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- W7262413 abstract "Lake Miccosukee is a 2,500 hectare karst lake in northwest Florida. The lake draws water from a 65,000 hectare watershed, although groundwater seepage appears to be the principal water source to the lake. Like many of the large lakes of north Florida it periodically drains via sinkholes, becoming nearly dry in the process. The result of the natural drawdowns is a large reduction of the organic matter content of the bottom sediments. The water level in the lake was stabilized after 1954 with the construction of a dike and weir. Drawdowns have been managed since then and have been fewer and less drastic. The lake bottom has been exposed for only about six months since 1954. The result has been an increase in aquatic vegetation and a diminishment in fish populations. A set of two dozen sediment cores was analyzed for sedimentation rate (using lead-210 and Cs-137), percent organics, C, N, P and trace metals. The effect of the lake level stabilization appears to be an increase in organic matter deposited in the bottom sediments. Anthropogenic metals, including Hg, Zn, Pb, Cu and V have been found to increase considerably near the tops of the cores, by a factor ofmore » two or more over long-term background levels.« less" @default.
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- W7262413 date "1994-03-01" @default.
- W7262413 modified "2023-09-26" @default.
- W7262413 title "Geochemical history of Lake Miccosukee, Florida" @default.
- W7262413 hasPublicationYear "1994" @default.
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