Effets chroniques de Microcystis aeruginosa et Oscillatoria sp., prélevées de la retenue El Kansera (Maroc), sur la survie et la reproduction de Daphnia magna Strauss
Effets chroniques de Microcystis aeruginosa et Oscillatoria sp., prélevées de la retenue El Kansera (Maroc), sur la survie et la reproduction de Daphnia magna Strauss
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DOI：
10.1080/12538078.2005.10515455
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发表时间：
2005-03
影响因子：
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通讯作者：
Bouchra Naji;M. Derraz;A. Dauta;L'houssaine Boumnich;El Ouazna Bouchama
中科院分区：
文献类型：
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作者：
Bouchra Naji;M. Derraz;A. Dauta;L'houssaine Boumnich;El Ouazna Bouchama
摘要研究了铜绿微囊藻（Microcystis aeruginosa）和颤藻（Oscillatoria sp.）大型蚤（枝角类）的生存和繁殖。在20°C和16：8 L/D循环下，将幼年动物在100 ml容器中单独暴露于不同的食物（栅藻属）和蓝藻（微囊藻属或颤藻属）浓度。每个处理组合有10个重复。暴露时间为21天，这段时间足以估计种群的内在增长率。每两天将动物转移至新鲜处理培养基中。M.铜绿假单胞菌和颤藻的存活率和繁殖率均降低。麦格纳随着蓝藻浓度的增加和栅藻浓度的降低，其毒性效应增加。青少年比成年人对高浓度的M.铜绿。此外，研究结果表明，老化的蓝藻培养物比新鲜的毒性更大。
Abstract The aim of this study is to investigate the effects of two cyanobacteria (Microcystis aeruginosa and Oscillatoria sp.) on the survival and reproduction of Daphnia magna (Cladocera). Juvenil animals were exposed individualy in 100 ml vessels to different food (Scenedesmus) and cyanobacteria (Microcystis ou Oscillatoria) concentrations at 20°C and a 16: 8 L/D cycle. There were 10 replicates per treatment combination. The time of exposure was 21 days, a period sufficient for estimation of the population intrinsic growth rate. The animals were transferred to fresh treatment media each two days. M. aeruginosa and Oscillatoria sp reduced survival and reproduction of D. magna. The toxic effect increased with increasing concentrations of cyanobacteria and decreasing concentrations of Scenedesmus crassus. Juveniles were more sensitive than adults to high levels of M. aeruginosa. Furthermore, the study results show that aged cultures of cyanobacteria were more toxic than fresh one.