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Microbiological contamination of Araucanian and North Patagonian lakes. 10th Region. Chile

García-Quintana, H.G.; Leiva, S.

Revista Latinoamericana de Microbiologia 41(3): 127-132

1999

ISSN/ISBN: 0187-4640
PMID: 10979836
Document Number: 508082
The microbiological distribution in two lakes from the Xth Region of Chile is studied. In the Lake Ranco (Araucanian), the viable counts were high and ranged from 20 to 1050 CFU/ml. The numbers of total coliforms were high, with densities between 9 and 842 CFU/100 ml. The predominant bacterial flora in the water were Enterobacteriaceae (34.0%). In the sediment the bacterial densities were always higher. Sulphate-reducing bacteria were detected in the sediments. The Lake Yelcho (Nordpatagonic), presented a very high count in relation with its oligotrophic state. In some places there were fecal coliforms. The predominant bacterial flora in the water samples corresponded to Flavobacterium-Flexibacter (26.4%) and Pseudomonas (22.0%). In the sediment the higher viable counts and total coliforms were obtained in sites adjacent to a salmon farm; the MPN of sulphate-reducing bacteria was 29500 bacteria/100g.

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