Phototactic behavior of Daphnia carinata as an indicator of chromium biotoxicity

Abstract

Abstract: The study on the phototactic behavior of Daphnia carinata clone Dc42 as an indicator of chromium biotoxicity showed that the phototaxis inhibition ratio (Rpi) of D.carinata could better indicate the chromium status in water.There was a negative linear correlation between phototactic index (I_p) and Cr⁶⁺ concentration in standardized K₂Cr₂O₇ solutions (R²=0.8089,P<0.001).The detection limit of Cr⁶⁺ by I_p was 0.056 mg稬^-1,much lower than that of LC₅₀ or EC₅₀,and the mean precision index for detection reached up to 5.46%,which suggested the sensitivity,precision and reliability of this method in monitoring chemicals biotoxicity.

Key words: Chromium, Daphnia carinata, Phototactic behavior, Biomonitor

CLC Number:

Q948.3

WU Yonggui, HUANG Jianguo, YUAN Ling . Phototactic behavior of Daphnia carinata as an indicator of chromium biotoxicity [J]. Chinese Journal of Applied Ecology, 2005, 16(1): 171-174.

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