Abstract

MANCILLA-VILLA, Oscar Raúl et al. Organic contamination by coliforms, Nitrogen and Phosphorus in the acuatic ecosistems of the Ayuquila-Armeria basin, Jalisco, Mexico. Biotecnia [online]. 2022, vol.24, n.1, pp.5-14.  Epub June 13, 2022. ISSN 1665-1456.  https://doi.org/10.18633/biotecnia.v24i1.1283.

The Ayuquila-Armería river basin is within the priority basins classification in Mexico, given its high diversity, and due to its high degree of functional dynamics alteration and levels of social pressure it presents; therefore, it is necessary to carry out an analysis of water quality within the basin. The objective was to evaluate organic contamination, carrying sampling campaigns in two seasons, one in the rainy (2015) and the other in the dry (2016) season, at 18 sites in the basin, through the implementation of a comprehensive analysis of physicochemical and biological variables. According to PTotal concentrations, 90% of the sites presented eutrophication, exceeding 77% of them the permissible limit for NTotal concentrations. The IIB showed that 19% of the sites present a high degree of organic contamination, with highest CFU concentrations (18 to 190 CFU / mL) found in the rainy season and 50% of the sites exceeding the permissible limit (10 CFU / mL). The influence of tributary influents to the main channel increases drastically in the rainy season, increasing flows and impoverishes the surface water quality by pollutants carryover from rural and urban areas.

Keywords : nutrients; pollution; macroinvertebrates; coliforms; biotic integrity index.

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