Abstract

SALAZAR-SANCHEZ, MARGARITA; NAUNDORF-SANZ, GERARDO  and  MEDINA-TOMBE, MARIO. COMPOSITION, DYNAMIC AND ABUNDANCE OF THE PHYTOPLANKTON COMMUNITY IN A LAKE WITH WATER OF VOLCANIC ORIGIN. Luna Azul [online]. 2011, n.33, pp.46-60. ISSN 1909-2474.

The composition and dynamics of phytoplankton in the Aguas Tibias lake , Coconuco, Puracé, is presented in this article. Monthly sampling was performed from October 2006 to June 2007. Temperature, pH, dissolved oxygen, conductivity and nutriments (N and P) were measured. Phytoplankton was identified and quantified. Fifty-five genera were identified being Diatomophytas the dominant group, followed in importance by Cyanophyta, and Zygophyta Euchlorophyta. In the Aguas Tibias lake the Tabellaria (19.25%), Anomoeoneis (10.45%), Navicula (7.73%) and Chlamydomonas (7.33%) genera were the most abundant in the water column, compared with the Selenastrum (0.06%), Gyrosigma (0.01%), and Xantidium (0.02%) genera which showed low presence. The variations detected are not statistically significant, both in terms of space (depth) and time (sampling months). Very high values for calcium, alkalinity, calcic and total hardness and electric conductivity , due, in part, to the volcanic origin of the waterbody. Based on the kinds of algae found, the lake is proposed to be recognized as a mesotrophic ecosystem.

Keywords : Ecology; waters of volcanic origin; phytoplankton; mesotrophic ecosystem; Puracé volcano.

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