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(W/FF225) Behavioral responses and survival to short-term Cr6+-pollution in Chironomus and tadpole from Rio Rocha, Bolivia. Janssens de Bisthoven, Luc 1, Gerhardt, Almut1, Aguliera Salvatierra, X.2, Brun Torrico, M.2, Castellon Reynaga, D.2, Coronel Patino, J.2, Goitia Arze, E.L.2, Maldonado, M.2, Zapata Paniagua, M.2, 1 2 ABSTRACT- The Rio Rocha is a degraded river situated in the valley of Cochabamba at ca. 2000 m altitude, in Bolivia. It is polluted by urban sewage, detergents and small industries, e.g. a leather factory with periodic discharge of chromium. The local fauna upstream and in the town is polysaprobic. Chironomus and a tadpole from the stream were tested in the laboratory at different concentrations of Cr6+ (0.1, 1, 5, 10 ppm) for survival and behavioral responses after 24 h and 48 h, measured with the Multispecies Freshwater Biomonitor (MFB), combined with screening of mouth part deformities in Chironomus. It is discussed why mortality and deformities remained at control levels. Key words: Chironomus, chromium-toxicity, tadpole, multispecies freshwater biomonitor |
