Water quality and fish community in the São José stream, São Carlos (SP): emphasis on the impacts caused by an abandoned waste dump
DOI:
https://doi.org/10.5902/2179460X13170Keywords:
Aquatic ecosystem, fish, trophic ecology, limnology, solid waste.Abstract
Human activities have been responsible for structural and functional changes in aquatic ecosystems, causing impacts in biological communities. The aim of this research was to analyze the ichthyofauna in the São José Stream, located next to an abandoned waste dump in São Carlos (SP), Brazil, and its trophic structure, looking for relationships among such features, the water physical and chemical characteristics and the land use patterns. Water and fish samples were taken at five sites during four sampling periods in 2007. Water temperature, pH, dissolved oxygen, electric conductivity and the concentrations of total and dissolved forms of phosphorus and nitrogen were measured at each sampling site. Poeciliidae and Characidae families were dominant, with 43.5% and 20.2% of the fish species collected, respectively. The sampling station located downstream the waste dump showed the highest conductivity values, the highest concentration of all nutrients and low dissolved oxygen concentrations. In addition, at this sampling station, fish species tolerant to pollution were abundant as well as species that were classified in iliophagous and detritivores. These results suggested that, even after more than 10 years of disabling the waste dump, the waste still represents a source of contamination to São José stream.Downloads
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