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Abundance and Altitudinal Distribution of Ephemeroptera in an Andean-Patagonean River System (Argentina)

  • M. Laura Miserendino
  • Lino A. Pizzolán

Abstract

The distribution patterns of the Ephemeroptera found in a river system of the Patagonian Cordillera (Chubut, Argentina) were analyzed. The system extends along a 1000 m altitudinal gradient and exhibits a marked perturbation in its middle reach owing to the organic sewage discharged by the city of Esquel. Eight ephemeropteran species were identified. Species distributions were determined by altitude, stream order, water temperature, conductivity, total alkalinity, and biochemical oxygen demand. Metamonius sp and Meridialaris chiloeensis proved to be stenothermic, M. laminata characterized the reaches of higher stream order, while Baetis sp. and M. chiloeensis were the species most affected by organic sewage.

Keywords

Biochemical Oxygen Demand Total Alkalinity Altitudinal Gradient Stream Order Water Quality Indicator 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media New York 2001

Authors and Affiliations

  • M. Laura Miserendino
    • 1
  • Lino A. Pizzolán
    • 1
  1. 1.Laboratorio de Ecología AcuáticaUniversidad Nacional de la Patagonia, Sede EsquelEsquelArgentina

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