caa a22 4500 467904553 CHVBK 20180406152830.0 cr unu---uuuuu 170328e20060301xx s 000 0 eng 10.1007/s10661-006-4941-5 doi (NATIONALLICENCE)springer-10.1007/s10661-006-4941-5 Evaluation of the Impact of Acid Mine Drainage on the Chemistry and the Macrobenthos in the Carolina Stream (San Luis - Argentina) [Elektronische Daten] [Susana Tripole, Patricia Gonzalez, Adriana Vallania, Marcela Garbagnati, Miguel Mallea] The purpose of this study was to evaluate the impact of acid mine drainage on the chemistry and the macrobenthos of the Carolina stream (San Luis - Argentina). Samples were obtained in the years 1997-1998 at two sites: site C1, located 200 m upstream of the drainage, and site C2, located 800 m downstream. The system buffer capacity was evaluated in the non - contaminated site by means of the buffer index calculation. The physico - chemical changes observed as a consequence of the contribution of acid mine drainage (AMD) were: a decreasing of pH and an increase in the ionic concentration, especially sulfate and Fe coming from the oxidation produced by chemiolithotrophic bacteria. The values obtained indicated a low buffer capacity and a high intrinsic vulnerability of the system to resist the impact originated by the AMD, producing a remarkable decreasing of pH of the receiving stream. These changes caused modifications in the original benthic community that was replaced by organisms more tolerant to the acid stress. A reduction in the abundance and in the taxonomic richness of the benthic macroinvertebrates was observed when compared with the reference station. An increase in the proportion of Chironomidae and of Acari and a decrease in the proportion of the remaining taxa were observed. The most sensitive groups were Ephemeroptera, Trichoptera and Mollusca. The community was mostly affected by the following variables: pH, conductivity, sulfate and dissolved total Fe. Springer Science + Business Media, Inc., 2006 acid mine drainage nationallicence acid stress nationallicence benthic macroinvertebrates nationallicence buffer capacity nationallicence intrinsic vulnerability nationallicence Tripole Susana Area Zoología, Universidad Nacional de San Luis, San Luis, Argentina aut Gonzalez Patricia Area de Química Analítica, Universidad Nacional de San Luis, San Luis, Argentina aut Vallania Adriana Area Zoología, Universidad Nacional de San Luis, San Luis, Argentina aut Garbagnati Marcela Area de Química Analítica, Universidad Nacional de San Luis, San Luis, Argentina aut Mallea Miguel Area de Química Analítica, Universidad Nacional de San Luis, San Luis, Argentina aut Environmental Monitoring and Assessment Springer Netherlands 114/1-3(2006-03-01), 377-389 0167-6369 114:1-3<377 2006 114 10661 https://doi.org/10.1007/s10661-006-4941-5 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10661-006-4941-5 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Tripole Susana Area Zoología, Universidad Nacional de San Luis, San Luis, Argentina aut NATIONALLICENCE 700 1- Gonzalez Patricia Area de Química Analítica, Universidad Nacional de San Luis, San Luis, Argentina aut NATIONALLICENCE 700 1- Vallania Adriana Area Zoología, Universidad Nacional de San Luis, San Luis, Argentina aut NATIONALLICENCE 700 1- Garbagnati Marcela Area de Química Analítica, Universidad Nacional de San Luis, San Luis, Argentina aut NATIONALLICENCE 700 1- Mallea Miguel Area de Química Analítica, Universidad Nacional de San Luis, San Luis, Argentina aut NATIONALLICENCE 773 0- Environmental Monitoring and Assessment Springer Netherlands 114/1-3(2006-03-01), 377-389 0167-6369 114:1-3<377 2006 114 10661 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer