Garrido M, Cecchi P, Collos Y, Agostini S, Pasqualini V
UMR 6134 CNRS Sciences for the Environment, UMS 3514 CNRS, Stella Mare, University of Corsica, BP 52, 20250 Corte, France.
UMR MARBEC, IRD - CNRS - Ifremer - University of Montpellier, CC093, 34095 Montpellier Cedex 5, France.
Mar Pollut Bull. 2016 Mar 15;104(1-2):139-52. doi: 10.1016/j.marpolbul.2016.01.049. Epub 2016 Feb 9.
The Biguglia lagoon is a shallow Mediterranean coastal ecosystem where eutrophication is increasing for years. A channel supplying freshwater was cleared in 2009 to enhance lagoon water circulation and alleviate dystrophic crises. Monthly monitoring was started in 2010 to document the impacts of this action on abiotic characteristics and phytoplankton communities. Three stations were surveyed (by microscopy and HPLC). Evidence suggests that this operation had an unexpected outcome. Salinity footprints indicated the succession of three main hydrological sequences that depended on rainfall and circulation pattern. Diatoms and dinoflagellates dominated the first sequence, characterized by heavy rainfall, while Prorocentrum minimum became progressively the dominant species in the second period (increasing salinities) with extensive bloom over the whole lagoon (5.93×10-(5) cells·L(-1)) during the third period. These phytoplankton successions and community structures underline the risk of pernicious effects arising from remediation efforts, in the present case based on increasing freshwater inputs.
比古利亚泻湖是一个浅海地中海沿岸生态系统，多年来富营养化问题日益严重。2009年清理了一条供应淡水的渠道，以增强泻湖水循环并缓解营养不良危机。2010年开始每月进行监测，以记录这一行动对非生物特征和浮游植物群落的影响。对三个站点进行了调查（通过显微镜检查和高效液相色谱法）。有证据表明，这一行动产生了意想不到的结果。盐度足迹表明了三个主要水文序列的演替，这取决于降雨和环流模式。硅藻和甲藻在第一个序列中占主导地位，其特征是降雨量大，而微小原甲藻在第二个时期（盐度增加）逐渐成为优势物种，在第三个时期整个泻湖出现大量繁殖（5.93×10-(5) 个细胞·L(-1)）。这些浮游植物的演替和群落结构突显了修复努力可能产生有害影响的风险，在本案例中是基于增加淡水输入。
