EFFECTS OF LAND USE ON THE COMMUNITY OF BENTHIC MACROINVERTEBRATES IN STREAMS OF THE IQUIRI RIVER BASIN (ACRE, BRAZIL)
Keywords:
Grassland, Impact, Aquatic system, EPT, CompositionAbstract
The present work aimed to verify whether the change in land use affects the composition and community attributes of benthic macroinvertebrates in small streams in eastern Acre State. The research was developed in streams of the Iquiri River, which belongs to the Acre river watershed, region of Baixo Acre in the municipality of Capixaba (AC). Fourteen streams, all tributaries of the Iquiri River, were selected and grouped in three types of land use: forest (continuous forest), pasture and sugarcane planting. Hydrogen ionic potential (pH), electrical conductivity (µS.cm-1), water temperature (ºC), dissolved oxygen (ml.L-1) and water resistance (Ωm) were determined. In order to analyze possible differences in physicochemical values among the three environments, it was used the Variance Analysis (ANOVA) measure with value significance of 5%. In our study, a strong reduction was observed in the %collectors in streams with presence of pasture, possibly as a consequence of the reduction of fine organic matter, lower in areas where riparian vegetation is reduced or absent.
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