Effects of environmental factors on algal and cyanobacterial physiology

农药或其他污染物造成的污染是水生生态系统的一个实际问题。在这些沃茨中发现的浮游植物（藻类和蓝细菌）是食物网的第一个生物体，不幸的是，它们可能对水质变化非常敏感。湖泊和河流很少只受到一种污染物的影响，这些化学品的毒性可能受到其他环境因素的影响，如光线、水温和其他物质。过去很少有研究来了解这些环境压力对藻类和蓝藻生理学的综合影响。 在这项研究计划中，我们将研究杀虫剂与其他环境因素（温度，光照，蓝藻毒素的存在）结合对浮游植物生理学的影响。我们将重点关注这些环境因素对光合作用的影响，以及与光合作用密切相关的过程（类囊体膜脂质合成，碳浓度机制）。我们还将研究浮游植物物种对环境因素组合的抗性机制。更具体地说，非光化学能量耗散过程，替代电子途径和抗氧化剂清除途径将被研究。 这项研究将允许获得不同的环境胁迫对藻类和蓝藻代谢的相互作用的更好的理解。从长远来看，这项研究可能有助于建立新的水质标准的基础上，污染物与自然发生的环境因素的相互作用。

Pollution caused by pesticides or other pollutants is an actual problem for aquatic ecosystems. Phytoplankton (algae and cyanobacteria) found in these waters are the first organisms of the food web and may, unfortunately, be very sensitive to water quality variations. Lakes and rivers are impacted rarely by only one pollutant and the toxicity of these chemicals may be affected by other environmental factors, such as light, water temperature and other substances. Very few studies were performed in the past to understand the combined effect of these environmental stressors on the physiology of algae and cyanobacteria. In this research program we will study the effects of pesticides when combined to other environmental factors (temperature, light, presence of cyanotoxins) on phytoplankton physiology. We will focus on the impacts that these environmental factors have on photosynthesis, but also on processes closely linked to photosynthesis (thylakoid membrane lipid synthesis, carbon concentration mechanisms). We will also study the mechanisms involved in the resistance of phytoplankton species to the combination of environmental factors. More specifically, the non-photochemical energy dissipation processes, the alternative electron pathways and the antioxidant scavenging pathways will be studied. This research will permit to obtain a better understanding of the interaction of different environmental stressors on algal and cyanobacterial metabolism. On a long term, this research may help to establish new water quality criteria based on the interaction of pollutants with natural occurring environmental factors.