Impact of Extreme Droughts on Fish Assemblages in a Large South American Floodplain River
Increasing anthropogenic pressures and climate change have significantly altered the hydrological dynamics of freshwater ecosystems, particularly in Latin America. The Paraná River in the La Plata Basin has experienced prolonged droughts, leading to reduced hydrological connectivity and habitat loss...
| Main Authors: | , , , , , , , , , , |
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| Format: | Artículo |
| Language: | Inglés |
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Wiley
2025
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| Subjects: | |
| Online Access: | http://hdl.handle.net/20.500.12123/23086 https://onlinelibrary.wiley.com/doi/10.1002/eco.70062 https://doi.org/10.1002/eco.70062 |
| _version_ | 1855487063829250048 |
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| author | Espinola, Luis Alberto Simōes, Nadson Ressyé Rabuffetti, Ana Pía Contreras, Félix Ignacio Saucedo, Griselda Isabel Abrial, Elie Garelo, Nicolás Stachiotti, Leonardo Baigun, Claudio Rafael M. Blettler, Martín César María Dos Santos, Luciano Neves |
| author_browse | Abrial, Elie Baigun, Claudio Rafael M. Blettler, Martín César María Contreras, Félix Ignacio Dos Santos, Luciano Neves Espinola, Luis Alberto Garelo, Nicolás Rabuffetti, Ana Pía Saucedo, Griselda Isabel Simōes, Nadson Ressyé Stachiotti, Leonardo |
| author_facet | Espinola, Luis Alberto Simōes, Nadson Ressyé Rabuffetti, Ana Pía Contreras, Félix Ignacio Saucedo, Griselda Isabel Abrial, Elie Garelo, Nicolás Stachiotti, Leonardo Baigun, Claudio Rafael M. Blettler, Martín César María Dos Santos, Luciano Neves |
| author_sort | Espinola, Luis Alberto |
| collection | INTA Digital |
| description | Increasing anthropogenic pressures and climate change have significantly altered the hydrological dynamics of freshwater ecosystems, particularly in Latin America. The Paraná River in the La Plata Basin has experienced prolonged droughts, leading to reduced hydrological connectivity and habitat loss, which have severely impacted fish assemblages and reproduction of several species. This study analysed changes in fish assemblage structure during a prolonged hydrological drought (2021–2022) compared with regular hydrological pulse periods (2010 and 2016) in the middle Paraná River floodplain. The results show that prolonged droughts have disrupted typical temporal dynamics, restructured the fish assemblage and particularly affected the abundance and dominance of large migratory species, which account for many key ecosystem services and are the major target of local fisheries, with only sedentary and short-distance migratory species remaining dominant. Because climate models predict more frequent and severe droughts in the future, our study shows that prolonged hydrological droughts are transforming river-floodplain systems by reducing the frequency and intensity of pulse and flow pulses. This decline in hydrological variability leads to a reduced availability and diversity of habitats for fish nurseries, negatively impacting reproductive success and even affecting migratory signals essential for reproduction. As a result, species abundance and community composition are being significantly reshaped. An ecohydrological approach is recommended for sustainable water management, integrating adaptive strategies to mitigate the impacts of abnormal hydrological events, monitor ichthyofauna and maintain ecosystem services such as fisheries. |
| format | Artículo |
| id | INTA23086 |
| institution | Instituto Nacional de Tecnología Agropecuaria (INTA -Argentina) |
| language | Inglés |
| publishDate | 2025 |
| publishDateRange | 2025 |
| publishDateSort | 2025 |
| publisher | Wiley |
| publisherStr | Wiley |
| record_format | dspace |
| spelling | INTA230862025-07-18T15:05:17Z Impact of Extreme Droughts on Fish Assemblages in a Large South American Floodplain River Espinola, Luis Alberto Simōes, Nadson Ressyé Rabuffetti, Ana Pía Contreras, Félix Ignacio Saucedo, Griselda Isabel Abrial, Elie Garelo, Nicolás Stachiotti, Leonardo Baigun, Claudio Rafael M. Blettler, Martín César María Dos Santos, Luciano Neves Sequía Ecohidrología Cambio Climático Drought Ecohydrology Climate Change Fish Pescado Increasing anthropogenic pressures and climate change have significantly altered the hydrological dynamics of freshwater ecosystems, particularly in Latin America. The Paraná River in the La Plata Basin has experienced prolonged droughts, leading to reduced hydrological connectivity and habitat loss, which have severely impacted fish assemblages and reproduction of several species. This study analysed changes in fish assemblage structure during a prolonged hydrological drought (2021–2022) compared with regular hydrological pulse periods (2010 and 2016) in the middle Paraná River floodplain. The results show that prolonged droughts have disrupted typical temporal dynamics, restructured the fish assemblage and particularly affected the abundance and dominance of large migratory species, which account for many key ecosystem services and are the major target of local fisheries, with only sedentary and short-distance migratory species remaining dominant. Because climate models predict more frequent and severe droughts in the future, our study shows that prolonged hydrological droughts are transforming river-floodplain systems by reducing the frequency and intensity of pulse and flow pulses. This decline in hydrological variability leads to a reduced availability and diversity of habitats for fish nurseries, negatively impacting reproductive success and even affecting migratory signals essential for reproduction. As a result, species abundance and community composition are being significantly reshaped. An ecohydrological approach is recommended for sustainable water management, integrating adaptive strategies to mitigate the impacts of abnormal hydrological events, monitor ichthyofauna and maintain ecosystem services such as fisheries. EEA Corrientes Fil: Espínola, Luis Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto Nacional de Limnología (INALI). Laboratorio de Hidrogeología; Argentina. Universidad Nacional del Litoral. Instituto Nacional de Limnología (INALI). Laboratorio de Hidrogeología; Argentina Fil: Simōes, Nadson Ressyé. Universidade Federal do Sul da Bahia (UFSB). Centro de Formação em Ciências Agroflorestais; Brasil Fil: Rabuffetti, Ana Pía. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto Nacional de Limnología (INALI). Laboratorio de Hidrogeología; Argentina. Universidad Nacional del Litoral. Instituto Nacional de Limnología (INALI). Laboratorio de Hidrogeología; Argentina Fil: Contreras, Félix Ignacio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro de Ecología Aplicada del Litoral; Argentina. Universidad Nacional del Nordeste. Centro de Ecología Aplicada del Litoral; Argentina Fil: Saucedo, Griselda Isabel. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Corrientes; Argentina Fil: Abrial, Elie. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto Nacional de Limnología (INALI). Laboratorio de Hidrogeología; Argentina. Universidad Nacional del Litoral. Instituto Nacional de Limnología (INALI). Laboratorio de Hidrogeología; Argentina Fil: Garelo, Nicolás. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto Nacional de Limnología (INALI). Laboratorio de Hidrogeología; Argentina. Universidad Nacional del Litoral. Instituto Nacional de Limnología (INALI). Laboratorio de Hidrogeología; Argentina Fil: Stachiotti, Leonardo. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto Nacional de Limnología (INALI). Laboratorio de Hidrogeología; Argentina. Universidad Nacional del Litoral. Instituto Nacional de Limnología (INALI). Laboratorio de Hidrogeología; Argentina Fil: Baigun, Claudio Rafael M. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Investigación e Ingeniería Ambiental. Laboratorio de Ecología Pesquera Aplicada; Argentina. Universidad Nacional de San Martín. Instituto de Investigación e Ingeniería Ambiental. Laboratorio de Ecología Pesquera Aplicada; Argentina Fil: Blettler, Martín César María. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Investigación y Desarrollo en Bioingeniería y Bioinformática; Argentina. Universidad Nacional de Entre Ríos. Instituto de Investigación y Desarrollo en Bioingeniería y Bioinformática; Argentina Fil: Dos Santos, Luciano Neves. Universidade Federal do Estado do Rio de Janeiro. Laboratorio de Ictiología Teórica e Aplicada (LICTA); Brasil 2025-07-18T14:47:21Z 2025-07-18T14:47:21Z 2025-08 info:ar-repo/semantics/artículo info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion http://hdl.handle.net/20.500.12123/23086 https://onlinelibrary.wiley.com/doi/10.1002/eco.70062 1936-0584 1936-0592 https://doi.org/10.1002/eco.70062 eng info:eu-repo/semantics/restrictedAccess http://creativecommons.org/licenses/by-nc-sa/4.0/ Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) application/pdf Wiley Ecohydrology 18 (5) : e70062. (July‐August 2025) |
| spellingShingle | Sequía Ecohidrología Cambio Climático Drought Ecohydrology Climate Change Fish Pescado Espinola, Luis Alberto Simōes, Nadson Ressyé Rabuffetti, Ana Pía Contreras, Félix Ignacio Saucedo, Griselda Isabel Abrial, Elie Garelo, Nicolás Stachiotti, Leonardo Baigun, Claudio Rafael M. Blettler, Martín César María Dos Santos, Luciano Neves Impact of Extreme Droughts on Fish Assemblages in a Large South American Floodplain River |
| title | Impact of Extreme Droughts on Fish Assemblages in a Large South American Floodplain River |
| title_full | Impact of Extreme Droughts on Fish Assemblages in a Large South American Floodplain River |
| title_fullStr | Impact of Extreme Droughts on Fish Assemblages in a Large South American Floodplain River |
| title_full_unstemmed | Impact of Extreme Droughts on Fish Assemblages in a Large South American Floodplain River |
| title_short | Impact of Extreme Droughts on Fish Assemblages in a Large South American Floodplain River |
| title_sort | impact of extreme droughts on fish assemblages in a large south american floodplain river |
| topic | Sequía Ecohidrología Cambio Climático Drought Ecohydrology Climate Change Fish Pescado |
| url | http://hdl.handle.net/20.500.12123/23086 https://onlinelibrary.wiley.com/doi/10.1002/eco.70062 https://doi.org/10.1002/eco.70062 |
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