Diatom flora of Paso de las Piedras reservoir (Argentina) I: Fam. Diatomaceae, Fam. Achnanthaceae and Fam. Eunotiaceae (O. Pennales).

Abstract

The diatom flora of Paso de las Piedras reservoir and affluents, Buenos Aires Province, was studied. In this paper we present those species and varieties that belong to the families Diatomaceae, Achnathaceae and Eunotiaceae. Each taxon, studied with light and/ or scanning electron microscope, is described and ilustrated. The taxonomic information is completed with references about geographic distribution and ecological requirements. Diatoma moniliforme Kützing, a new record for Argentina and South America is included. A brief characterization of the study area and methodology are also given.