Abstract
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.
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Acknowledgements
We thank Lin Jiang, Shaopeng Li, Jiaqi Tan, Xian Yang, and two anonymous referees for comments that improved earlier versions of this paper. This work was funded by the National Natural Science Foundation of China (31725006 and 31670376) to QGZ. DYZ was supported by National Natural Science Foundation of China (31421063).
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Zhao, XF., Hao, YQ., Zhang, DY. et al. Local biotic interactions drive species-specific divergence in soil bacterial communities. ISME J 13, 2846–2855 (2019). https://doi.org/10.1038/s41396-019-0477-x
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DOI: https://doi.org/10.1038/s41396-019-0477-x
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