Shuhaimi-Othman M, Nur-Amalina R, Nadzifah Y
School of Environmental and Natural Resource Sciences, Faculty of Science and Technology, National University of Malaysia-UKM, Selangor, 43600 Bangi, Malaysia.
ScientificWorldJournal. 2012;2012:125785. doi: 10.1100/2012/125785. Epub 2012 Apr 24.
Adult freshwater snails Melanoides tuberculata (Gastropod, Thiaridae) were exposed for a four-day period in laboratory conditions to a range of copper (Cu), cadmium (Cd), zinc (Zn), lead (Pb), nickel (Ni), iron (Fe), aluminium (Al), and manganese (Mn) concentrations. Mortality was assessed and median lethal times (LT₅₀) and concentrations (LC₅₀) were calculated. LT₅₀ and LC₅₀ increased with the decrease in mean exposure concentrations and times, respectively, for all metals. The LC(50) values for the 96-hour exposures to Cu, Cd, Zn, Pb, Ni, Fe, Al, and Mn were 0.14, 1.49, 3.90, 6.82, 8.46, 8.49, 68.23, and 45.59 mg L⁻¹, respectively. Cu was the most toxic metal to M. tuberculata, followed by Cd, Zn, Pb, Ni, Fe, Mn, and Al (Cu > Cd > Zn > Pb > Ni > Fe > Mn > Al). Metals bioconcentration in M. tuberculata increases with exposure to increasing concentrations and Cu has the highest accumulation (concentration factor) in the soft tissues. A comparison of LC₅₀ values for metals for this species with those for other freshwater gastropods reveals that M. tuberculata is equally sensitive to metals.
在实验室条件下，将成年淡水螺类瘤拟黑螺（腹足纲，蜒螺科）暴露于一系列不同浓度的铜（Cu）、镉（Cd）、锌（Zn）、铅（Pb）、镍（Ni）、铁（Fe）、铝（Al）和锰（Mn）环境中，为期四天。评估死亡率并计算半数致死时间（LT₅₀）和半数致死浓度（LC₅₀）。对于所有金属，LT₅₀和LC₅₀分别随着平均暴露浓度和时间的降低而增加。96小时暴露于Cu、Cd、Zn、Pb、Ni、Fe、Al和Mn的LC₅₀值分别为0.14、1.49、3.90、6.82、8.46、8.49、68.23和45.59 mg L⁻¹。Cu是对瘤拟黑螺毒性最大的金属，其次是Cd、Zn、Pb、Ni、Fe、Mn和Al（Cu > Cd > Zn > Pb > Ni > Fe > Mn > Al）。瘤拟黑螺体内金属的生物富集随着暴露浓度的增加而增加，并且Cu在软组织中的积累量最高（富集系数）。将该物种对金属的LC₅₀值与其他淡水腹足类动物的LC₅₀值进行比较，结果表明瘤拟黑螺对金属同样敏感。
