Stareso MedSeA mesocosm experiment: field and perturbation studies 2012@en

A joint mesocosm experiment took place in June/July 2012 in Corsica (bay of Calvi, Stareso station;http://www.stareso.com/) as part of the european MedSeA project. Nine mesocosms (52 m**3) were deployed over a 20 days period and 6 different levels of pCO2 and 3 control mesocosms (about 450 µatm), were used, in order to cover the range of pCO2 anticipated for the end of the present century. During this experiment, the potential effects of these perturbations on chemistry, planktonic community composition and dynamics including: eucaryotic and prokaryotic species composition, primary production, nutrient and carbon utilization, calcification, diazotrophic nitrogen fixation, organic matter exudation and composition, micro-layer composition and biogas production were studied by a group of about 25 scientists from 8 institutes and 6 countries. This is one of the first mesocosm experiments conducted in oligotrophic waters. A blog dedicated to this experiment can be viewed at: http://medseastareso2012.wordpress.com/.本联合中型受控生态系统（mesocosm）实验于2012年6至7月在科西嘉岛卡尔维湾Stareso站（http://www.stareso.com/）开展，系欧盟MedSeA项目的组成部分。实验期间共布设9个中型受控生态系统单元，单个体积为52立方米，实验周期为20天；设置6组不同二氧化碳分压（pCO₂）梯度，并配备3个对照生态箱（二氧化碳分压约450微大气压），以覆盖本世纪末预期的大气二氧化碳分压变化范围。由来自6个国家、8家科研机构的约25名科学家组成的研究团队，针对该二氧化碳分压扰动在水体化学、浮游生物群落组成与动态等方面的潜在影响展开了系统研究，具体观测指标包括真核与原核生物物种组成、初级生产力、营养盐与碳利用、钙化作用、生物固氮（diazotrophic nitrogen fixation）、有机质分泌与组成、微表层组成以及生物气产生等。本实验是在寡营养水域（oligotrophic waters）中开展的首批中型受控生态系统实验之一。本次实验的专属博客可通过以下网址访问：http://medseastareso2012.wordpress.com/