The role of the freshwater oligochaete Limnodrilus hoffmeisteri in the distribution of Se in a water/sediment microcosm
The role of the freshwater oligochaete Limnodrilus hoffmeisteri in the distribution of Se in a water/sediment microcosm
复制标题
淡水寡毛类 Limnodrilus hoffmeisteri 在水/沉积物微观世界中硒分布中的作用
DOI：
10.1016/j.scitotenv.2019.06.170
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发表时间：
2019
影响因子：
9.8
通讯作者：
Xie Lingtian
中科院分区：
文献类型：
--
作者：
Chen Hongxing;Yan Liang;Zhao Jianliang;Yang Bin;Huang Guoyong;Shi Wenjun;Hou Liping;Zha Jinmiao;Luo Yongju;Mu Jingli;Dong Wu;Ying Guang Guo;Xie Lingtian
Selenite(IV) and selenate(VI) are the major species of Se in the seleniferous aquatic ecosystem. The redistribution of Se in the water/sediment microcosm by bioturbation remains largely unknown. In this study, the redistribution of Se in the water/sediment microcosm by the benthic oligochaeteLimnodrilus hoffmeisteriwas assessed. The worms were exposed to 2–40 μg/g dry weight of Se(IV) or Se(VI) in the sediment (diet) for 2 months. The changes in the Se levels in different compartments of the microcosm (sediment, overlying water, and worms) were quantified after 2 weeks and 2 months. The subcellular distribution of Se in the worms were also evaluated. Finally, the volatilization of Se from the two Se sources was estimated. The results showed that Se concentration in the overlying water and Se bioaccumulation in the worms were increased with Se levels in the sediments. Approximately 1.6–9.8% of Se was volatilized in the absence of the worms and was intensified in the presence of the worms (2.1–25.7%). The subcellular distribution witnessed high levels of Se in the cell debris (>60%). Se(IV) and Se(VI) differ in their bioaccumulation, redistribution and the effects on the growth of the worms. Our results suggest that the bioturbation by benthos play an essential role in the redistribution of Se in the water/sediment microcosm.
