河川の微量元素汚染指標生物としての水生昆虫ヒゲナガカワトビゲラに関する研究 : 実験室における水からの微量元素の蓄積

概要

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The 5th instar larvae of an aquatic insect, caddisfly Stenopsyche marmorata were exposed for 5 days to one of 11 trace elements (Be, Ag, Cd, Hg, Cr, Co, Ni, Cu, Pb, Mn and Zn) at 5 concentrations, either of which corresponds to a level, ten to one thousand times higer than the level of non-contaminated rivers in our country.The concentrations of trace elment in the larvae exposed to either of those elements incresed as the exposure concentration rose. The bioaccumulation of Hg or Cd was markedly high (100 times higher than the control level at exposure concentration of 0.01mg·1-1), whereas it was comparatively low for Mn or Zn (less than 2 times higher than the control level at 1 mg·l-1). The ratio of concentration of Hg or Cd in the larvae to its exposure concentration exceeded one hundred at any exposure concentration.These results suggest that the caddisfly larva is useful as an effective bio-monitor for detection of low level contamination of trace elements in rivers.
社団法人　日本水環境学会の論文
1995-11-10