Journal of Shanghai University(Natural Science Edition) ›› 2013, Vol. 19 ›› Issue (4): 345-353.doi: 10.3969/j.issn.1007-2861.2013.04.004

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Response and Bioaccumulation of Lead by Benthic Invertebrate Chironomus Larvae from a Heavily Polluted Urban River

LIANG Xia, ZHANG Xiu-yun, HE Chi-quan, LIU Jia-miao   

  1. (School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, China)
  • Online:2013-08-27 Published:2013-08-27

Abstract: Chironomus larvae, an especially abundant benthic invertebrate assemblage in heavily polluted
urban rivers in Shanghai was collected from the water body and exposed to water and sediments that artificially enriched with a range of lead (Pb) concentrations. The Chironomus larvae showed a strong ability to tolerant Pb2+ toxicity so that the acute toxicity values was 48 h LC50 3.8 g/L. Bioaccumulation of Pb2+ by the Chironomus larvae increased with the increasing concentration of Pb2+.The maximum bioaccumulation observed in this study was 3.76 mg/g larva, occurring under water Pb2+ concentration of 100 mg/L. Toxicological response of Pb2+ for Chironomus larvae was evaluated by two biomarkers, the metalloenzymes linked superoxide dismutase (SOD) and the metallothionein (MT). Both biomarkers reached peak values with the exposure time, except for the drastic fluctuation in SOD activity at 500 mg/kg sediments Pb2+ concentration. The food chain transfer of Pb2+ from the Chironomus larvae to freshwater farmed fish. Crucian carp (Carassius Carassius L) was investigated by feeding carps with lead-contaminated Chironomus larvae. The concentrations of tissue Pb in carp were significantly elevated above the control levels after Chironomus feeding 9 days. This study helps understand the Chironomus larva toxicological response and bioaccumulation for metal Pb(Ⅱ).

Key words: Chironomus larvae, lead (Pb) pollution, lead accumulation, metallothionein(MT), superoxide dismutase (SOD)

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