The bacterial community composition of the surface microlayer in a high mountain lake.
The bacterial community composition of the surface microlayer in a high mountain lake.
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DOI：
10.1111/j.1574-6941.2010.00904.x
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发表时间：
2010-09
影响因子：
4.2
通讯作者：
Sommaruga R
中科院分区：
文献类型：
--
作者：
Hörtnagl P;Pérez MT;Zeder M;Sommaruga R
水生生态系统中细菌菌群的存在是公认的，但对其组成和动态知之甚少，特别是在湖泊中。与浮游细菌相比，气-水边界的极端条件可能以不同的方式影响其动力学。在本研究中，我们评估了连续两个无冰季节高寒湖泊表层微层（SML） （900 μm以上）和下垫水（ULW） （0.2-0.5 m深度）主要细菌群的定量变化。采用寡核苷酸探针催化报告菌沉积法对细菌群落组成进行了分析。此外，还测量了几个物理化学参数来表征这两个水层。溶解有机碳在SML中持续富集，溶解有机质池呈现出明显的光降解和光漂白信号。表层水温普遍低于地下水温。SML和ULW的细菌群落以Betaproteobacteria和放线菌obacteria为主。两层细菌群落组成与不同理化因子的组合有关，但两层的时间变化趋势相似。我们的研究结果确定高山湖泊的SML是一个微栖息地，其中特定的细菌成员，如Betaproteobacteria似乎是有效的定殖者。
The existence of bacterioneuston in aquatic ecosystems is well established, but little is known about its composition and dynamics, particularly in lakes. The bacterioneuston underlies extreme conditions at the air–water boundary, which may influence its dynamics in a different way compared with the bacterioplankton. In this study, we assessed quantitative changes in major bacterial groups of the surface microlayer (SML) (upper 900 μm) and the underlying water (ULW) (0.2–0.5 m depth) of an alpine lake during two consecutive ice-free seasons. Analysis of the bacterial community composition was done using catalyzed reporter deposition FISH with oligonucleotide probes. In addition, several physicochemical parameters were measured to characterize these two water layers. Dissolved organic carbon was consistently enriched in the SML and the dissolved organic matter pool presented clear signals of photodegradation and photobleaching. The water temperature was generally colder in the SML than in the subsurface. The bacterial community of the SML and the ULW was dominated by Betaproteobacteria and Actinobacteria. The bacterial community composition was associated with different combinations of physicochemical factors in these two layers, but temporal changes showed similar trends in both layers over the two seasons. Our results identify the SML of alpine lakes as a microhabitat where specific bacterial members such as of Betaproteobacteria seem to be efficient colonizers.
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影响因子：
4.5
作者：
Bertilsson, S;Tranvik, LJ
通讯作者：
Tranvik, LJ
影响因子：
2
作者：
CONRAD, R;SEILER, W
通讯作者：
SEILER, W
影响因子：
64.8
作者：
CARLSON, DJ
通讯作者：
CARLSON, DJ
影响因子：
4.2
作者：
Agogué, H;Casamayor, EO;Lebaron, P
通讯作者：
Lebaron, P
影响因子：
1.4
作者：
Joux, F;Agogué, H;Lebaron, P
通讯作者：
Lebaron, P