Water level as the main driver of the alternation between a free-floating plant and a phytoplankton dominated state: A long-term study in a floodplain lake

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This 10-year field data study explores the relevance of water level fluctuations in driving the shift from a free-floating plant (FFP) to a phytoplankton dominated state in a shallow floodplain lake from the Lower Paraná River. The multi-year natural flood pulse pattern in the Lower Paraná River dro...

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Autores principales:	O'Farrell, Inés, Izaguirre, Irina, Chaparro, Griselda Noemi, Unrein, Fernando, Sinistro, Rodrigo, Pizarro, Haydee Norma, Rodríguez, Patricia Laura
Publicado:	2011
Materias:	Alternative states Floodplain lake Free-floating plants Phytoplankton South America Water-level chlorophyll a community dynamics cyanobacterium dominance ecosystem response El Nino-Southern Oscillation eutrophication flooding floodplain habitat quality lake ecosystem macrophyte phytoplankton satellite imagery water level Parana River Cyanobacteria
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10151621_v73_n2_p275_OFarrell http://hdl.handle.net/20.500.12110/paper_10151621_v73_n2_p275_OFarrell
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_10151621_v73_n2_p275_OFarrell
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spelling	paper:paper_10151621_v73_n2_p275_OFarrell2025-07-30T18:35:46Z Water level as the main driver of the alternation between a free-floating plant and a phytoplankton dominated state: A long-term study in a floodplain lake O'Farrell, Inés Izaguirre, Irina Chaparro, Griselda Noemi Unrein, Fernando Sinistro, Rodrigo Pizarro, Haydee Norma Rodríguez, Patricia Laura Alternative states Floodplain lake Free-floating plants Phytoplankton South America Water-level chlorophyll a community dynamics cyanobacterium dominance ecosystem response El Nino-Southern Oscillation eutrophication flooding floodplain habitat quality lake ecosystem macrophyte phytoplankton satellite imagery water level Parana River Cyanobacteria This 10-year field data study explores the relevance of water level fluctuations in driving the shift from a free-floating plant (FFP) to a phytoplankton dominated state in a shallow floodplain lake from the Lower Paraná River. The multi-year natural flood pulse pattern in the Lower Paraná River drove the ecosystem regime from a FFP-dominant state during very high waters (1998-1999) to absolute phytoplankton prevalence with blooms of nitrogen fixing Cyanobacteria during extreme low waters (2008-2009). Satellite images support the observed changes over the decade and show the decrease of the surface lake area covered by FFP as well as the modification of the spectral firm in open waters, which documents the significant increases in phytoplankton chlorophyll a concentrations. We discuss the possibility that, despite a slow eutrophication in these highly vegetated systems, water level changes and not nutrients account for the shift from a floating macrophyte community to phytoplankton dominance. Cyclic shifts may occur in response to the seasonal floodpulse, but more strongly, as indicated by our results, in association to the extreme drought and flood events related to the El Niño Southern Oscillation, which is linked to discharge anomalies in the Paraná River. © 2010 Springer Basel AG. Fil:O'Farrell, I. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Izaguirre, I. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Chaparro, G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Unrein, F. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Sinistro, R. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Pizarro, H. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Rodríguez, P. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2011 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10151621_v73_n2_p275_OFarrell http://hdl.handle.net/20.500.12110/paper_10151621_v73_n2_p275_OFarrell
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Alternative states Floodplain lake Free-floating plants Phytoplankton South America Water-level chlorophyll a community dynamics cyanobacterium dominance ecosystem response El Nino-Southern Oscillation eutrophication flooding floodplain habitat quality lake ecosystem macrophyte phytoplankton satellite imagery water level Parana River Cyanobacteria
spellingShingle	Alternative states Floodplain lake Free-floating plants Phytoplankton South America Water-level chlorophyll a community dynamics cyanobacterium dominance ecosystem response El Nino-Southern Oscillation eutrophication flooding floodplain habitat quality lake ecosystem macrophyte phytoplankton satellite imagery water level Parana River Cyanobacteria O'Farrell, Inés Izaguirre, Irina Chaparro, Griselda Noemi Unrein, Fernando Sinistro, Rodrigo Pizarro, Haydee Norma Rodríguez, Patricia Laura Water level as the main driver of the alternation between a free-floating plant and a phytoplankton dominated state: A long-term study in a floodplain lake
topic_facet	Alternative states Floodplain lake Free-floating plants Phytoplankton South America Water-level chlorophyll a community dynamics cyanobacterium dominance ecosystem response El Nino-Southern Oscillation eutrophication flooding floodplain habitat quality lake ecosystem macrophyte phytoplankton satellite imagery water level Parana River Cyanobacteria
description	This 10-year field data study explores the relevance of water level fluctuations in driving the shift from a free-floating plant (FFP) to a phytoplankton dominated state in a shallow floodplain lake from the Lower Paraná River. The multi-year natural flood pulse pattern in the Lower Paraná River drove the ecosystem regime from a FFP-dominant state during very high waters (1998-1999) to absolute phytoplankton prevalence with blooms of nitrogen fixing Cyanobacteria during extreme low waters (2008-2009). Satellite images support the observed changes over the decade and show the decrease of the surface lake area covered by FFP as well as the modification of the spectral firm in open waters, which documents the significant increases in phytoplankton chlorophyll a concentrations. We discuss the possibility that, despite a slow eutrophication in these highly vegetated systems, water level changes and not nutrients account for the shift from a floating macrophyte community to phytoplankton dominance. Cyclic shifts may occur in response to the seasonal floodpulse, but more strongly, as indicated by our results, in association to the extreme drought and flood events related to the El Niño Southern Oscillation, which is linked to discharge anomalies in the Paraná River. © 2010 Springer Basel AG.
author	O'Farrell, Inés Izaguirre, Irina Chaparro, Griselda Noemi Unrein, Fernando Sinistro, Rodrigo Pizarro, Haydee Norma Rodríguez, Patricia Laura
author_facet	O'Farrell, Inés Izaguirre, Irina Chaparro, Griselda Noemi Unrein, Fernando Sinistro, Rodrigo Pizarro, Haydee Norma Rodríguez, Patricia Laura
author_sort	O'Farrell, Inés
title	Water level as the main driver of the alternation between a free-floating plant and a phytoplankton dominated state: A long-term study in a floodplain lake
title_short	Water level as the main driver of the alternation between a free-floating plant and a phytoplankton dominated state: A long-term study in a floodplain lake
title_full	Water level as the main driver of the alternation between a free-floating plant and a phytoplankton dominated state: A long-term study in a floodplain lake
title_fullStr	Water level as the main driver of the alternation between a free-floating plant and a phytoplankton dominated state: A long-term study in a floodplain lake
title_full_unstemmed	Water level as the main driver of the alternation between a free-floating plant and a phytoplankton dominated state: A long-term study in a floodplain lake
title_sort	water level as the main driver of the alternation between a free-floating plant and a phytoplankton dominated state: a long-term study in a floodplain lake
publishDate	2011
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10151621_v73_n2_p275_OFarrell http://hdl.handle.net/20.500.12110/paper_10151621_v73_n2_p275_OFarrell
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Water level as the main driver of the alternation between a free-floating plant and a phytoplankton dominated state: A long-term study in a floodplain lake

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