Phytoplankton of the paraná river basin

We summarize the information on the phytoplankton of the Paraná River in the Argentine stretch, comparing the density, biomass, functional groups and diversity studies of the mainstem and floodplain since the 70’s. We described the Yacyretá Reservoir and its impact downriver since it started operati...

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Detalles Bibliográficos
Autores principales: Devercelli, Melina, Zalocar de Domitrovic, Yolanda, Forastier, Marina Elizabet, Meichtry de Zaburlin, Norma
Formato: Artículo
Lenguaje:Inglés
Publicado: E. Schweizerbart'sche Verlagsbuchhandlung 2021
Materias:
Potamoplankton
Paraná
Yacyretá
Floodplain
Acceso en línea:http://repositorio.unne.edu.ar/handle/123456789/28913
Aporte de:
RIUNNE - Repositorio Institucional de la Universidad Nacional del Nordeste (UNNE) de Universidad Nacional del Nordeste
id I48-R184-123456789-28913
record_format dspace
spelling I48-R184-123456789-289132025-03-06T11:02:49Z Phytoplankton of the paraná river basin Devercelli, Melina Zalocar de Domitrovic, Yolanda Forastier, Marina Elizabet Meichtry de Zaburlin, Norma Potamoplankton Paraná Yacyretá Floodplain We summarize the information on the phytoplankton of the Paraná River in the Argentine stretch, comparing the density, biomass, functional groups and diversity studies of the mainstem and floodplain since the 70’s. We described the Yacyretá Reservoir and its impact downriver since it started operating in 1994. The spatio-temporal changes of the phytoplankton are associated to the hydrosedimentological regime. Regular variations in the hydrological phases and shorter permanent fluctuations are essential for phytoplankton maintenance, since they allow the lateral exchange with zones of higher algal accumulation in the main channel and with the floodplain. During ordinary hydrological cycles, the mainstem shows a typical potamoplankton, dominated by Aulacoseira granulata and, alternatively, with sub-dominance of Chlorococcales, Cryptophyceae at the Middle and Lower Stretch, Cyanobacteria abound at Yacyretá Reservoir and downriver at the High and the beginning of the Middle Stretch. The disruption of Yacyretá Reservoir produces profound changes in the High Paraná phytoplankton evidenced in increased density and replacement of dominant species; Cryptophyceae replaced the Bacillariophyceae. Since 2001, water transparency increased and phosphorus concentration decreased, as well as the density and diversity of phytoplankton. Since 2004, an increase in Cyanobacteria was observed with bloom of Microcystis aeruginosa that extended 220 km downstream of the dam. Anomalous hydrological cycles, related to the ENSO phenomenon produced changes in phytoplankton density and structure. During El Niño, the system maintains a relative homogeneous phytoplankton assemblage, although mean density values are significantly lower than those registered in ordinary hydrological periods. La Niña provokes a more drastic change in the community, due to the disruption in the exchange with the alluvial valley. The river-floodplain connectivity is essential for the maintenance of phytoplankton diversity. 2021-10-05T16:39:59Z 2021-10-05T16:39:59Z 2014 Artículo Devercelli, Melina, et al., 2014. Phytoplankton of the paraná river basin. Fundamental And Applied Limnology. Stuttgart: E. Schweizerbart'sche Verlagsbuchhandlung, vol. 65, p. 39-65. ISSN 1863-9135. 1863-9135 http://repositorio.unne.edu.ar/handle/123456789/28913 eng openAccess http://creativecommons.org/licenses/by-nc-nd/2.5/ar/ application/pdf application/pdf E. Schweizerbart'sche Verlagsbuchhandlung Advances in Limnology, 2014, vol. 65, p. 39-65.
institution Universidad Nacional del Nordeste
institution_str I-48
repository_str R-184
collection RIUNNE - Repositorio Institucional de la Universidad Nacional del Nordeste (UNNE)
language Inglés
topic Potamoplankton
Paraná
Yacyretá
Floodplain
spellingShingle Potamoplankton
Paraná
Yacyretá
Floodplain
Devercelli, Melina
Zalocar de Domitrovic, Yolanda
Forastier, Marina Elizabet
Meichtry de Zaburlin, Norma
Phytoplankton of the paraná river basin
topic_facet Potamoplankton
Paraná
Yacyretá
Floodplain
description We summarize the information on the phytoplankton of the Paraná River in the Argentine stretch, comparing the density, biomass, functional groups and diversity studies of the mainstem and floodplain since the 70’s. We described the Yacyretá Reservoir and its impact downriver since it started operating in 1994. The spatio-temporal changes of the phytoplankton are associated to the hydrosedimentological regime. Regular variations in the hydrological phases and shorter permanent fluctuations are essential for phytoplankton maintenance, since they allow the lateral exchange with zones of higher algal accumulation in the main channel and with the floodplain. During ordinary hydrological cycles, the mainstem shows a typical potamoplankton, dominated by Aulacoseira granulata and, alternatively, with sub-dominance of Chlorococcales, Cryptophyceae at the Middle and Lower Stretch, Cyanobacteria abound at Yacyretá Reservoir and downriver at the High and the beginning of the Middle Stretch. The disruption of Yacyretá Reservoir produces profound changes in the High Paraná phytoplankton evidenced in increased density and replacement of dominant species; Cryptophyceae replaced the Bacillariophyceae. Since 2001, water transparency increased and phosphorus concentration decreased, as well as the density and diversity of phytoplankton. Since 2004, an increase in Cyanobacteria was observed with bloom of Microcystis aeruginosa that extended 220 km downstream of the dam. Anomalous hydrological cycles, related to the ENSO phenomenon produced changes in phytoplankton density and structure. During El Niño, the system maintains a relative homogeneous phytoplankton assemblage, although mean density values are significantly lower than those registered in ordinary hydrological periods. La Niña provokes a more drastic change in the community, due to the disruption in the exchange with the alluvial valley. The river-floodplain connectivity is essential for the maintenance of phytoplankton diversity.
format Artículo
author Devercelli, Melina
Zalocar de Domitrovic, Yolanda
Forastier, Marina Elizabet
Meichtry de Zaburlin, Norma
author_facet Devercelli, Melina
Zalocar de Domitrovic, Yolanda
Forastier, Marina Elizabet
Meichtry de Zaburlin, Norma
author_sort Devercelli, Melina
title Phytoplankton of the paraná river basin
title_short Phytoplankton of the paraná river basin
title_full Phytoplankton of the paraná river basin
title_fullStr Phytoplankton of the paraná river basin
title_full_unstemmed Phytoplankton of the paraná river basin
title_sort phytoplankton of the paraná river basin
publisher E. Schweizerbart'sche Verlagsbuchhandlung
publishDate 2021
url http://repositorio.unne.edu.ar/handle/123456789/28913
work_keys_str_mv AT devercellimelina phytoplanktonoftheparanariverbasin
AT zalocardedomitrovicyolanda phytoplanktonoftheparanariverbasin
AT forastiermarinaelizabet phytoplanktonoftheparanariverbasin
AT meichtrydezaburlinnorma phytoplanktonoftheparanariverbasin
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