Abstract

VELASCO, Sandra Morales; SALAZAR SANCHEZ, Margarita del Rosario  and  URREA LEDESMA, José Dulis. Macroinvertebrate and Periphyton Community Composition and Structure of the Ejido River, Popayan - Cauca. rev. cienc. [online]. 2016, vol.20, n.2, pp.11-25. ISSN 0121-1935.  https://doi.org/10.25100/rc.v20i2.4670.

The Ejido River is an ecosystem of ecological and social importance which flows through much of the city of Popayán becoming an environmental axis, but human activities have led to a deterioration of this ecosystem. In order to establish indicators for this water resource, the aquatic community was evaluated (Macroinvertebrates and periphyton), performing sampling (4) in four points distributed over the urban area of the city, where there were variations of the physico-chemical characteristics of water in relation to the biota present. According to the score awarded by the BMWP, 4 sampling points are classified in class V (≤ 15) as being heavily polluted waters. 18 genera of algae were identified, the most frequent were: Anabaena, Chlamydomona, Euglenophyta, Oscillatoria, Trachelomona, Merismopedia and Tabellaria, which is an indicator of eutrophication and high content of organic matter; a condition due to dumping from the life stock slaughter center and the lack of a sewerage system.

Keywords : Bioindicators; Quality of water; Biomonitoring.

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