Diatomáceas Perifíticas abundantes em três córregos com diferentes ações antrópicas em Maringá, PR, Brasil

Abstract

A taxonomic study is presented of the predominant periphytic diatoms from three streams, Nazare, Guaiapo and Remo, influenced by different anthropogenic actions. Samples were taken bimonthly in three sites of the stream watercourse, headwater, middle and mouth, from July 2007 to August 2008. Twenty six predominant species was recorded, from a total of 151 identified diatoms in the analyzed samples. Seven species were abundant or dominant in the three studied streams: Eolimna minima (Grunow) Lange-Bertalot (dominant in Remo stream), Gomphonema lagenula Kutzing (dominant in Guaiapo stream), Gomphonemapumilum (Grunow) Reichardt & Lange-Bertalot and Nupelapraecipua (Reichardt) Reichardt (both dominant in Nazare stream), Geissleria aikenensis (Patrick) Torgan & Oliveira, Nitzschiapalea (Kutzing) Smith and Sellaphora seminulum (Grunow) Mann (abundant in three streams). Two species were abundant exclusively in Nazare urban stream, 13 in Remo rural streams and six in Guaiapo stream that is influenced by both environments.