Ficoflora de la laguna Don Tomás (La Pampa, Argentina)

Abstract

The work deals with the analyze composition and seasonal distribution of phytoplantonic species of Don Tomas Shallow lake during an annual cycle. Six monthly samples were collected (August 2002 to July 2003) and they were qualitatively studied. The physical and chemical parameters were registered in the same time. The index of similarity of Sorensen was made In order to determine the degree of similarity of the seasonal distribution of the taxa. The phytoplanctonic taxocenosis community richness specific of the was of 159 taxa. Groups with a noticeable seasonal distribution were showed with cluster analyzed. Four seasonal groups were identified. September, October and November correspond to the spring; the second group, summer, was integrated for December, January and February, and the third group was constituted for March, April, May, June and July. Different environmental conditions during the winter of 2002 had isolated the results of August.