Temporal variation of β-diversity and assembly mechanisms in a bacterial metacommunity
Temporal variation of β-diversity and assembly mechanisms in a bacterial metacommunity
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DOI：
10.1038/ismej.2011.177
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发表时间：
2012-06-01
期刊：
影响因子：
11
通讯作者：
Szekely, Anna J.
中科院分区：
文献类型：
--
作者：
Langenheder, Silke;Berga, Merce;Szekely, Anna J.
群落组成在空间上的转换受到不同组合机制的影响，这些组合机制对环境条件和物种相互作用等局部生境因素和分布和历史等区域因素的权重不同。几个装配机制可能同时起作用；然而，人们对它们的重要性如何随时间而变化以及原因知之甚少。在这里，我们实施了一项实地调查，我们在1年内11次取样了一个由位于瑞典波罗的海沿岸的17个岩石池组成的细菌元群落。我们利用变异分配确定了不同组合机制在多大程度上构成了群落，并研究了不同环境梯度下β多样性的变化。在总体生产力和环境异质性较高的时期，元群落的β -多样性最高，至少部分原因是物种分选，即根据当时的环境条件对分类群进行选择。相比之下，分散驱动的装配机制主要在β多样性相对较低的时候被检测到。没有迹象表明永久池和临时池之间的群落组成或beta多样性存在强烈和持久的差异，这表明物理干扰机制的重要性相对较小。总之，我们的研究清楚地表明，与非生物因素相关的不同组装机制的相对重要性存在时间差异，并表明这些因素的时间变异性对于更全面地了解细菌元群落动态非常重要。ISME学报（2012）6,1107-1114；doi: 10.1038 / ismej.2011.177;2011年12月8日在线发布
The turnover of community composition across space, beta-diversity, is influenced by different assembly mechanisms, which place varying weight on local habitat factors, such as environmental conditions and species interactions, and regional factors such as dispersal and history. Several assembly mechanisms may function simultaneously; however, little is known about how their importance changes over time and why. Here, we implemented a field survey where we sampled a bacterial metacommunity consisting of 17 rock pools located at the Swedish Baltic Sea coast at 11 occasions during 1 year. We determined to which extent communities were structured by different assembly mechanisms using variation partitioning and studied changes in beta-diversity across environmental gradients over time. beta-Diversity was highest at times of high overall productivity and environmental heterogeneity in the metacommunity, at least partly due to species sorting, that is, selection of taxa by the prevailing environmental conditions. In contrast, dispersal-driven assembly mechanisms were primarily detected at times when beta-diversity was relatively low. There were no indications for strong and persistent differences in community composition or beta-diversity between permanent and temporary pools, indicating that the physical disturbance regime is of relatively minor importance. In summary, our study clearly suggests that there are temporal differences in the relative importance of different assembly mechanisms related to abiotic factors and shows that the temporal variability of those factors is important for a more complete understanding of bacterial metacommunity dynamics. The ISME Journal (2012) 6, 1107-1114; doi:10.1038/ismej.2011.177; published online 8 December 2011