Cycling and trophic transfer of metals in a changing environment

变化环境中金属的循环和营养转移

• 批准号: RGPIN-2018-04810
• 负责人: Amyot, Marc
• 金额: $ 3.42万
• 依托单位: Université de Montréal
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2018
• 资助国家: 加拿大
• 起止时间: 2018-01-01 至 2019-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=643882
• 关键词: Cycling; trophic; transfer; metals; changing

Climate change, new mining projects, increased atmospheric deposition from emerging Asian economies, and introduction of new substances in urban areas will modify the emission, transport, transformation and fate of metals in Canada, with unknown consequences on ecosystem health. For instance, there are currently 200 mining projects under consideration for rare earth elements (REEs) in Canada, a group of metals little known from an ecotoxicological standpoint, whereas mercury (Hg) emissions are expected to rise considerably in the next decades. Our long-term research plan focuses on the biogeochemistry and food web transfer of metals up to human exposure in changing environment. In the past 6 years, I (co)supervised 58 highly qualified personnel (HQP); my team and I published 37 peer-reviewed papers and presented 121 times at conferences. In the next five years, we will build on our recent advances by conducting targeted studies on emerging issues related to metal biogeochemistry. Theme 1. First, our recent work has suggested that aquatic biofilms may form key sites of transformations of Hg in the North (unstratified polar thaw ponds) and in the south (St. Lawrence River). We will establish what controls metal complexation in these biofilms and how emergent contaminants such as microplastics, can modify biofilm/metal interactions. Theme 2. Most trophic transfer studies of contaminants use stable isotopes of N and C to understand food web relationships and transfer. We will assess a complementary conceptual approach based on subcellular partitioning of metals and use it on single metals, including those of emergent concerns (i.e. REE), and antagonistic combinations of metals. ***16 HQP will be trained through this interdisciplinary program, at the intersection of ecology, toxicology, genomics and analytical chemistry, preparing them for the job market of tomorrow. ***This program will allow to better predict the fate and effect of metals in a changing environment. It will lead to significant fundamental advances regarding the role of aquatic biofilms in metal cycling and the mechanism involved in metal trophic transfer. The data generated on REE transformation and trophic transfer will be the first of this kind in Canada and will inform decision-makers at the dawn of an era of REE mining in this country. The study on the effect of MP on metal cycling will likely be the first in Canada and will help assess risk associated with this emerging threat.

气候变化，新的采矿项目，增加了新兴亚洲经济体的大气沉积以及在城市地区引入新物质将改变加拿大金属金属的发射，运输，转型和命运，并对生态系统健康产生不明的影响。例如，目前正在考虑加拿大稀土元素（REES）的200个采矿项目，从生态毒理学的角度来看，一组金属鲜为人知，而汞（HG）排放量预计将在未来几十年中大幅上升。我们的长期研究计划着重于在不断变化的环境中向人类接触的金属的生物地球化学和食物网络转移。在过去的6年中，我（CO）监督了58名高素质的人员（HQP）；我和我的团队发表了37份同行评审的论文，并在会议上介绍了121次。在接下来的五年中，我们将通过对与金属生物地球化学有关的新兴问题进行针对性的研究，以我们最近的进步为基础。主题1。首先，我们最近的工作表明，水生生物膜可能形成北部汞转型的关键地点（未分层的极地融化池塘）和南部（圣劳伦斯河）。我们将建立哪些控制金属络合物中的金属络合物以及微塑料等新兴污染物如何改变生物膜/金属相互作用。主题2。大多数污染物的营养转移研究都使用N和C的稳定同位素来了解食物网络关系和转移。我们将根据金属的亚细胞分配来评估一种互补的概念方法，并将其用于单个金属，包括紧急问题的金属（即REE）和金属的拮抗组合。 *** 16 HQP将通过该跨学科计划进行培训，即生态学，毒理学，基因组学和分析化学的交集，为明天的就业市场做好准备。 ***该程序将允许在不断变化的环境中更好地预测金属的命运和影响。这将导致关于水生生物膜在金属循环中的作用以及与金属营养转移有关的机制的显着基本进步。 REE转型和营养转移产生的数据将是加拿大第一个此类数据，并将在该国REE采矿时代的曙光中告知决策者。关于MP对金属自行车的影响的研究可能是加拿大的第一项，并将有助于评估与这一新兴威胁相关的风险。