Abstract
This study aimed to evaluate the water quality in the Tigreiro river, Jacui river Basin, using different approaches. Benthic macroinvertebrates were sampled in July 2010 (winter) and February 2011 (summer) at five sites. In this study were analyzed: microbiological, physical and chemical variables, benthic macroinvertebrates richness and diversity, rapid ecological assessment protocol and benthic biotic indices (% EPT, BMWP’-IAP, ASPT, SOMI). A total of 5,852 individuals were collected belonging to 31 taxa of three Phyla: Annelida, Mollusca and Arthropoda. Chironomidae was the most abundant taxon (63.70%). A reduction in richness, diversity H’ and evenness J’ was observed from the initial stretches to the end stretches of Tigreiro river. The use of different approaches showed that sites in the rural area were less altered. The Tigreiro river was strongly impacted, mainly due to discharge of domestic effluents in the urban area, and the combination of different metrics was useful to detect impacted sites and the consequence for the water quality.
Highlights
The urbanization and expansion of cities have progressively resulted in deteriorating freshwater conditions
The Tigreiro river was strongly impacted, mainly due to discharge of domestic effluents in the urban area, and the combination of different metrics was useful to detect impacted sites and the consequence for the water quality
The sites contained a larger number of individuals from a sole family (Chironomidae), which was reflected in the lowest evenness index for all the sites (Figure 2), lowest final evaluation of benthic biotic indices (Table 2) and worst microbiological, physical and chemical variables (Table 3)
Summary
The urbanization and expansion of cities have progressively resulted in deteriorating freshwater conditions. Urban watersheds have been studied to assess multiple environmental impacts in these surrounding areas (MORENO; CALLISTO, 2006). Multiple human impacts include artificial eutrophication, siltation, homogenization of the river channel, construction of dams, removal of riparian vegetation and introduction of alien species (CAMARGO et al, 2004; HALL et al, 2006). The importance of rivers as a source of drinking water, recreation and food is well recognized, on the other hand, is growing the degradation of aquatic ecosystems
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