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Phytoplankton and ecological assessment of brackish and freshwater coastal lagoons in the Algarve, Portugal

机译:葡萄牙阿尔加威咸淡水和淡水沿海泻湖的浮游植物和生态学评估

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摘要

Phytoplankton biomass and composition were monitored for four coastal lagoons of the Algarve, Portugal, from February to November 2006. The phytoplankton community in the freshwater lagoons - Dunas Douradas (FW1) and Garrao (FW2) - as determined by biomarker pigment concentration using high-performance liquid chromatography and the program CHEMTAX, was dominated by diatoms and chlorophytes. For the brackish lagoons - Salgados (BW1) and Almargem (BW2) - cyanophytes and diatoms were the most important groups respectively. The trophic state indices, based on algal biomass, classify FW1, FW2 and BW1 lagoons as hypertrophic, whereas BW2 is classified as mesotrophic. Signs of eutro-phication in the former lagoons include large phytoplankton biomass (chlorophyll-a) fluctuations, the presence of phytoplankton taxa that usually thrive under nutrient-enriched conditions and high concentrations of chlorophyll-a-degradation products. Chemotaxonomic analyses derived from high-performance liquid chromatography data might constitute a valuable tool for achieving Water Framework Directive requirements for an evaluation system based on phytoplankton taxo-nomic composition.
机译:从2006年2月至11月,对葡萄牙阿尔加威的四个沿海泻湖的浮游植物生物量和组成进行了监测。淡水泻湖中的浮游植物群落-Dunas Douradas(FW1)和Garrao(FW2)-通过使用高浓度生物标志物色素浓度确定高效液相色谱法和CHEMTAX程序被硅藻和绿藻类所占据。对于咸咸湖-萨尔加多斯(BW1)和阿尔玛金(BW2)-蓝藻和硅藻分别是最重要的组。基于藻类生物量的营养状态指数将FW1,FW2和BW1泻湖分类为肥大,而BW2被分类为中营养。前泻湖富营养化的迹象包括大量浮游植物生物量(叶绿素-a)波动,浮游植物类群的存在(通常在营养丰富的条件下壮成长)和高浓度的叶绿素-a降解产物。从高效液相色谱数据中得出的化学分类学分析可能构成一种有价值的工具,可用于实现基于浮游植物分类学组成的评估系统对水框架指令的要求。

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