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Автор Brenner, Mark
Автор Whitmore, Thomas J.
Автор Curtis, Jason H.
Автор Schelske, Claire L.
Дата выпуска 1995
dc.description ABSTRACTLake Hollingsworth lies in phosphate-rich central Florida. Recent limnological data show the lake has been hypereutrophic for >25 years, but nothing was known of the lake's trophic history prior to the late 1960s. A paleolimnological study was undertaken to: 1) evaluate the distribution of organic sediments in the basin, 2) reconstruct historical water quality to determine whether the lake is naturally (edaphically) or anthropogenically nutrient-rich, and 3) assess the feasibility of reducing in-lake nutrient concentrations. Organic sediments are distributed rather uniformly above the sandy substrate. Two <sup>210</sup>Pb-dated sediment cores taken ≈0.7 km apart display similar stratigraphies with respect to density, organic matter, total C, N, P, radioisotopes, biogenic SiO<sub>2</sub>, diatoms and δ<sup>13</sup>C in organic matter. Limnetic P<sub>tot</sub> reconstructions, inferred from diatoms, show eutrophic (≈30 μg L<sup>−1</sup>) conditions in the late 1800s. Total P increased after 1920 and very high P<sub>tot</sub> concentrations (125 to >200 μg L<sup>−1</sup>) are inferred for the 1950s through 1970s. Cultural eutrophication was probably a consequence of agriculture, residential development, construction of Florida Southern College, road building, stormwater runoff and regional phosphate mining. Total P inferences in the 1980s declined to ≈65 μg L<sup>−1</sup>, reflecting soil stabilization and reduced mining activity. The historical perspective provided by paleolimnological data demonstrates that Lake Hollingsworth was naturally eutrophic, but became hypereutrophic as a consequence of anthropogenic nutrient loading. It is probably not feasible to reduce in-lake nutrient concentrations significantly in this shallow, urbanized, hypereutrophic waterbody.
Формат application.pdf
Издатель Taylor & Francis Group
Копирайт Copyright Taylor and Francis Group, LLC
Тема diatoms
Тема geochemistry
Тема <sup>210</sup>Pb
Тема paleolimnology
Тема sediments
Тема stable isotopes
Название Historical Ecology of a Hypereutrophic Florida Lake
Тип research-article
DOI 10.1080/07438149509354207
Electronic ISSN 2151-5530
Print ISSN 1040-2381
Журнал Lake and Reservoir Management
Том 11
Первая страница 255
Последняя страница 271
Аффилиация Brenner, Mark; Department of Fisheries and Aquatic Sciences, University of Florida
Аффилиация Whitmore, Thomas J.; Department of Fisheries and Aquatic Sciences, University of Florida
Аффилиация Curtis, Jason H.; Department of Geology, University of Florida
Аффилиация Schelske, Claire L.; Department of Fisheries and Aquatic Sciences, University of Florida
Выпуск 3
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