Mid-late Holocene lake levels and trophic states of a shallow lake from the southern Pampa plain, Argentina

  • Cecilia Laprida | chechulaprida@gmail.com Universidad de Buenos Aires, Argentina.
  • Maria S. Plastani Universidad de Buenos Aires, Argentina.
  • Alicia Irurzún Universidad Nacional del Centro de la Provincia de Buenos Aires (UNCPBA), Argentina.
  • Claudia Gogorza Universidad Nacional del Centro de la Provincia de Buenos Aires (UNCPBA), Argentina.
  • Ana M. Navas Estación Experimental Aula Dei, Spain.
  • Blas Valero-Garcés Instituto Pirenaico de Ecologia, Spain.
  • Ana M. Sinito Universidad Nacional del Centro de la Provincia de Buenos Aires (UNCPBA), Argentina.

Abstract

Changes in trophic status of the shallow Lake La Brava (southeastern Pampa plain of Argentina) are evaluated based on geochemical, biological and sedimentological data. Based on a conceptual framework, we propose that the lake level defines the water column mixing conditions, affecting internal lake processes and determining the transparency of lake water. The shift between alternative states is reconstructed for the last ~4800 years. Four main lake stages have been recognized, although short term shifts characterize all stages. A turbid phytoplankton-dominated state prevailed between ~4700-4500 cal yr before present (BP). Drier conditions and low lake levels pushed the lake to a clear state until 2000 cal yr BP. Afterwards the lake switched back to a turbid state, and these conditions persisted until ~200 cal yr BP. In the last 200 years, the lake switched back and forth between clear and turbid states. The latter represents the modern conditions of the lake since ~1950 AD. These shifts can be attributed mainly to climatic drivers.

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Author Biographies

Cecilia Laprida, Universidad de Buenos Aires
Departamento de Ecologia Genetica y Evolución -FCEN - Instituto de Estudios Andinos Don Pablo Groeber - CONICET -
Maria S. Plastani, Universidad de Buenos Aires
Instituto de Estudios Andinos “Don Pablo Groeber” CONICET. Departamento de Ciencias Geológicas
Alicia Irurzún, Universidad Nacional del Centro de la Provincia de Buenos Aires (UNCPBA)
Instituto de Física Arroyo Seco.
Claudia Gogorza, Universidad Nacional del Centro de la Provincia de Buenos Aires (UNCPBA)
Instituto de Física Arroyo Seco.
Ana M. Sinito, Universidad Nacional del Centro de la Provincia de Buenos Aires (UNCPBA)
Instituto de Física Arroyo Seco.
Published
2014-04-24
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Issue
Section
Original Articles
Supporting Agencies
CONICET, Universidad de Buenos Aires, CICYT
Keywords:
Mid-late Holocene, paleolimnology, trophic states, southern Pampas, Argentina.
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How to Cite
1.
Laprida C, Plastani MS, Irurzún A, Gogorza C, Navas AM, Valero-Garcés B, Sinito AM. Mid-late Holocene lake levels and trophic states of a shallow lake from the southern Pampa plain, Argentina. J Limnol [Internet]. 2014Apr.24 [cited 2021May9];73(2). Available from: https://jlimnol.it/index.php/jlimnol/article/view/jlimnol.2014.830