Department of Environmental Marine Sciences, College of Science and Technology, Hanyang University, Ansan, 426-791, South Korea.
Environ Sci Pollut Res Int. 2011 Aug;19(7):2570-80. doi: 10.1007/s11356-012-1044-4. Epub 2012 Jun 28.
An assessment was made to monitor the short-term impact of heavily polluted sediments that may move out from the brackish man-made Lake Shihwa outside of the sea dike due to operations of a tidal power plant. Here, we exposed the Manila clam Ruditapes philippinarum collected from the western coast of Korea to natural sediment under lab condition for 96 h. Sediments were collected from Lake Shihwa and outside of the sea dike representing polluted and reference conditions, respectively. The results of chemical analysis revealed that the concentrations of nonylphenol and heavy metals in water and sediment from the inner region of Lake Shihwa were significantly higher than those of reference sediments. After 48 and 96 h of exposure, 30 specimens of clams were sampled from each experimental condition, and concentrations of nonylphenol and metals were measured in clams, water, and sediments. Several biomarkers, including concentrations of metallothionein-like proteins, and activities of the antioxidant enzymes glutathione S-transferase and catalase were determined in clams to characterize the effects of polluted sediments to clams. After 96 h of exposure, R. philippinarum assimilated nonylphenol up to 71 times compared to initial concentrations. However, there was no apparent uptake of heavy metals into the clams. Additionally, antioxidant enzymes exhibited higher activities in clams exposed to the polluted sediment. The results of the present study with physiological responses in R. philippinarum suggest that sediment transportation caused by the operation of a tidal power plant in Lake Shihwa will have striking effects on benthic organisms in the adjacent coastal area.
我们评估了潮汐能发电厂运行可能导致的来自于咸淡水人工湖西湖（Shihwa）的受污染底泥向外漂移对近海堤坝的短期影响。在这里，我们在实验室条件下，将从韩国西海岸采集的菲律宾蛤仔（Ruditapes philippinarum）暴露于天然沉积物中 96 小时。沉积物分别取自西湖和近海堤坝外，代表污染和对照条件。化学分析结果表明，西湖内湖水和沉积物中壬基酚和重金属的浓度明显高于对照沉积物。暴露 48 和 96 小时后，从每个实验条件中采集 30 个蛤样本，测量蛤、水和沉积物中的壬基酚和金属浓度。为了评估污染沉积物对蛤的影响，我们还测定了蛤体内金属硫蛋白样蛋白的浓度和抗氧化酶谷胱甘肽 S-转移酶和过氧化氢酶的活性等几种生物标志物。暴露 96 小时后，与初始浓度相比，菲律宾蛤仔体内的壬基酚累积量增加了 71 倍。然而，重金属并没有明显进入蛤体内。此外，暴露于污染沉积物中的抗氧化酶活性更高。本研究通过菲律宾蛤仔的生理反应结果表明，潮汐能发电厂在西湖运行导致的底泥输送将对邻近沿海地区的底栖生物产生显著影响。
