Note: For some of the studies volunteers also collected and processed (including filtration for chlorophyll) water samples that were later analyzed by professionals.
Bruhn, L.C., and P.A. Soranno. 2005. Long term (1974-2001) volunteer monitoring of water clarity trends in Michigan lakes and their relation to ecoregion and land-use/cover. Lake and Reservoir Management 21(1):10-23. This study uses Secchi data from Minnesota’s Citizen Lake Monitoring Program to analyze trends on 71 lakes.
Heiskary, S.A., and C.B. Wilson. 1989. The regional nature of lake water quality across Minnesota: An analysis for improving resource management. Journal of the Minnesota Academy of Science 55(1)71-77. This analysis of hundreds of Minnesota lakes uses Secchi data collected between 1977 and 1987 by Minnesota’s Citizen Lake Monitoring Program.
Macdonald, R.H., G.A. Lawrence, and T.P. Murphy. 2004. Operation and evaluation of hypolimnetic withdrawal in a shallow eutrophic lake. Lake and Reservoir Management 20(1):39-53. A 9-year Secchi depth dataset collected by volunteer monitors was the main data used in evaluating the effects of a drawdown on a Canadian lake.
Smeltzer. E., and S.A. Heiskary. 1990. Analysis and applications of lake user survey data. Lake and Reservoir Management 6(1):109-118. Secchi disk readings by the Vermont Lay Monitoring Program and Minnesota’s Citizen Lake Monitoring Program, as well as professional chlorophyll and total phosphorus measurements on volunteer-collected water samples, were paired with user perceptions of lake quality.
Smeltzer, E., R.A. Kirn, and S. Fiske. 1999. Long-term water quality and biological effects of alum treatment of Lake Morey, Vermont. Lake and Reservoir Management 15:173-184. The study used Secchi data from the Vermont Lay Monitoring Program. www.anr.state.vt.us/dec/waterq/lakes/docs/lp_morey-alum-jlrm1999.pdf