12月08日（周五）下午15:00 Claude Fortin教授2017年学术报告之三十九“Periphyton as an indicator of metal bioavailability in natural waters”

报告题 目：Periphyton as an indicator of metal bioavailability in natural waters

报 告  人：Claude Fortin 教授  

          加拿大国立科学研究院水、地与环境研究中心教授                        

时          间：2017年12月08日（周五）下午3:00

地          点：中山大学广州校区东校园环境大楼A206会议室

主          持：赵春梅副教授

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报告人简介:

Claude Fortin是加拿大国立科学研究院水、地与环境研究中心教授，痕量金属地球化学循环领域加拿大首席科学家（Canada Research Chair）。研究关注水化学形态（自由离子浓度），介质组成（pH, Ca, Mg, 溶解有机物）和水生微生物（浮游植物，生物膜）累积/效应之间的关系，并开发模型描述三者之间的关联。目前的研究工作，包括金属水化学形态分析技术（离子交换，超滤，平衡透析，离子选择电极）和热动力学模拟。这些工作用于理解金属如何穿过单细胞水生生物质膜，金属被同化后的亚细胞分布状况及其解毒机制。通过对吸收机制的研究，开发出适用于野外的生物监测工具（如生物膜），以量化人类活动所导致的金属暴露及其风险。Fortin 教授，近7年来在EST等国际知名专业期刊，发表研究论文36篇，2016年获得痕量金属地球化学循环领域“加拿大首席科学家（Canada Research Chair）”项目。

Abstract

In Québec, Canada, there are currently 140 abandoned mine tailings sites. These metal-rich piles of oxidized residues slowly leach to surrounding aquatic environments. However, assessing metal contamination in aquatic ecosystems can be complex. For example, trace metal concentrations in surface waters fluctuate over time due to rapid and large changes in runoff inputs and flow regimes. Therefore, numerous sampling campaigns are necessary to adequately monitor metal contamination. The purpose of this work is to develop a biomonitoring tool using freshwater biofilms as proxy of metal exposure to aquatic organisms. Algae are at the base of the food chain and are particularly important for assessing the level of metal bioaccumulation and potential trophic transfer to higher organisms. We collected biofilm samples in many areas in Eastern Canada and have observed clear relationships between free metal ion and biofilm metal concentrations. We also examined the effects of water hardness and pH on metal accumulation by periphyton. Our results suggest that metal content in biofilm cells is a robust indicator of metal exposure and that periphyton makes a promising biomonitoring tool.