Abstract

GONZALEZ, Sara Cadavid; SANT’ANNA, Célia Leite  and  RAMIREZ, John Jairo. Planktonic cyanobacteria in the river Nare inlet of the El Peñol-Guatapé reservoir. Biota colombiana [online]. 2024, vol.25, e1118.  Epub Jan 09, 2024. ISSN 0124-5376.  https://doi.org/10.21068/2539200x.1118.

This research aims to identify the floristic composition of planktonic cyanobacteria in the river Nare inlet in the El Peñol-Guatapé reservoir and the species that are potentially toxic and formers of blooms, given the ecological and sanitary importance of the cyanobacteria and lack of information about these organisms in Colombian aquatic ecosystems. The basin of the reservoir El Peñol-Guatapé (Antioquia) has a high level of anthropogenic intervention, which has caused its eutrophication. This has been intensified in the last years during which the frequency and density of blooms of cyanobacteria have increased. Fourteen sampling tests were made between August 2014 and March 2015. The samples were collected with a plankton net (25 μm mesh) and fixed with Transeau. Fourteen taxa were identified, mainly Microcystis (Lemmermann) and Pseudanabaena (Lauterborn), known for their toxic potential. The limnological characteristics of the system reveal greenish waters with low transparency and low dissolved inorganic nitrogen and phosphorus concentrations.

Keywords : blooms; eutrophication; floristic composition; toxic potential.

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