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Mayfly Metric of the Lake Erie Quality Index: Design of an Efficient Censusing Program, Data Collection, and Development of the Metric

Kenneth A. Krieger, Ph.D.; Mr. Ed Hammett

Three objectives were addressed in this project: (1) recommend a subset of reference stations for sampling mayflies in the western and central basins based on the analysis of accumulated information from ongoing data collections; (2) census mayfly nymph densities in May and June 2002 at over 30 central basin stations and at seven reference stations in the western basin; (3) apply new and previous data to modify the methodology for the mayfly metric in a revised Lake Erie Quality Index (LEQI).

Collections of mayfly nymphs in 2002 were accomplished aboard the R/V Pike operated by Mike Bur, Drew Jones, and Dr. Martin Stapanian of the US Geological Survey (USGS) Lake Erie Biological Station in Sandusky, Ohio, as well as Rich Stickel of the USGS Great Lakes Science Center (GLSC) in Ann Arbor, Michigan. Heidelberg College students Justin Harris and Ron Maichle assisted with field collections and analyzed the samples. Advice on statistical approaches and other aspects of this project were provided by Dr. R. Peter Richards of the Water Quality Laboratory, Dr. Jan Ciborowski of the University of Windsor, and the participants in the mayfly workshop held at Heidelberg College in February 2002. Don Schloesser, USGS GLSC, generously permitted inclusion of his western basin data for 1999-2002 in the analyses. Nancy Miller provided invaluable assistance in administering the grant and workshop.
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