Experimental insights into the importance of ecologically dissimilar bacteria to community assembly along a salinity gradient
Experimental insights into the importance of ecologically dissimilar bacteria to community assembly along a salinity gradient
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DOI：
10.1111/1462-2920.14059
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发表时间：
2018-03-01
影响因子：
5.1
通讯作者：
Beier, Sara
中科院分区：
文献类型：
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作者：
Shen, Dandan;Juergens, Klaus;Beier, Sara
当地社区对海洋-淡水过渡的反应以及社区集会的基础过程尚不清楚，特别是关于生命策略不同的细菌。在这里，我们实施了一个移植实验，其中浮游细菌从三个地区的波罗的海不同的盐度（约3，7和28 psu）暴露于彼此的环境条件。我们发现，栖息地专家更丰富的比通才暴露后的盐度变化，无论他们的起源。在盐度变化后选择的大多数专家在初始社区中是罕见的。选择通才，但是，并没有特别驱动的招聘稀有或丰富的成员，这表明分类群的初始丰度是次要的通才的增长。系统发育相关性的模式表明，环境过滤是最有影响力的专家组装机制，而竞争性的相互作用是更重要的通才组装。总而言之，这项研究表明，大的盐度变化促进建立栖息地专家和确定性过程不同的生态不同类群在社会集会。因此，我们建议，区分不同的社区成员的组装机制有助于理解和预测社区动态响应环境变化。
The response of local communities to marine-freshwater transitions and the processes that underlie community assembly are unclear, particularly with respect to bacteria that differ in their life strategies. Here, we implemented a transplant experiment where bacterioplankton from three regions of the Baltic Sea with differing salinities (approximate to 3, 7 and 28 psu) were exposed to each other's environmental conditions. We found that habitat specialists were more abundant than generalists after exposure to salinity changes, irrespective of their origins. Most specialists that were selected following a salinity change were rare in the starting communities. Selection for generalists, however, was not specifically driven by the recruitment of either rare or abundant members, suggesting that taxon's initial abundance is minor relevant to the growth of generalists. Patterns in phylogenetic relatedness indicated that environmental filtering was the most influential assembly mechanism for specialists, whereas competitive interaction was more important for the assembly of generalists. Altogether, this study shows that large salinity changes promote the establishment of habitat specialists and that deterministic processes vary during community assembly for ecologically dissimilar taxa. We, therefore, propose that distinguishing assembly mechanisms of different community members helps understand and predict community dynamics in response to environmental change.