Abstract
Although the consequences of changes in microbial diversity have received increasing attention, our understanding of processes that drive spatial variation in microbial diversity remains limited. In this study, we sampled bacterial communities in early and late successional temperate forests in Northeast China, and used distance-based redundancy analysis to examine how different processes influence bacterial beta diversity and phylogeny-based beta diversity using the Bray–Curtis and UniFrac metrics, respectively. After controlling for sampling effects, bacterial beta diversity in both forests was higher than expected by chance, which indicates that the bacterial community showed strong intraspecific aggregation. Both environmental filtering and dispersal limitation contributed to bacterial beta diversity and phylogeny-based beta diversity in the two forests. However, the relative importance of these different processes varied between the two forests. In the early successional forest, dispersal limitation played a dominant role in structuring the bacterial community, whereas the effects of environmental filtering were more important in the late successional forest. Our study revealed that bacterial beta diversity and phylogeny-based beta diversity in forest communities from the same region are regulated by different forces and that the relative importance of different forces varies over succession.
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Acknowledgments
This work was supported by the “China Soil Microbiome Initiative: Function and Regulation of Soil-Microbial Systems” of the Chinese Academy of Sciences (XDB15010302), National Natural Science and Foundation of China (31370444), and State Key Laboratory of Forest and Soil Ecology (LFSE2013-11 and LFSE2013-14). T.M. Bezemer was supported by Chinese Academy of Sciences Visiting Professorship for Senior International Scientists (2013T1Z0014). We thank Prof. Pierre Legendre for valuable comments about statistical analyses, Jianjun Wang for helpful comments on the manuscript, our field crew from the Changbai Mountain National Station of Forest Ecosystem Observation and Research for help with collecting the soil cores, and Dr. Suresh Iyer, Dr. Matthew Settles, and the other researchers from the Institute for Bioinformatics and Evolutionary Studies (IBEST), University of Idaho, USA for technical assistance with 454 pyrosequencing analysis.
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Wang, X., Li, H., Bezemer, T.M. et al. Drivers of bacterial beta diversity in two temperate forests. Ecol Res 31, 57–64 (2016). https://doi.org/10.1007/s11284-015-1313-z
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DOI: https://doi.org/10.1007/s11284-015-1313-z