Abstract

MOSQUERA MURILLO, Zuleyma  and  MOSQUERA MOSQUERA, Mayrin Minerva. DIVERSITY OF AQUATIC ENTOMOFAUNA AND WATER QUALITY IN STREAMS OF SAN JUAN RIVER, CHOCÓ - COLOMBIA. rev.udcaactual.divulg.cient. [online]. 2017, vol.20, n.1, pp.149-161. ISSN 0123-4226.

Despite its outstanding importance, the aquatic ecosystems of the Chocó region are suffering great impacts caused by human activities, including mining; being the one of the main economic activities of the region. In this sense and considering the value of aquatic insects as bio indicators of water quality, the objective of this study was to evaluate the diversity of aquatic entomofauna and water quality in streams of the San Juan River (Chocó-Colombia). For this purpose, aquatic insects were collected between May and August 2015 in multiple habitats (stones, leaf litter and riparian vegetation) of five streams of the studied basin. In addition, some physicochemical variables of water were measured and BMWP/Col and ASPT indices were evaluated for water quality. 4119 individuals were collected, corresponding to nine orders, 37 families and 59 genera. Ephemeroptera was the most abundant of the orders (34.32%), and the highest taxonomic richness (13 genera). With regard to diversity, almost all the streams studied correspond to high diversity, except Guapandó, but no significant differences (p> 0.05) were presented and Raspadurita was the one that presented the greatest taxonomic richness with 76.56% of the genera recorded in the study. Similarity values indicate that the streams exhibit high variability in their communities. BMWP/Col index values classified streams as very clean with good quality, while the ASPT index classifies as slightly contaminated with acceptable quality.

Keywords : Aquatic insects; bioindication; water sources.

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