pond, a reservoir behind the Boardman dam, Boardman River, Grand Traverse County, Michigan, USA was drawn down in preparation for dam removal. The objective of this study was to quantify the effects of drawdown on benthic macroinvertebrate riffle communities by comparing a downstream site in a newly formed channel to an upstream control. Since 2008 a total of 2338 macroinvertebrates have been sampled and identified to the lowest practical taxonomic level. Data were analyzed using Chi-Square goodness of fit tests, Simpson's Index of diversity, and Sørensens' Quotient of Similarity. We found that macroinvertebrate communities in the new …