In order to know the flora of planktonic cyanobacteria, 24 water samples (May 2010-October 2013) from the Riogrande II Reservoir, Colombia (75832 0 30 0 W-75826 0 10 0 W and 6833 0 50 0 N-6828 0 07 0 N) were studied. The reservoir provides water to 1.4 million inhabitants in Medellin, Colombia (40 % of the total population). Among the cyanobacteria, we identified 11 morphospecies belonging to three families of the order Chroococcales (Merismopediaceae (2 species), Microcystaceae (3) and Synechococcaceae (1)), one of Oscillatoriales (Pseudanabaenaceae, 1 species) and one of Nostocales (Nostocaceae, 4 species). The genera with the highest number of taxa were Microcystis Kützing ex Lemmermann and Dolichospermum (Ralfs ex Bornet et Flahault) Wacklin, Hoffmann & Komárek, both known to form dense blooms, many of them toxic. That is why the aim of this research is to understand the cyanobacterial species richness in the reservoir.

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samplings at 8 stations in the Riogrande II Reservoir (Colombia) were undertaken. It is located in a high-mountainous tropical (75°32'30'' W -75°26'10'' W and 6°33'50'' N -6º28'07''N), which supplies water to a plant treatment for public supply and to a small hydroelectric plant. The basins of the two main tributaries of the reservoir are highly impacted by human activity. We report the presence of a Dolichospermum lemmermannii, which up to now has only been registered as a temperate and high latitude species. Also the general ecology of the species is established, such as, generation and renewal times, spatial and temporal patterns, and interaction with more important environmental variables.