Abstract
The U.S. EPA sampled 149 lakes in Florida as part of the Eastern Lake Survey. The majority of peninsular survey lakes lying south of 29° latitude have been chemically altered by livestock operations, residential development, and especially citrus agriculture. The numerous doline lakes in citrus belts are highly enriched in K, Na, Mg, Ca, Cl, and SO, because of specific grove practices; here Gran alkalinities are moderately elevated above non-cultural ‘background’ because of liming with dolomite. Seepage lakes in citrus districts also reveal pronounced but erratic enrichment in nitrate, but not P. In Highlands County their trophic state is determined by P and is thus indistinguishable from hydraulically and morphometrically similar lakes lacking cultural influences. Chemical tracers of cultural origin can be used to help resolve the hydraulic properties of regional seepage lakes, and might find application in diagnosing best management practices in their terrestrial catchments.
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