Paleolimnological assessment of human impacts in Lake Blanca, SE Uruguay |
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| Authors: | F García-Rodríguez N Mazzeo P Sprechmann D Metzeltin F Sosa HC Treutler M Renom B Scharf C Gaucher |
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| Institution: | (1) Sección Limnología, Facultad de Ciencias, Iguá 4225, Montevideo, 11400, Uruguay (;(2) Departamento de Paleontología, Facultad de Ciencias, Iguá 4225, Montevideo, 11400, Uruguay;(3) Botanisches Institut der Universität, Siesmayerstr. 77, 60323 Frankfurt (Main), Germany;(4) Sektion Analytik, UFZ Umweltforschungszentrum Leipzig-Halle GmbH, Permoserstrasse 15, 04318 Leipzig, Germany;(5) Departamento de Meteorología, Facultad de Ciencias, Instituto de Física, Iguá 4225, Montevideo, 11400, Uruguay;(6) Gewässerforschung Magdeburg, UFZ Umweltforschungszentrum Leipzig-Halle GmbH, Brückstr. 3a, D-39114 Magdeburg, Germany |
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| Abstract: | Paleolimnological techniques were used to assess human impacts onLake Blanca, a small (0.6 km2), coastal fresh waterbodyin southern Uruguay, which is the drinking water source for  100,000 localresidents. We retrieved a core that extends to about 1100 14Cyr BP. 210Pb ages, organic mater, CO3, totalcarbon, nutrients, fossil pigments and diatoms allowed us to establishlimnological conditions before and after cultural impacts. Soil removal(1880–1960) and intensive cattle and sheep grazing (1943–1966) ledto gully formation in the catchment. This watershed erosion resulted inincreased sedimentation rates. The aquatic system appeared to be mesotrophicwith dominance of epibenthic diatoms until 1966, at which timeeutrophication intensified with forestry activities. Increases in nutrients, aswell as blooms of planktonic diatoms, were observed. During the last decade,tourist/urban development as well as high drinking water demand caused areduction in lake area. Subsequent marked increases in rainfall led to furtherphytoplankton blooms and macrophyte proliferation. |
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| Keywords: | Diatoms Erosion Eutrophication Human impacts Paleolimnology Rainfall Uruguay |
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