Applying a multimetric index based on benthic macroinvertebrates in a reservoir in the north of Argentina
DOI:
https://doi.org/10.25260/EA.24.34.1.0.2258Keywords:
bioindicators, chironomids, oligochaetes, ICBRES, Sali-Dulce basinAbstract
The Río Hondo reservoir is a highly polluted environment, for which biological studies are still scarce. In this work, the diversity of benthic macroinvertebrates was characterised and the multimetric ICBRES index developed for reservoirs has been applied. Macroinvertebrate, sediment and water physicochemical variables were sampled at 6 sites in the reservoir. The mean temperature was 19.3±2.2 °C, pH was 8±0.4, electrical conductivity was 656±13.3 µS/cm and the dissolved oxygen was 9.4±1.5 mg/L. The depth ranged between 1.3 and 16 m, and transparency oscillated between 0.25 and 0.70 m. Fine sand, silt and clay prevailed in sediments. Density of organisms ranged from 0 to 23819±10312 individuals/m2. Oligochaeta represented 93.5%, 4.1% for Chironomidae, 2.2% for other benthic groups and 0.2% for non-Chironomidae insects. Total richness was 32 taxa, and the Shannon index reached a global value of 1.63. The most abundant oligochaetes were Limnodrilus hoffmeisteri Claparède 1862 and Aulodrilus pigueti Kowalewski 1914. Among chironomids, the most abundant were Clinotanypus and Procladius. The applied index ranked the water quality from good to very poor at the different sites. The low diversity and dominance of tolerant organisms reflected reservoir pollution and environmental degradation. The potential to develop biomonitoring tools based on benthic macroinvertebrates in the Río Hondo reservoir appears promising.
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