Multimetric analyses for assessing pollution in the Lerma river and Chapala lake, Mexico

摘要: Techniques for monitoring the water quality should have low costs and consider several parameters in order to obtain more efficient analysis of data. This study proposes an application a multimetric system bioassessment contamination during dry (May), rainy (July) post-rainy conditions (November) main stream LermaChapala basin. It included seven physiochemical determinations Water Quality Index (WQI), Extended Biotic (EBI) based on macrobenthos communities bioassays sorghum seeds. The results indicated that according levels WQI there was big difference between river lake; season, figures scale polluted highly polluted, including its entrance Chapala Lake, rest lake placed within interval pollution acceptable. In periods, improved found range not very mean time entire