Biological Evaluation of the Water Quality of the Cajamarquino River through the BMWP and EPT Indices of Benthic Macroinvertebrates (#1580)

Authors

Atoche Bazán, Leslie Dayana

Abstract

This research aimed to determine the relationship between water quality and the BMWP/Col and EPT indices of benthic macroinvertebrates in the Cajamarquino River. The study assessed key physicochemical parameters such as pH, electrical conductivity, temperature, dissolved oxygen, total dissolved solids (TDS), and salinity, alongside the identification of benthic macroinvertebrates. Biotic indices (BMWP/Col and EPT) and diversity indices (Shannon and Simpson) were applied. Additionally, hydromorphological and riparian vegetation characteristics were evaluated using the IHF and QBR indices, complemented by a plant inventory from sampling stations. The research followed an experimental design with two sampling campaigns: one in the dry season and another in the rainy season. Results showed pH values between 8.3 and 9.46, with a maximum conductivity of 760 µS/cm. The mean salinity was 0.18‰, and the average temperature was 18.4°C. The riparian quality indices (IHF and QBR) indicated intermediate habitat quality, with conditions ranging from “with limitations” to “adequate.” Regarding biotic indices, EPT and BMWP/Col results revealed poor water quality, with pollution levels ranging from critical to very critical. These findings highlight a close relationship between physicochemical parameters, benthic macroinvertebrate composition, biotic and diversity indices, and water quality. Ultimately, this study enhances the understanding of the ecological status of the Cajamarquino River.