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Comparative analysis of the phytoplankton of fifteen lowland fluvial systems of the River Plate Basin (Argentina)

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Abstract

The phytoplankton of fifteen lowland courses of the River Plate Basin is compared and characterized by means of multivariate analyses.

The cluster analysis performed with the more abundant species of each fluvial system reveals three main groups. Rivers with a high discharge and a large floodplain are grouped on the basis of the dominance of several Aulacoseira species. An eutrophic flora typified by Cyclotella meneghiniana, Synedra ulna and several green algae occurs in the smaller rivers with high conductivity, low transparency and important discharge variations. A third group comprises the Uruguay River and its tributaries, characterized by the presence of several pennatae diatoms and flagellates: Amphipleura pellucida, Surirella tenera, Terpsinoe musica, Navicula cuspidata, Eudorina elegans, Pandorina morum and Peridinium gatunense.

The Principal Component Analysis based on a data matrix of physical, chemical and hydrological parameters revealed similar results. The ordination according to the first two components reflects the geographic location of these systems in the River Plate Basin, responding to a decreasing gradient of conductivity, pH and solids and an increasing minimum temperature. The rivers were ordinated by means of a Correspondence Analysis based on the main algal groups.

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  1. Laboratorio de Limnología y Ficología. Departamento de Biologia. Facultad de Ciencias Exactas y Naturales. Pab. II, Ciudad Universitaria, Nuñez, 1428, Buenos Aires, Argentina

    Inés O'Farrell

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O'Farrell, I. Comparative analysis of the phytoplankton of fifteen lowland fluvial systems of the River Plate Basin (Argentina). Hydrobiologia 289, 109–117 (1994). https://doi.org/10.1007/BF00007413

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