Abstract
Arbuscular mycorrhizal fungi (AMF) are crucial to plants and vice versa, but little is known about the factors linking the community structure of the two groups. We investigated the association between AMF and the plant community structure in the nearest neighborhood of Festuca brevipila in a semiarid grassland with steep environmental gradients, using high-throughput sequencing of the Glomeromycotina (former Glomeromycota). We focused on the Passenger, Driver and Habitat hypotheses: (i) plant communities drive AMF (passenger); (ii) AMF communities drive the plants (driver); (iii) the environment shapes both communities causing covariation. The null hypothesis is that the two assemblages are independent and this study offers a spatially explicit novel test of it in the field at multiple, small scales. The AMF community consisted of 71 operational taxonomic units, the plant community of 47 species. Spatial distance and spatial variation in the environment were the main determinants of the AMF community. The structure of the plant community around the focal plant was a poor predictor of AMF communities, also in terms of phylogenetic community structure. Some evidence supports the passenger hypothesis, but the relative roles of the factors structuring the two groups clearly differed, leading to an apparent decoupling of the two assemblages at the relatively small scale of this study. Community phylogenetic structure in AMF suggests an important role of within-assemblage interactions.
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Acknowledgements
SH and TC acknowledge funding by the German science foundation (DFG Grant No. CA 987/1-1). TC was also supported by the project SENSE (Structure and Ecological Niche in the Soil Environment; EC FP7—631399—SENSE). We are grateful to four anonymous reviewers for their invaluable comments and suggestions, which have improved the quality of this work. Support during the 454 sequencing by the Göttingen Genomics Laboratory is gratefully acknowledged.
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Horn, S., Hempel, S., Verbruggen, E. et al. Linking the community structure of arbuscular mycorrhizal fungi and plants: a story of interdependence?. ISME J 11, 1400–1411 (2017). https://doi.org/10.1038/ismej.2017.5
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DOI: https://doi.org/10.1038/ismej.2017.5
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