Abstract：
The contamination of wetlands by heavy metals, exacerbated by agricultural activities, presents a threat to both organisms and humans. Heavy metals may undergo trophic transfer through the food web. However, the methods for quantifying the bioaccumulation and trophic transfer processes of heavy metals based on the food web remains unclear. In this study, we employed stable isotope technology to construct a quantitative oriental white stork\'s typical food web model under a more accurate scaled Δ15N framework. On this basis, the concentrations for heavy metal (Cu, Zn, Hg, Pb) were analyzed, we innovatively visualized the trophic transfer process of heavy metals across 13 nodes and 45 links and quantified the transfer flux based on the diet proportions and heavy metal concentrations of species, taking into account biomagnification effects and potential risks. Our findings revealed that as for Cu and Pb, the transfer flux level was consistent with diet proportion across most links. While Hg and Zn transfer flux level exceeded the corresponding diet proportion in the majority of links. In summary, Hg exhibited a significant biomagnification, whereas Cu, Zn, Pb experienced biodilution. The fish dietary health risk assessment for fish consumers showed that Hg, Pb posed certain risks. This research marks a significant step forward in the quantitative assessment of multi-link networks involving heavy metals within the food web.
摘要：
重金属对湿地的污染，农业活动加剧了，对生物和人类都构成威胁。重金属可以通过食物网进行营养转移。然而,基于食物网的重金属生物累积和营养转移过程的定量方法尚不清楚。在这项研究中,我们采用稳定同位素技术，在更精确的比例Δ15N框架下，构建了定量的东方白鹭典型食物网模型。在此基础上,重金属的浓度(Cu，Zn,Hg,Pb)进行了分析，我们创新性地可视化了13个节点和45个环节的重金属的营养转移过程，并根据饮食比例和物种的重金属浓度对转移通量进行了量化。考虑到生物放大效应和潜在风险。我们的发现表明，至于铜和铅，在大多数环节中，转移通量水平与饮食比例一致。而在大多数环节中，Hg和Zn的转移通量水平超过了相应的饮食比例。总之,汞表现出显著的生物放大作用，而铜，Zn,Pb经历了生物稀释。鱼类消费者的鱼类饮食健康风险评估表明，汞，铅具有一定的风险。这项研究标志着在定量评估涉及食物网中重金属的多链路网络方面迈出了重要一步。
