INRA, UMR985 Écologie et Santé des Écosystèmes, Équipe Écotoxicologie et Qualité des Milieux Aquatiques, Agrocampus Ouest, 65 rue de Saint Brieuc, F-35042 Rennes, France; Service Environnement, TOTAL, Pôle d'Etude et de Recherche de Lacq, RN 117, BP 47, F-64170 Lacq, France.
INRA, UMR985 Écologie et Santé des Écosystèmes, Équipe Écotoxicologie et Qualité des Milieux Aquatiques, Agrocampus Ouest, 65 rue de Saint Brieuc, F-35042 Rennes, France.
Environ Pollut. 2014 Sep;192:186-95. doi: 10.1016/j.envpol.2014.05.023. Epub 2014 Jun 21.
The sensitivity of diatom taxonomy and trait-based endpoints to chemicals has been poorly used so far in Environmental Risk Assessment. In this study, diatom assemblages in outdoor flow-through mesocosms were exposed to thiram (35 and 170 μg/L), and a hydrocarbon emulsion (HE; 0.01, 0.4, 2 and 20 mg/L). The effects of exposure were assessed for 12 weeks, including 9 weeks post-treatment, using taxonomic structure and diversity, bioindication indices, biological traits, functional diversity indices, indicator classes and ecological guilds. For both chemicals, diversity increased after the treatment period, and responses of ecological traits were roughly identical with an abundance increase of motile taxa tolerant to organic pollution and decrease of low profile taxa. Bioindication indices were not affected. Traits provided a complementary approach to biomass measurements and taxonomic descriptors, leading to a more comprehensive overview of ecological changes due to organic chemicals, including short- and long-term effects on biofilm structure and functioning.
迄今为止，在环境风险评估中，对藻类分类学和基于特征的终点对化学物质的敏感性的应用还很不完善。在这项研究中，在户外流动式中试生物箱中暴露于福美双（35 和 170μg/L）和烃乳液（HE；0.01、0.4、2 和 20mg/L）的藻类组合。使用分类结构和多样性、生物指示指数、生物特征、功能多样性指数、指示类和生态类群，评估了暴露 12 周的影响，包括治疗后 9 周。对于这两种化学物质，多样性在处理期后增加，并且生态特征的反应大致相同，表现为对有机污染有耐受性的运动型分类群的丰度增加，以及低轮廓分类群的丰度减少。生物指示指数不受影响。特征提供了对生物量测量和分类描述符的补充方法，导致对由于有机化学品引起的生态变化有更全面的了解，包括对生物膜结构和功能的短期和长期影响。
