Ott, J.A., R.M. Duffy, S.E. Erickson, K.S. Fuhr, B.A. Rodgers, and M.A. Schneider. 2006. Comparison of light limiting water quality factors in six Florida aquatic preserves. Florida Scientist 69(00S2):73-91.
The study uses six years of monthly Secchi and salinity data from eight estuaries collected by the Charlotte Harbor Estuaries Volunteer Water Quality Monitoring Network. www.charlotteharbornep.org