카드뮴과 아연 노출에 따른 야외종 장수깔따구 (Chironomus plumosus)의 생태독성학적 반응 = Ecotoxicological Response of Cd and Zn Exposure to a Field Dominant Species, Chironomus plumosus

다국어 초록 (Multilingual Abstract)

Heavy metal contamination in freshwater ecosystem has been receiving increased worldwide attention due to their direct or indirect effect on human health and aquatic organisms. In this study, we investigated biological effects such as survival rate, growth rate, emergence rate, sex ratio and mouthpart deformity of Chironomus plumosus. The survival rate of C. plumosus decreased with the increase in heavy metal concentration as well as exposure time after cadmium (Cd) or zinc (Zn) exposure. The growth rate decreased at days 4 and 7 after Cd exposure and significantly reduced at the relatively high concentration of 50 mg L-1 Cd. The emergence rate was decreased at 50 mg L-1 Cd and 100 mg L-1 Zn. The sex ratio showed imbalance pattern at relatively low concentrations (0.5 and 2 mg L-1 Cd) with high proportion of male and relatively high concentration (100 mg L-1 Zn) with high proportion of female (60%). In addition, mentum deformities were observed at high concentration of Cd and Zn. These results suggest that heavy metal exposure in aquatic ecosystem may affect biological and morphological responses, and aquatic midge C. plumosus is a potential indicator for assessment of environmental pollutant such as heavy metals.

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