Can a one-sampling campaign produce robust results for water quality monitoring? A case of study in Itupararanga reservoir, SP, Brazil

Abstract

Aim: The aim of this study was to conduct a rapid and comprehensive analysis of the reservoir using physical, chemical and biological variables comprising water and sediment as also to verify if a one-sampling campaign can produce information that is robust enough for monitoring purposes. Methods One-sampling campaign was performed along the central body of Itupararanga reservoir comprising five sampling points. The following physico-chemical and biological variables were measured in each of them from water samples: temperature, pH, concentration of dissolved oxygen, electric conductivity, suspended matter, total nitrogen and phosphorus and fecal coliforms. A genotoxicity assay with Allium cepa was also performed with water from each one of the five sampling points. As a complement, the phytoplankton and benthic macroinvertebrates communities were also analyzed in the two most distant sampling points (P1 and P5). Results Results indicate a scenario with eutrophication and toxicity. High concentrations of fecal coliforms were recorded and there is a worrying prevalence of cyanobacteria - potential toxin producers - in phytoplankton community. Benthic macroinvertebrates analysis suggests poor quality of the water and sediments. Genotoxicity tests suggest the presence of toxic substances along the waterbody. Conclusions It is concluded that Itupararanga reservoir has water with poor quality that could be related to the land uses around the reservoir. The comprehensive approach performed here - where distinct sources of monitoring variables was considered - despite the rapid protocol (one campaign), was enough to respond to the distinct anthropic impacts received by the reservoir. Considering it, this approach is recommended as a rapid diagnostic tool.

Self‐Organizing Maps for Evaluation of Biogeochemical Processes and Temporal Variations in Water Quality of Subtropical Reservoirs

“…Previous studies showed that the Itupararanga Reservoir faced a progressive deterioration in water quality in the last two decades (Beghelli, Pompêo, et al, 2016;Taniwaki et al, 2013). Based on the TSI, the reservoir was classified as oligotrophic in 2007, mesotrophic in 2008, supereutrophic in 2011, and eutrophic in 2018(Frascareli et al, 2018Rosa et al, 2015;Taniwaki et al, 2011).…”

The Effects of Sediment Classification Pattern on a Water Column Organism, Ceriodaphnia dubia

“…At sampling sites very similar to those in this study, Taniwaki et al (2013) performed genotoxicity analyses in 2010 and showed that there was an increase in the index of chromosomal alterations when compared to the negative controlin all seasons, with the point in the center of the system (P4) presenting the highest index. A study by Beghelli et al (2016) that evaluated the community of benthic macroinvertebrates identified species that were bioindicators of organic enrichment and tolerant to pollution.…”