Zooplankton succession during extraordinary drought-flood cycles: A case study in a South American floodplain lake
We examined the zooplankton abundance and composition of Laguna Grande, a floodplain wetland of the Lower Paraná Basin (Argentina), during an extraordinary drought-flood cycle that affected both the environment and the biological conditions of the lake. Low waters were characterised by remarkably hi...
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2011
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00759511_v41_n4_p371_Chaparro http://hdl.handle.net/20.500.12110/paper_00759511_v41_n4_p371_Chaparro |
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paper:paper_00759511_v41_n4_p371_Chaparro2023-06-08T15:07:14Z Zooplankton succession during extraordinary drought-flood cycles: A case study in a South American floodplain lake Chaparro, Griselda Noemi Schiaffino, Maria Romina O'Farrell, Inés Community structure Drought-flood cycle Extreme conditions Floodplain lakes Phytoplankton Zooplankton abundance estimation community structure drought flood frequency floodplain lake ecosystem species richness succession wetland zooplankton Argentina Parana Basin Brachionus Ciliophora Copepoda Cyanobacteria Moina micrura Rotifera We examined the zooplankton abundance and composition of Laguna Grande, a floodplain wetland of the Lower Paraná Basin (Argentina), during an extraordinary drought-flood cycle that affected both the environment and the biological conditions of the lake. Low waters were characterised by remarkably high conductivities and pH values, and high phytoplankton and bacterioplankton abundances with cyanobacterial blooms, while high waters showed opposite features. In relation to zooplankton, the mean abundances of all the taxonomic groups (rotifers, cladocerans, copepods, ciliates, and heterotrophic nanoflagellates) were slightly higher at low waters. Major changes were observed in the specific composition of metazooplankton: the euryhaline species assemblage that dominated in the dry warm period was replaced by several oligohaline littoral and planktonic species characteristic of the Paraná River Basin, when the water level rose. Mean species richness values at high waters doubled those of low waters and were directly correlated to water depth. Most of the rotifers of the genus Brachionus and the cladoceran Moina micrura switched from parthenogenetic to sexual reproduction during low waters, as a response to a harsh environment and crowding. We suggest that the main changes in the environmental conditions in this eutrophic floodplain lake are driven by the hydrology, which regulates the zooplankton succession. The herein described shifts in the zooplankton structure and dynamics of Laguna Grande over an extraordinary drought-flood cycle contribute to the understanding of the processes that might occur under the scenarios predicted by climate change models. © 2011 Elsevier GmbH. Fil:Chaparro, G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Schiaffino, M.R. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:O'Farrell, I. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2011 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00759511_v41_n4_p371_Chaparro http://hdl.handle.net/20.500.12110/paper_00759511_v41_n4_p371_Chaparro |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Community structure Drought-flood cycle Extreme conditions Floodplain lakes Phytoplankton Zooplankton abundance estimation community structure drought flood frequency floodplain lake ecosystem species richness succession wetland zooplankton Argentina Parana Basin Brachionus Ciliophora Copepoda Cyanobacteria Moina micrura Rotifera |
| spellingShingle |
Community structure Drought-flood cycle Extreme conditions Floodplain lakes Phytoplankton Zooplankton abundance estimation community structure drought flood frequency floodplain lake ecosystem species richness succession wetland zooplankton Argentina Parana Basin Brachionus Ciliophora Copepoda Cyanobacteria Moina micrura Rotifera Chaparro, Griselda Noemi Schiaffino, Maria Romina O'Farrell, Inés Zooplankton succession during extraordinary drought-flood cycles: A case study in a South American floodplain lake |
| topic_facet |
Community structure Drought-flood cycle Extreme conditions Floodplain lakes Phytoplankton Zooplankton abundance estimation community structure drought flood frequency floodplain lake ecosystem species richness succession wetland zooplankton Argentina Parana Basin Brachionus Ciliophora Copepoda Cyanobacteria Moina micrura Rotifera |
| description |
We examined the zooplankton abundance and composition of Laguna Grande, a floodplain wetland of the Lower Paraná Basin (Argentina), during an extraordinary drought-flood cycle that affected both the environment and the biological conditions of the lake. Low waters were characterised by remarkably high conductivities and pH values, and high phytoplankton and bacterioplankton abundances with cyanobacterial blooms, while high waters showed opposite features. In relation to zooplankton, the mean abundances of all the taxonomic groups (rotifers, cladocerans, copepods, ciliates, and heterotrophic nanoflagellates) were slightly higher at low waters. Major changes were observed in the specific composition of metazooplankton: the euryhaline species assemblage that dominated in the dry warm period was replaced by several oligohaline littoral and planktonic species characteristic of the Paraná River Basin, when the water level rose. Mean species richness values at high waters doubled those of low waters and were directly correlated to water depth. Most of the rotifers of the genus Brachionus and the cladoceran Moina micrura switched from parthenogenetic to sexual reproduction during low waters, as a response to a harsh environment and crowding. We suggest that the main changes in the environmental conditions in this eutrophic floodplain lake are driven by the hydrology, which regulates the zooplankton succession. The herein described shifts in the zooplankton structure and dynamics of Laguna Grande over an extraordinary drought-flood cycle contribute to the understanding of the processes that might occur under the scenarios predicted by climate change models. © 2011 Elsevier GmbH. |
| author |
Chaparro, Griselda Noemi Schiaffino, Maria Romina O'Farrell, Inés |
| author_facet |
Chaparro, Griselda Noemi Schiaffino, Maria Romina O'Farrell, Inés |
| author_sort |
Chaparro, Griselda Noemi |
| title |
Zooplankton succession during extraordinary drought-flood cycles: A case study in a South American floodplain lake |
| title_short |
Zooplankton succession during extraordinary drought-flood cycles: A case study in a South American floodplain lake |
| title_full |
Zooplankton succession during extraordinary drought-flood cycles: A case study in a South American floodplain lake |
| title_fullStr |
Zooplankton succession during extraordinary drought-flood cycles: A case study in a South American floodplain lake |
| title_full_unstemmed |
Zooplankton succession during extraordinary drought-flood cycles: A case study in a South American floodplain lake |
| title_sort |
zooplankton succession during extraordinary drought-flood cycles: a case study in a south american floodplain lake |
| publishDate |
2011 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00759511_v41_n4_p371_Chaparro http://hdl.handle.net/20.500.12110/paper_00759511_v41_n4_p371_Chaparro |
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AT chaparrogriseldanoemi zooplanktonsuccessionduringextraordinarydroughtfloodcyclesacasestudyinasouthamericanfloodplainlake AT schiaffinomariaromina zooplanktonsuccessionduringextraordinarydroughtfloodcyclesacasestudyinasouthamericanfloodplainlake AT ofarrellines zooplanktonsuccessionduringextraordinarydroughtfloodcyclesacasestudyinasouthamericanfloodplainlake |
| _version_ |
1768545275958263808 |