Denitrifying bacteria in the limnetic zone of Lake Tota, Colombia

The objective of study was to isolate and determine the identity of denitrifying bacteria from limnetic areas of Lake Tota (Colombian Andes) with and without rainbow trout production activities. We examined the relationships between the lake’s physicochemical factors (oxygen, nitrogen, and phosph...

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Autor principal:	Julián Esteban Másmela-Mendoza, Luz Marina Lizarazo-Forero
Formato:	article
Lenguaje:	EN ES
Publicado:	Pontificia Universidad Javeriana 2020
Materias:	denitrifying bacteria; eutrophication; fish farms; freshwater lakes; water pollution. Science (General) Q1-390
Acceso en línea:	https://doaj.org/article/b180bffd1e4d46fb836f2f6fd402de40
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spelling	oai:doaj.org-article:b180bffd1e4d46fb836f2f6fd402de402021-11-17T15:40:53ZDenitrifying bacteria in the limnetic zone of Lake Tota, Colombia10.11144/Javeriana.SC26-1.dbit0122-74832027-1352https://doaj.org/article/b180bffd1e4d46fb836f2f6fd402de402020-03-01T00:00:00Zhttps://revistas.javeriana.edu.co/index.php/scientarium/article/view/28497https://doaj.org/toc/0122-7483https://doaj.org/toc/2027-1352The objective of study was to isolate and determine the identity of denitrifying bacteria from limnetic areas of Lake Tota (Colombian Andes) with and without rainbow trout production activities. We examined the relationships between the lake’s physicochemical factors (oxygen, nitrogen, and phosphorus content) and two bacterial communities (denitrifying bacteria and coliforms). Water samples were taken 20 m below the surface from July to September at five limnetic zones; two of which were close to rainbow trout farming areas. In each zone, the concentrations of oxygen, nitrogen, and phosphorus were measured. To identify and quantify the abundance of bacteria, the most probable number (MPN) technique was used, employing minimal medium for denitrifying bacteria and medium for nitrate reducing bacteria (NRB). A greater number of denitrifying bacteria were found in the fish farming zones, identifying bacteria of the genera Bacillus, Pseudomonas, Nocardia, and Streptomyces. The number of nitrate-reducing bacteria revealed statistically significant differences throughout the sampling period, increasing from July to September and was related to a decrease in precipitation. The density of NRB and total phosphorus were directly correlated. High bacterial densities of denitrifying bacteria and coliforms are indicative of changes from oligotrophic to eutrophic states in the studied limnetic areas. Julián Esteban Másmela-Mendoza, Luz Marina Lizarazo-ForeroPontificia Universidad Javerianaarticledenitrifying bacteria; eutrophication; fish farms; freshwater lakes; water pollution.Science (General)Q1-390ENESUniversitas Scientiarum, Vol 26, Iss 1, Pp 1-16 (2020)
institution	DOAJ
collection	DOAJ
language	EN ES
topic	denitrifying bacteria; eutrophication; fish farms; freshwater lakes; water pollution. Science (General) Q1-390
spellingShingle	denitrifying bacteria; eutrophication; fish farms; freshwater lakes; water pollution. Science (General) Q1-390 Julián Esteban Másmela-Mendoza, Luz Marina Lizarazo-Forero Denitrifying bacteria in the limnetic zone of Lake Tota, Colombia
description	The objective of study was to isolate and determine the identity of denitrifying bacteria from limnetic areas of Lake Tota (Colombian Andes) with and without rainbow trout production activities. We examined the relationships between the lake’s physicochemical factors (oxygen, nitrogen, and phosphorus content) and two bacterial communities (denitrifying bacteria and coliforms). Water samples were taken 20 m below the surface from July to September at five limnetic zones; two of which were close to rainbow trout farming areas. In each zone, the concentrations of oxygen, nitrogen, and phosphorus were measured. To identify and quantify the abundance of bacteria, the most probable number (MPN) technique was used, employing minimal medium for denitrifying bacteria and medium for nitrate reducing bacteria (NRB). A greater number of denitrifying bacteria were found in the fish farming zones, identifying bacteria of the genera Bacillus, Pseudomonas, Nocardia, and Streptomyces. The number of nitrate-reducing bacteria revealed statistically significant differences throughout the sampling period, increasing from July to September and was related to a decrease in precipitation. The density of NRB and total phosphorus were directly correlated. High bacterial densities of denitrifying bacteria and coliforms are indicative of changes from oligotrophic to eutrophic states in the studied limnetic areas.
format	article
author	Julián Esteban Másmela-Mendoza, Luz Marina Lizarazo-Forero
author_facet	Julián Esteban Másmela-Mendoza, Luz Marina Lizarazo-Forero
author_sort	Julián Esteban Másmela-Mendoza, Luz Marina Lizarazo-Forero
title	Denitrifying bacteria in the limnetic zone of Lake Tota, Colombia
title_short	Denitrifying bacteria in the limnetic zone of Lake Tota, Colombia
title_full	Denitrifying bacteria in the limnetic zone of Lake Tota, Colombia
title_fullStr	Denitrifying bacteria in the limnetic zone of Lake Tota, Colombia
title_full_unstemmed	Denitrifying bacteria in the limnetic zone of Lake Tota, Colombia
title_sort	denitrifying bacteria in the limnetic zone of lake tota, colombia
publisher	Pontificia Universidad Javeriana
publishDate	2020
url	https://doaj.org/article/b180bffd1e4d46fb836f2f6fd402de40
work_keys_str_mv	AT julianestebanmasmelamendozaluzmarinalizarazoforero denitrifyingbacteriainthelimneticzoneoflaketotacolombia
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Denitrifying bacteria in the limnetic zone of Lake Tota, Colombia

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