Biological Evaluation of the Water Quality of the Cajamarquino River through the BMWP and EPT Indices of Benthic Macroinvertebrates

Atoche Bazán L.D. · Proceedings of the LACCEI international Multi-conference for Engineering, Education and Technology (2025) · DOI: 10.18687/laccei2025.1.1.1580

Resumen

This study assesses the relationship between water quality and the BMWP/Col and EPT indices of benthic macroinvertebrates in the Cajamarquino River to evaluate its ecological condition. Physicochemical parameters—pH, conductivity, temperature, dissolved oxygen, total dissolved solids, and salinity—were analyzed alongside macroinvertebrate identification, using the BMWP/Col, EPT, Shannon, and Simpson indices. Hydromorphological and riparian characteristics were assessed with IHF and QBR indices, supported by plant species records from sampling sites during both dry and rainy seasons. Results showed pH values between 8.3 and 9.46, a maximum conductivity of 760 µS/cm, average salinity of 0.18+++, and a mean temperature of 18.4°C. The IHF and QBR indicated an intermediate riparian habitat, with river conditions ranging from “with limitations” to “adequate.” However, the biotic indices revealed poor water quality, with pollution levels from critical to very critical. The findings highlight a strong link between physicochemical parameters and macroinvertebrate community structure, demonstrating that despite acceptable habitat conditions, biological indicators signal ecological degradation. These results provide essential information for understanding the river's ecological integrity and its ability to support aquatic life.

Instituciones: Universidad Privada del Norte