Abstract

GONZALEZ, Marco et al. Microbiological quality of the water of the Quilotoa volcanic lake. Cotopaxi-Ecuador. Rev.Cs.Farm. y Bioq [online]. 2021, vol.9, n.1, pp.13-27. ISSN 2310-0265.

Abstract Introduction: The water of volcanic lakes is not sterile, in it a microbiota with different metabolic capacities has adapted over millennia. The microorganisms of volcanic lakes in Ecuador have been little studied and their quantity and diversity are still unknown. Objective of the work was to know the microbiological quality of the water of Lake Quilotoa, located in the Province of Cotopaxi-Ecuador. Methodology: Two samplings were carried out during 2019, collecting a total of 32 samples. Microbiological quality was quantified using the membrane filtration technique on R2A agar for heterotrophic bacteria, eosin blue methylene agar for coliforms, salty mannitol agar for Staphylococcus, cetrimide agar for Pseudomonas and Sabouraud agar with chloramphenicol for fungi. Results: Average results were for heterotrophic bacteria of 2.00 x 102 CFU / mL; Pseudomonas 7.00 x 10 CFU / mL, Staphylococcus 3.80 x 10 CFU / mL and fungi 1.40 x 10 CFU / mL. The presence of coliform bacteria was not detected. Discussion: The microbial groups present in low numbers are indicative of a characteristic microbiota adapted to the physicochemical conditions of this lake. It is concluded that it is a lake with a scarce microbial population, which would indicate a good microbiological quality.

Keywords : Quilotoa; Volcanic Lake; Quality; Microbiology.

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