Impact of internal waves on the spatial distribution of Planktothrix rubescens (cyanobacteria) in an alpine lake
Impact of internal waves on the spatial distribution of Planktothrix rubescens (cyanobacteria) in an alpine lake
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DOI：
10.1038/ismej.2010.154
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发表时间：
2011-04-01
期刊：
影响因子：
11
通讯作者：
Humbert, Jean-Francois
中科院分区：
文献类型：
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作者：
Cuypers, Yannis;Vincon-Leite, Brigitte;Humbert, Jean-Francois
摘要采用2年11个采样点、1个采样站24 h的监测方法，研究了布尔热湖（Lac du Bourget）蓝细菌的垂直和水平分布。已知该物种在温带地区许多深层中营养湖泊的含金属层中增殖，并产生肝毒素。在整个湖泊尺度上观察冬凌草的分布时，我们发现水体中生物量峰值的深度变化很大（可达10 m）。这些变化与等温线位移密切相关。我们还发现蓝藻生物量在湖泊北部和南部的分布有显著差异。我们使用物理建模方法来证明两种内波模式可以解释这些变化。内波是由风事件产生的，但在这些事件结束几天后仍然可以被探测到。最后，我们在一个采样点的24小时调查表明，V1H1的正弦运动可以演变成非线性锋面。这些结果表明，内波对深湖金属元素层中繁殖的冬凌草的分布有重要影响，这一过程可能通过直接影响光有效性来影响该物种的生长。ISME Journal (2011) 5,580 -589；doi: 10.1038 / ismej.2010.154;2010年11月18日在线发布
The vertical and horizontal distribution of the cyanobacterium, Planktothrix rubescens, was studied in a deep alpine lake (Lac du Bourget) in a 2-year monitoring program with 11 sampling points, and a 24-h survey at one sampling station. This species is known to proliferate in the metalimnic layer of numerous deep mesotrophic lakes in temperate areas, and also to produce hepatotoxins. When looking at the distribution of P. rubescens at the scale of the entire lake, we found large variations (up to 10 m) in the depth of the biomass peak in the water column. These variations were closely correlated to isotherm displacements. We also found significant variations in the distribution of the cyanobacterial biomass in the northern and southern parts of the lake. We used a physical modeling approach to demonstrate that two internal wave modes can explain these variations. Internal waves are generated by wind events, but can still be detected several days after the end of these events. Finally, our 24-h survey at one sampling point demonstrated that the V1H1 sinusoidal motion could evolve into nonlinear fronts. All these findings show that internal waves have a major impact on the distribution of P. rubescens proliferating in the metalimnic layer of a deep lake, and that this process could influence the growth of this species by a direct impact on light availability. The ISME Journal (2011) 5, 580-589; doi:10.1038/ismej.2010.154; published online 18 November 2010