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Trophic State Evolution and Nutrient Trapping Capacity in a Transboundary Subtropical Reservoir: A 25-Year Study

Author

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  • Davi Gasparini Fernandes Cunha

    (Universidade de São Paulo, Departamento de Hidráulica e Saneamento, Escola de Engenharia de São Carlos)

  • Simone Frederigi Benassi

    (Itaipu Binacional)

  • Patrícia Bortoletto de Falco

    (Fundação da USP)

  • Maria do Carmo Calijuri

    (Universidade de São Paulo, Departamento de Hidráulica e Saneamento, Escola de Engenharia de São Carlos)

Abstract

Artificial reservoirs have been used for drinking water supply, other human activities, flood control and pollution abatement worldwide, providing overall benefits to downstream water quality. Most reservoirs in Brazil were built during the 1970s, but their long-term patterns of trophic status, water chemistry, and nutrient removal are still not very well characterized. We aimed to evaluate water quality time series (1985–2010) data from the riverine and lacustrine zones of the transboundary Itaipu Reservoir (Brazil/Paraguay). We examined total phosphorus and nitrogen, chlorophyll a concentrations, water transparency, and phytoplankton density to look for spatial and temporal trends and correlations with trophic state evolution and nutrient retention. There was significant temporal and spatial water quality variation (P

Suggested Citation

  • Davi Gasparini Fernandes Cunha & Simone Frederigi Benassi & Patrícia Bortoletto de Falco & Maria do Carmo Calijuri, 2016. "Trophic State Evolution and Nutrient Trapping Capacity in a Transboundary Subtropical Reservoir: A 25-Year Study," Environmental Management, Springer, vol. 57(3), pages 649-659, March.
    • Handle: RePEc:spr:envman:v:57:y:2016:i:3:d:10.1007_s00267-015-0633-7
    DOI: 10.1007/s00267-015-0633-7
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