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, Steven D Mamet Department of Soil Science, University of Saskatchewan , Saskatoon, Saskatchewan, Canada Search for other works by this author on: Oxford Academic Eric G Lamb Department of Plant Science, University of Saskatchewan , Saskatoon, Saskatchewan, Canada Search for other works by this author on: Oxford Academic Candace L Piper Department of Plant Science, University of Saskatchewan , Saskatoon, Saskatchewan, Canada Search for other works by this author on: Oxford Academic Tristrom Winsley Department of Soil Science, University of Saskatchewan , Saskatoon, Saskatchewan, Canada Search for other works by this author on: Oxford Academic Steven D Siciliano Department of Soil Science, University of Saskatchewan , Saskatoon, Saskatchewan, Canada Correspondence: SD Siciliano, Department of Soil Science, University of Saskatchewan, 51 Campus Drive, Saskatoon, Saskatchewan, S7N 5A8, Canada. E-mail: steven.siciliano@usask.ca Search for other works by this author on: Oxford Academic
https://orcid.org/0000-0002-3510-3814 The ISME Journal, Volume 11, Issue 5, May 2017, Pages 1261–1275, https://doi.org/10.1038/ismej.2016.205
Published:
31 January 2017
Article history
Received:
04 October 2016
Revision received:
16 November 2016
Accepted:
15 December 2016
Published:
31 January 2017
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Steven D Mamet, Eric G Lamb, Candace L Piper, Tristrom Winsley, Steven D Siciliano, Archaea and bacteria mediate the effects of native species root loss on fungi during plant invasion, The ISME Journal, Volume 11, Issue 5, May 2017, Pages 1261–1275, https://doi.org/10.1038/ismej.2016.205
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Abstract
Although invasive plants can drive ecosystem change, little is known about the directional nature of belowground interactions between invasive plants, native roots, bacteria, archaea and fungi. We used detailed bioinformatics and a recently developed root assay on soils collected in fescue grassland along a gradient of smooth brome (Bromus inermis Leyss) invasion to examine the links between smooth brome shoot litter and root, archaea, bacteria and fungal communities. We examined (1) aboveground versus belowground influences of smooth brome on soil microbial communities, (2) the importance of direct versus microbe-mediated impacts of plants on soil fungal communities, and (3) the web of roots, shoots, archaea, bacteria and fungi interactions across the A and B soil horizons in invaded and non-invaded sites. Archaea and bacteria influenced fungal composition, but not vice versa, as indicated by redundancy analyses. Co-inertia analyses suggested that bacterial–fungal variance was driven primarily by 12 bacterial operational taxonomic units (OTUs). Brome increased bacterial diversity via smooth brome litter in the A horizon and roots in the B horizon, which then reduced fungal diversity. Archaea increased abundance of several bacterial OTUs, and the key bacterial OTUs mediated changes in the fungi’s response to invasion. Overall, native root diversity loss and bacterial mediation were more important drivers of fungal composition than were the direct effects of increases in smooth brome. Critically, native plant species displacement and root loss appeared to be the most important driver of fungal composition during invasion. This causal web likely gives rise to the plant–fungi feedbacks, which are an essential factor determining plant diversity in invaded grassland ecosystems.
© International Society for Microbial Ecology 2017
This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (https://academic.oup.com/pages/standard-publication-reuse-rights)
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