12月08日（周五）下午15:00 Claude Fortin教授2017年學術報告之三十九“Periphyton as an indicator of metal bioavailability in natural waters”

報告題 目：Periphyton as an indicator of metal bioavailability in natural waters

報 告  人：Claude Fortin 教授  

          加拿大國立科學研究院水、地與環境研究中心教授                        

時          間：2017年12月08日（周五）下午3:00

地          點：太阳集团app首页廣州校區東校園環境大樓A206會議室

主          持：趙春梅副教授

歡迎廣大師生參加！

報告人簡介:

Claude Fortin是加拿大國立科學研究院水、地與環境研究中心教授，痕量金屬地球化學循環領域加拿大首席科學家（Canada Research Chair）。研究關注水化學形态（自由離子濃度），介質組成（pH, Ca, Mg, 溶解有機物）和水生微生物（浮遊植物，生物膜）累積/效應之間的關系，并開發模型描述三者之間的關聯。目前的研究工作，包括金屬水化學形态分析技術（離子交換，超濾，平衡透析，離子選擇電極）和熱動力學模拟。這些工作用于理解金屬如何穿過單細胞水生生物質膜，金屬被同化後的亞細胞分布狀況及其解毒機制。通過對吸收機制的研究，開發出适用于野外的生物監測工具（如生物膜），以量化人類活動所導緻的金屬暴露及其風險。Fortin 教授，近7年來在EST等國際知名專業期刊，發表研究論文36篇，2016年獲得痕量金屬地球化學循環領域“加拿大首席科學家（Canada Research Chair）”項目。

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.