title: Plant species distributions along environmental gradients: do belowground interactions with fungi matter?
abstract: The distribution of plants along environmental gradients is constrained by abiotic and biotic factors. Cumulative evidence attests of the impact of biotic factors on plant distributions, but only few studies discuss the role of belowground communities. Soil fungi, in particular, are thought to play an important role in how plant species assemble locally into communities. We first review existing evidence, and then test the effect of the number of soil fungal operational taxonomic units (OTUs) on plant species distributions using a recently collected dataset of plant and metagenomic information on soil fungi in the Western Swiss Alps. Using species distribution models (SDMs), we investigated whether the distribution of individual plant species is correlated to the number of OTUs of two important soil fungal classes known to interact with plants: the Glomeromycetes, that are obligatory symbionts of plants, and the Agaricomycetes, that may be facultative plant symbionts, pathogens, or wood decayers. We show that including the fungal richness information in the models of plant species distributions improves predictive accuracy. Number of fungal OTUs is especially correlated to the distribution of high elevation plant species. We suggest that high elevation soil show greater variation in fungal assemblages that may in turn impact plant turnover among communities. We finally discuss how to move beyond correlative analyses, through the design of field experiments manipulating plant and fungal communities along environmental gradients.
authors: Department of Ecology and Evolution, University of Lausanne Lausanne, Switzerland.
authors: Loïc
authors: L
authors: Pellissier
authors: Eric
authors: E
authors: Pinto-Figueroa
authors: Hélène
authors: H
authors: Niculita-Hirzel
authors: Mari
authors: M
authors: Moora
authors: Lucas
authors: L
authors: Villard
authors: Jérome
authors: J
authors: Goudet
authors: Nicolas
authors: N
authors: Guex
authors: Marco
authors: M
authors: Pagni
authors: Ioannis
authors: I
authors: Xenarios
authors: Ian
authors: I
authors: Sanders
authors: Antoine
authors: A
authors: Guisan
keywords: 454 pyrosequencing; elevation; fungal communities; plant assemblage; species distribution models