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... low abundance of organisms is a notable feature in this lake, as the total density recorded was 70 org/m 2 where- as in others environments the density might vary from 350 to 95,000 org/m 2 ( Table 2). In general, the greater percentage of the density of the organisms is reported by the oligochaetes, which are used in freshwater environments as indicators of organic pollution (Wright, 1995;Carr and Hiltunen, 1965;Howmiller and Beeton, 1971;Slepukhina, 1984). ...

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... Se ha descripto que las larvas de Clinotanypus aparecen por lo general en sedimentos finos en la zona bentónica litoral de los embalses y en áreas de escasa corriente de arroyos y ríos, y que prefieren aguas cálidas (Cranston and Epler 2013). Procladius se reportó como abundante en lagos y embalses (Prat 1991;Hershey and Lamberti 2001;Juárez and Ibáñez 2003). En la familia Chironomidae se reconoce al género Chironomus como muy tolerante a la contaminación, con capacidad para soportar períodos de anoxia debido al componente de hemoglobina en sus tejidos, que le permite almacenar oxígeno. ...
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El Embalse Río Hondo es un ambiente muy poluído para el que los antecedentes de estudios biológicos aún son escasos. En este trabajo se caracteriza la diversidad de macroinvertebrados bentónicos y se aplica el índice multimétrico ICBRES, desarrollado para embalses. Se realizó un muestreo de macroinvertebrados, sedimentos y variables fisicoquímicas del agua en 6 sitios dentro del embalse. La temperatura media fue 19.3±2.2 °C, el pH fue 8±0.4, la conductividad eléctrica fue 656±13.3 µS/cm y el oxígeno disuelto fue 9.4±1.5 mg/L. La profundidad varió entre 1.3 y 16 m, y la transparencia osciló entre 0.25 y 0.70 m. En los sedimentos prevalecieron la arena fina, los limos y las arcillas. La densidad de organismos varió entre 0 y 23819±10312 individuos/m2. El 93.5% perteneció a Oligochaeta, el 4.1% a Chironomidae, el 2.2% a otros grupos bentónicos y el 0.2% a insectos no Chironomidae. La riqueza total fue 32 taxones y el índice de Shannon alcanzó un valor global de 1.63. Los oligoquetos más abundantes fueron Limnodrilus hoffmeisteri Claparède 1862 y Aulodrilus pigueti Kowalewski 1914. Entre los quironómidos, los más abundantes fueron Clinotanypus y Procladius. El índice aplicado clasificó la calidad del agua de buena a muy mala en los diferentes sitios. La baja diversidad y dominancia de organismos tolerantes reflejan las condiciones de contaminación y degradación ambiental del embalse. Se considera prometedor el potencial para desarrollar herramientas de biomonitoreo en base a macroinvertebrados bentónicos en el Embalse Río Hondo.
... Still, Chalco Lake's richness is close to that of lakes located around central Mexico, where richness ranges from 4 (Metztitlan Lake; Figure 4. Canonical correspondence analysis using the species that accounted for more than 5% of the individuals collected in the lake. Juárez & Ibáñez, 2003) to 22 families (Lake Tecocomulco, Hidalgo State), where Corixidae represented more than 50% of the individuals (Rico-Sánchez et al., 2014). A case of special interest, due to their proximity, are those located in the remainders of prehispanic Xochimilco Lake, which are only about 8 km and had never been drained. ...
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... Still, Chalco Lake's richness is close to that of lakes located around central Mexico, where richness ranges from 4 (Metztitlan Lake; Figure 4. Canonical correspondence analysis using the species that accounted for more than 5% of the individuals collected in the lake. Juárez & Ibáñez, 2003) to 22 families (Lake Tecocomulco, Hidalgo State), where Corixidae represented more than 50% of the individuals (Rico-Sánchez et al., 2014). A case of special interest, due to their proximity, are those located in the remainders of prehispanic Xochimilco Lake, which are only about 8 km and had never been drained. ...
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... Por lo antes mencionado se debe destacar la importancia de las técnicas de evaluación rápida para el monitoreo de la calidad del agua, y aún mas importante llevarlas a cabo en países en desarrollo como el nuestro (Chessman, 1995). Actualmente en México, los estudios sobre los componentes del bentos se han llevado a cabo en diversas localidades y cuerpos de agua, Juárez e Ibáñez (2003) realizaron un estudio sobre los macroinvertebrados bentónicos en el estado de Hidalgo, mencionando que se encontraron bajas densidades de quironómidos por diversas razones. Navarrete, et al. (2004) determinaron parámetros fisicoquímicos y reportaron 15 géneros de quironómidos en un bordo del Estado de México en la época de estiaje. ...
... Martínez (2008) reportó que los quironómidos fueron los organismos bentónicos, que presentaron la mayor incidencia en el bordo "Laguna Seca" con un total de 161 org/m 2, similar a lo obtenido en este bordo, con los mayores incrementos en enero y noviembre durante el estiaje; análogo a lo registrado en este cuerpo de agua. Juárez e Ibáñez (2003) reportaron que en el lago Metztitlán, Hidalgo, los quironómidos estuvieron ausentes durante la época de lluvias en el mes de septiembre, que fue donde se registró el mayor aporte de materia orgánica, además de que la mayor diversidad se registró en los meses de mayo y julio. ...
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