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Aquatic insects and water quality in Penas Blancas watershed and reservoir. The aquatic insects have been used to evaluate water quality of aquatic environments.The population of aquatic insects and the water quality of the area were characterized according to the natural and human alterations present in the study site. During the monthly-survey, pH, DO, temperature, water level, DBO, PO 4 and NO 3 were measured. Biological indexes (abundance, species richness and the BMWP-CR) were used to evaluate the water quality. No relation between environmental and aquatic insects was detected. Temporal and spatial differences attributed to the flow events (temporal) and the presence of Penas Blancas reservoir (spatial). In the future, the investigations in Penas Blancas watershed need to be focused on determining the real influence of the flows, sediment release and the possible water quality degradation because of agriculture activities. Rev. Biol. Trop. 59 (2): 635-654. Epub 2011 June 01.

Insectos acuáticos y calidad del agua en la cuenca y embalse del río Peñas Blancas, Costa Rica