Fluvial lateral environments in Río de La Plata basin: effects of hydropower damming and eutrophication

Author(s)

José Roberto Debastiani Júnior ^[1] ; Danilo Augusto de Oliveira Naliato ^[2] ; Gilmar Perbiche-Neves ^[3] ; Marcos Gomes Nogueira ^[4]

Affiliation

^[1] Universidade Estadual Paulista. Instituto de Biociências - Brasil

^[2] Universidade Estadual Paulista. Instituto de Biociências - Brasil

^[3] Universidade Federal de São Carlos. Centro de Ciências da Natureza - Brasil

^[4] Universidade Estadual Paulista. Instituto de Biociências - Brasil

• Document type: Journal article
• Source: Acta Limnol. Bras.; v. 28, 2016-12-19.

Abstract

Abstract Aim: Identify large-scale limnological patterns in lateral water bodies of Río de La Plata Basin, considering the influence of river damming and urban conglomerates. Methods Samplings were performed in a broad spatial scale (along 16 latitude degrees) during two seasonal periods (23 sites in summer and 20 sites in winter) for measurements of physical and chemical variables, chlorophyll a and periphyton biomass. Results Geographical distance between sites was significantly correlated with the environmental dissimilarity (Euclidean distance). Reservoir and floodplain associated sites exhibited lower phosphorus concentration. Eutrophic conditions were higher in sites close to urban areas and regions with intensive agriculture and livestock activities, which exhibited higher conductivity, concentration of nitrogen and chlorophyll a. Sites associated to reservoirs had higher periphyton biomass. Inorganic suspended matter was higher in summer whereas organic suspended matter was higher in the winter, due to contrasting rain seasonality in the upper Paraná River sub-basin. No significant correlation between the dissimilarity of the vegetation and the environmental dissimilarity or geographical distance between sites was observed. Conclusions The limnological conditions in the fluvial lateral habitats in the Río de La Plata basin are highly influenced by reservoirs construction, intensive urban occupation and rain seasonality. (AU)

• FAPESP's process: 11/18358-3 - Copepoda Cyclopoida (Crustacea) associate with macrophytes in ''La Plata'' River Basin (Argentina, Bolivia, Brazil, Paraguay and Uruguay): a taxonomic and molecular approach
• Grantee: Gilmar Perbiche Neves
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 11/23444-6 - Cladoceran (Crustacea, Branchipoda) assemblages diversity from lotic stretches adjacent areas of Rio de la Plata Basin (Argentina, Brazil, Paraguay and Uruguay)
• Grantee: Jose Roberto Debastiani Júnior
• Support Opportunities: Scholarships in Brazil - Doctorate (Direct)
• FAPESP's process: 08/02015-7 - Planktonic microcrustaceans (Cladocera and Copepoda) in reservoirs and lotic stretches of the La Plata Basin (Brazil, Argentine, Paraguay and Uruguay): taxonomy, geographical distribution and ecological attributes
• Grantee: Gilmar Perbiche Neves
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 09/00014-6 - Limnological studies of large reservoirs of the River de la Plata Basin (Brazil, Argentine, Paraguay and Uruguay): a spatial geographical approach and the influence of present and historical processes
• Grantee: Marcos Gomes Nogueira
• Support Opportunities: Regular Research Grants
• FAPESP's process: 09/11781-8 - The importance of the wetlands associated to reservoirs in the Río de la Plata basin (Argentina, Brazil, Paraguay and Uruguay) to the Cladocera fauna diversity
• Grantee: Jose Roberto Debastiani Júnior
• Support Opportunities: Scholarships in Brazil - Master