Department of Science, Qiqihar University, Qiqihar, 161006, People's Republic of China.
College of Life Science and Agriculture Forestry, Qiqihar University, Qiqihar, 161006, People's Republic of China.
Environ Sci Pollut Res Int. 2022 Apr;29(17):25222-25233. doi: 10.1007/s11356-021-17675-0. Epub 2021 Nov 27.
The transfer and fate of methylmercury (MeHg) in typical components, such as sediment, sediment-inhabiting animals, pelagic fish, and three large waterfowls, namely, red-crowned crane (Grus japonensis), mallard (Anas platyrhynchos), and oriental stork (Ciconia boyciana), of the ecosystem in China's Zhalong Wetland were examined using equivalence-based mass balance model. The biomagnification degree of MeHg increased on the species at the high trophic level of the system. Hence, elevated MeHg concentration (3.2 μg g, dry weight) was detected in the endangered G. japonensis. The accumulation of the organometal generally followed the decreasing order of oriental stork (carnivore) > mallard (omnivore) > red-crowned crane (omnivore). The predicted results of MeHg at each node of the food web were generally in accordance with the measured values (F = 0.09, P = 0.78), implying that the model is suitable for the prediction of MeHg fate in the inland aquatic system. According to the model, the respiration for the species at low trophic strata was the key input source of MeHg, but ingestion played an important role for MeHg intake in the species at the high trophic position in the food web. Metabolism was a crucial pathway of MeHg loss for the top predators in the ecosystem.
采用基于等效质量平衡模型，研究了中国扎龙湿地生态系统中典型成分（如沉积物、底栖动物、浮游鱼类和三种大型水禽，即丹顶鹤、绿头鸭和东方白鹳）中甲基汞（MeHg）的迁移和归宿。MeHg 的生物放大程度在系统的高营养级物种中增加。因此，在濒危的丹顶鹤中检测到升高的 MeHg 浓度（3.2μg g，干重）。有机金属的积累通常遵循以下顺序：东方白鹳（肉食动物）>绿头鸭（杂食动物）>丹顶鹤（杂食动物）。食物网中每个节点的 MeHg 预测结果通常与实测值相符（F=0.09，P=0.78），这意味着该模型适用于内陆水生系统中 MeHg 归宿的预测。根据模型，低营养级物种的呼吸作用是 MeHg 的关键输入源，但在食物链中高营养级物种中，摄食对 MeHg 的摄入起着重要作用。对于生态系统中的顶级捕食者来说，新陈代谢是 MeHg 损失的关键途径。
