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首页> 外文期刊>The ISME journal emultidisciplinary journal of microbial ecology >Local biotic interactions drive species-specific divergence in soil bacterial communities
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Local biotic interactions drive species-specific divergence in soil bacterial communities

机译：局部生物相互作用在土壤细菌社区中的特异性差异

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摘要

It is well accepted that environmental heterogeneity and dispersal are key factors determining soil bacterial community composition, yet little is known about the role of local biotic interactions. Here we address this issue with an abundance-manipulation experiment that was conducted in a semiarid grassland. We manually increased the abundance of six randomly chosen resident bacterial species in separate, closed, communities and allowed the communities to recover in situ for 1 year. The single episode of increase in the abundance of different species drove species-specific community divergence accompanied by a decline in local diversity. Four of the six added species caused a decrease in the abundance of their closely related species, suggesting an important role of interspecific competition in driving the observed community divergence. Our results also suggested a lack of effective population regulations to force the relative abundance of manipulated species to revert to original level, which would allow persistence of the divergence among soil bacterial communities. We concluded that biotic interactions were important in determining soil bacterial community composition, which could result in substantial variation in soil bacterial community composition in abiotically homogenous environment.
机译：众所周知，环境异质性和分散是确定土壤细菌群落组成的关键因素，但是关于局部生物相互作用的作用很少。在这里，我们通过在半干旱草原上进行的丰富操纵实验来解决这个问题。我们手动增加了分开，封闭，社区的六种随机选择的居民细菌种类的丰富，并允许社区以原地恢复1年。伴随着不同物种丰富的繁殖中的单一集中伴随着物种的群落分歧，伴随着局部多样性的下降。六种添加物种中有四种导致其密切相关的物种的丰富降低，这表明三种竞争在推动观察到的社区分歧方面的重要作用。我们的结果还提出缺乏有效的人口法规，以迫使操纵物种恢复到原始水平的相对丰富，这将允许土壤细菌社区的分歧持续存在。我们得出结论，生物相互作用在确定土壤细菌群落组合物方面是重要的，这可能导致无生物均匀环境中的土壤细菌群落组成的实质性变化。

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