Pandey Aastha, Sharma Chhatra Mani, Kang Shichang, Zhang Qianggong, Tripathee Lekhendra, Guo Junming, Li Xiaofei, Sun Shiwei, Paudyal Rukumesh, Acharya Prakash, Sillanpää Mika
Department of Environmental Science and Engineering, School of Science, Kathmandu University, P.O. Box 6250, Kathmandu, Nepal.
Laboratory of Green Chemistry, Lappeenranta University of Technology, Mikkeli, Finland.
Bull Environ Contam Toxicol. 2017 Oct;99(4):500-505. doi: 10.1007/s00128-017-2161-z. Epub 2017 Aug 24.
This study quantified concentrations of mercury (Hg) and its trophic transfer along the fish community in the Indrawati River, Nepal. Stable isotope ratios of nitrogen (δN) and carbon (δC), complemented by stomach contents data were used to assess the food web structure and trophic transfer of Hg in 54 fishes; 43 Shizothorax richardsonii and 11 Barilius spp. [B. bendelisis (1), B. vagra (3) and B. barila (7)]. Sixty-one muscle samples (including six replicates) were used for the analysis of total mercury (THg) and stable isotopes. Mean THg concentrations in B. spp. and the more common species S. richardsonii was observed to be 218.23 (ng/g, ww) and 90.82 (ng/g, ww), respectively. THg versus total length in both S. richardsonii and B. spp. showed a decreasing tendency with an increase in age. Regression of logTHg versus δN among the fish species showed a significant positive correlation only in S. richardsonii indicating biomagnification along the trophic level in this species.
本研究对尼泊尔因德拉瓦蒂河中汞（Hg）的浓度及其在鱼类群落中的营养转移进行了量化。利用氮（δN）和碳（δC）的稳定同位素比率，并辅以胃内容物数据，来评估54种鱼类中汞的食物网结构和营养转移；其中包括43条李氏裂腹鱼和11条野结鱼属鱼类[孟加拉野结鱼（1条）、瓦氏野结鱼（3条）和高体野结鱼（7条）]。61份肌肉样本（包括6份重复样本）用于总汞（THg）和稳定同位素分析。野结鱼属鱼类和更常见的李氏裂腹鱼的平均总汞浓度分别为218.23（纳克/克，湿重）和90.82（纳克/克，湿重）。李氏裂腹鱼和野结鱼属鱼类的总汞与全长的关系均显示，随着年龄增长呈下降趋势。鱼类物种中logTHg与δN的回归分析表明，仅在李氏裂腹鱼中存在显著正相关，这表明该物种中汞沿营养级发生生物放大作用。
