Bacterias nitrificantes cultivables de la zona limnética del lago de Tota, Boyacá

Abstract

Palabras clave: eutrofi zación; piscifactorías; lagos de agua dulce; microbiología acuática; bacterias del ciclo del N.Másmela-Mendoza, J.E.; Lizarazo-Forero, L.M.; Aranguren Riaño, N.J.: bacterias nitrificantes lago de Tota ABSTRACT Fish production activities in Lake Tota, Boyacá are increasing concentrations of ammonium and nitrate, nutrients that are accelerating eutrophication processes. Some of the microbial communities that regulate the entry of allochthonous nitrogen are nitrifying bacteria, and the determination of their abundance in ecosystems is a measure of pollution bioindication. The objective of the study was to quantify and biochemically characterize the cultivable nitrifying bacteria of the limnetic zone of Lake Tota. The most probable number technique (MPN) was used to measure abundance. The samples were taken in the Lago Chico and Lago Grande sectors, in limnetic areas with fish activity and without intervention. Physical and chemical variables were measured in situ and the concentration of nutrients in the laboratory was determined. The highest quantifications of nitrifying bacteria were recorded in the area of influence of fish farming. The group of ammonium oxidizing bacteria (BOA) and nitrite oxidants (BON) was smaller in the central area of Lago Grande compared to fish farms in Hato Laguna and El Túnel. 14 isolates of nitrifying bacteria were obtained, genera Nitrosomonas spp. and Nitrobacter spp. Changes in BOA abundance were related to alkalinity, while BON values correlated with electrical conductivity and dissolved inorganic nitrogen. A greater abundance of nitrifying bacteria was recorded in the lake's limnetic areas affected by fish farming activity, associated with the increase in nutrients dissolved in the water column.

Wastewater treatment from a science faculty during the COVID-19 pandemic by using ammonium-oxidising and heterotrophic bacteria

“…At pH 7.0 ± 0.2, the NH 4 + is available in its ionic form, favouring the interaction of the substrate and the catalytic centre of Ammonia Monooxygenase (E.C. 1.14.99.39), (Stein et al 1997 ; Bao et al 2017 ; Huang et al 2017 ; Antileo et al 2022 ); at this pH close to the optimal one for AOB, higher amounts of cells recovered from non-saline surface waters could be produced (French et al 2012 ; Másmela-Mendoza et al 2019 ).…”

Efecto de cultivos piscícolas en los sedimentos y la proliferación de comunidades bacterianas nitrificantes en el lago Guamuez, Colombia

“…Cantidad de UFC de bacterias nitrificantes en sedimentos del lago Guamuez (promedio ± desviación estándar) Fuente: Elaboración propia Por ser un lago oligotrófico, el Guamuez presenta niveles óptimos de oxígeno mayores de 7 mg/L, con una temperatura promedio de 13 °C y un porcentaje de saturación de 140,24, condiciones favorables que permiten el desarrollo de bacterias nitrificantes. Másmela-Mendoza et al (2019) informaron que los lagos de alta montaña presentan mayor cantidad de bacterias nitrificantes respecto a otros ecosistemas Cienc. Tecnol.…”