DARWINIANA

34(1-4):251-266, 1996

FLORA DIATOMOLOGICA DEL EMBALSE PASO DE LAS PIEDRAS (ARGENTINA) I: FAM. DIATOMACEAE, FAM. ACHNANTHACEAE Y FAM. EUNOTIACEAE (O. PENNALES)*

SILVIA E. SALA

Departamento Científico Ficología, Facultad de Ciencias Naturales y Museo, Paseo del Bosque s.n. 1900. La Plata

ABSTRACT: Sala, S.E. 1996. Diatom flora of Paso de las Piedras reservoir (Argentina) I: Fam. Diatomaceae, Fam. Achnanthaceae and Fam. Eunotiaceae (O. Pennales). Darwiniana 34: 251-266.

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, Achanthaceae 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.

* Este trabajo forma parte de la Tesis Doctoral titulada "Flora diatomológica del Embalse Paso de las Piedras, Provincia de Buenos Aires", realizada bajo la dirección de la Dra. Martha E. Ferrario, Facultad de Ciencias Naturales y Museo, U.N.L.P