Effects of trophic status on microcystin production and the dominance of cyanobacteria in the phytoplankton assemblage of Mediterranean reservoirs.
Effects of trophic status on microcystin production and the dominance of cyanobacteria in the phytoplankton assemblage of Mediterranean reservoirs.
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DOI：
10.1038/srep17964
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发表时间：
2015-12-09
影响因子：
4.6
通讯作者：
Lugliè A
中科院分区：
文献类型：
--
作者：
Mariani MA;Padedda BM;Kaštovský J;Buscarinu P;Sechi N;Virdis T;Lugliè A
我们的研究的目的是评估丰富的蓝藻和微囊藻毒素在四个撒丁岛水库（意大利）的特点是不同的营养状态，以确定一个参考图片为未来的变化。由于气候变化，特别是在地中海南部，预计富营养化程度和蓝细菌数量将不断增加。因此，深入研究有害蓝藻的发生对于在当地范围内制定适当的水资源管理策略非常重要。在18个月期间，在每个水库的一个站点每月收集样本。相似性分析表明，各水库蓝藻丰度和种类组成存在显著差异。Reddit分析强调了它们与营养、水文和季节模式的关系。斯皮尔曼分析表明，主要种类（浮游丝藻、水华束丝藻和浮游长籽藻）与营养盐和微囊藻毒素之间存在显著相关性。我们强调，在最大微囊藻毒素浓度期间的物种组成不同于通常报告的其他地中海网站。我们发现了新的潜在微囊藻毒素生产者（Aphanizomenon klebahnii，Dolichospermum macrosporum和Dolichospermum viguieri），这强调了地中海地区蓝藻的高度多样性，需要在当地范围内进行详细的研究。
The aim of our study was to evaluate the abundance of cyanobacteria and microcystins in four Sardinian reservoirs (Italy) characterised by different trophic status to define a reference picture for future changes. Increasing levels of eutrophication and the abundance of cyanobacteria are expected to occur due to climate change, especially in the southern Mediterranean. Consequently, an in-depth study of the occurrence of harmful cyanobacteria is important to develop appropriate management strategies for water resources at a local scale. Monthly samples were collected at one station in each reservoir over an 18-month period. The Analysis of similarity indicated that cyanobacterial abundance and species composition differed significantly among the reservoirs. The Redundancy analysis highlighted their relationship to trophic, hydrological and seasonal patterns. Spearman’s analysis indicated that there were significant correlations among the most important species (Planktothrix agardhii–rubescens group, Aphanizomenon flos-aquae and Dolichospermum planctonicum), nutrients and microcystins. We highlighted that the species composition during periods of maximum microcystin concentrations differed from those typically reported for other Mediterranean sites. We found new potential microcystin producers (Aphanizomenon klebahnii, Dolichospermum macrosporum and Dolichospermum viguieri), which emphasised the high diversity of cyanobacteria in the Mediterranean area and the need for detailed research at the local scale.