Mid-late Holocene lake levels and trophic states of a shallow lake from the southern Pampa plain, Argentina
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...
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| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_11295767_v73_n2_p123_Laprida |
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todo:paper_11295767_v73_n2_p123_Laprida2023-10-03T16:07:46Z Mid-late Holocene lake levels and trophic states of a shallow lake from the southern Pampa plain, Argentina Laprida, C. Plastani, M.S. Irurzún, A. Gogorza, C. Navas, A. Valero-Garcés, B. Sinito, A.M. Argentina Mid-late Holocene Paleolimnology Southern Pampas Trophic states Holocene lake level lake water paleolimnology phytoplankton shallow water trophic status turbidity Argentina Pampas 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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_11295767_v73_n2_p123_Laprida |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Argentina Mid-late Holocene Paleolimnology Southern Pampas Trophic states Holocene lake level lake water paleolimnology phytoplankton shallow water trophic status turbidity Argentina Pampas |
| spellingShingle |
Argentina Mid-late Holocene Paleolimnology Southern Pampas Trophic states Holocene lake level lake water paleolimnology phytoplankton shallow water trophic status turbidity Argentina Pampas Laprida, C. Plastani, M.S. Irurzún, A. Gogorza, C. Navas, A. Valero-Garcés, B. Sinito, A.M. Mid-late Holocene lake levels and trophic states of a shallow lake from the southern Pampa plain, Argentina |
| topic_facet |
Argentina Mid-late Holocene Paleolimnology Southern Pampas Trophic states Holocene lake level lake water paleolimnology phytoplankton shallow water trophic status turbidity Argentina Pampas |
| description |
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. |
| format |
JOUR |
| author |
Laprida, C. Plastani, M.S. Irurzún, A. Gogorza, C. Navas, A. Valero-Garcés, B. Sinito, A.M. |
| author_facet |
Laprida, C. Plastani, M.S. Irurzún, A. Gogorza, C. Navas, A. Valero-Garcés, B. Sinito, A.M. |
| author_sort |
Laprida, C. |
| title |
Mid-late Holocene lake levels and trophic states of a shallow lake from the southern Pampa plain, Argentina |
| title_short |
Mid-late Holocene lake levels and trophic states of a shallow lake from the southern Pampa plain, Argentina |
| title_full |
Mid-late Holocene lake levels and trophic states of a shallow lake from the southern Pampa plain, Argentina |
| title_fullStr |
Mid-late Holocene lake levels and trophic states of a shallow lake from the southern Pampa plain, Argentina |
| title_full_unstemmed |
Mid-late Holocene lake levels and trophic states of a shallow lake from the southern Pampa plain, Argentina |
| title_sort |
mid-late holocene lake levels and trophic states of a shallow lake from the southern pampa plain, argentina |
| url |
http://hdl.handle.net/20.500.12110/paper_11295767_v73_n2_p123_Laprida |
| work_keys_str_mv |
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1807321366934847488 |