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• W1900558306 abstract "Amphibians, particularly larval stages, are strongly sensitive to pollutants, so they have become useful indicators to assess how different human activities affect ecosystems. In this way, tadpoles were used as bioindicators in the Medio Dagua zone, in Zaragoza town, where mining has released pollutants into the Dagua River (mostly heavy metals). Using spectrophotometry by cold vapor atomic absorption, we measured total mercury concentrations in tadpoles of five species, with a sediment sample for each animal sample as an environment reference. The study was realized in two areas with different intervention levels, we report mercury concentration ranges from 0.07 to 0.24 μg/g for high impact zone and from 0.07 to 0.17μg/g for unknown impact zone, these levels do not exceed set limits used by local environmental authorities, however, is evident that bioaccumulation processes are developing in the area because organisms concentrations were always higher than those of the environment, in fact, significantly different (MW Utest, p = 0.001) therefore we propose the implementation of biomonitoring and bioremediation programs in the area, taking in consideration that tadpoles species used here, were mainly first order consumers, and when their mercury concentrations are incorporated into the food chain, these contaminant loads will produce biomagnification processes. Bioacumulacion de mercurio en larvas de anuros en la zona afectada por la mineria de oro en el Rio Dagua, Buenaventura, Valle del Cauca. Los anfibios, particularmente en sus estados larvales, tienen una gran sensibilidad  a la concentracion de contaminantes; por lo que se han convertido en una herramienta indicadora para evaluar como las diferentes actividades humanas afectan  los ecosistemas acuaticos. Debido a esto se utilizaron larvas de anuros como bioindicadores en la zona del medio Dagua, en Zaragoza, donde la actividad minera, ha liberado contaminantes al rio Dagua (Metales pesados principalmente). Utilizando la tecnica de Espectrofotometria por Absorcion Atomica de Vapor Frio se midieron las concentraciones de mercurio total en renacuajos de cinco especies, junto con una muestra de sedimentos para cada muestra animal, como un referente ambiental. La evaluacion se realizo en dos zonas con diferente grado de intervencion y se reportan rangos de concentracion de mercurio que van desde 0.07 hasta 0.24 µg/g y desde 0.07 hasta 0.17 µg/g para la zona de alto impacto y de impacto desconocido respectivamente, pese a que los niveles no superan limites establecidos las autoridades ambientales, es evidente que en la zona se desarrollan procesos de bioacumulacion, ya que las concentraciones en los organismos siempre fueron mayores a las del ambiente, de hecho significativamente diferentes (M-W Utest, p= 0,001), por lo que se propone la implementacion de programas de biomonitoreo y bioremediacion en la zona, teniendo en cuenta  que los renacuajos son principalmente consumidores de primer orden y al incorporarse en la cadena trofica las cargas contaminantes entrarian en procesos de biomagnificacion." @default.
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• W1900558306 date "2013-05-01" @default.
• W1900558306 modified "2023-09-28" @default.
• W1900558306 title "Mercury Bioaccumulation on Tadpoles of a Gold Mining Zone in Dagua River, Buenaventura, Valle del Cauca, Colombia" @default.
• W1900558306 hasPublicationYear "2013" @default.
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