Identificación de la comunidad planctónica y determinación de índices de calidad del agua en las lagunas Chingaza, el medio y el Arnical del parque nacional natural Chingaza

Abstract

In this study was carried out the analysis and the identification of the planktonic communities and water quality for el Medio, el Arnical and Chingaza lagoons Located in the Chingaza paramo, this provides about 80 per cent of the water in Bogota. Despite its importance as a source of drinking water and its status as a protected site by the Ramsar Convention, no updated information regarding the status of these lagoons. There were 3 sampling in the months of September, January and March which correspond to dry, intermediate and humid season; in the wich were used plankton nets to collect a total of 168 samples to identify the community planktonic in each water body. Where was realized the determination of the genus and the number of present individuals in every sample, in these were found as genus with more individuals the Pinullaria. Measurements were done in- situ and water samples were taken to determine physical and chemical parameters and biological, in order to make the index of water quality NSF, the biological indixes of Shannon, Simpson, and Jaccard. In the analyzed samples were found low dissolved oxygen concentrations for each lagoon, a low concentration of dissolved ions and a small amount of nutrients. A statistical analysis was realized in order to determine the variations of the abundance and wealth in the lagoons and using an analysis of principal components was determined that the most influential variables in the ecosystem were dissolved oxygen, conductivity, pH, nitrates and phosphates.