title: Contrasting diversity patterns of crenarchaeal, bacterial and fungal soil communities in an alpine landscape.
abstract: BACKGROUND
  The advent of molecular techniques in microbial ecology has aroused interest in gaining an understanding about the spatial distribution of regional pools of soil microbes and the main drivers responsible of these spatial patterns. Here, we assessed the distribution of crenarcheal, bacterial and fungal communities in an alpine landscape displaying high turnover in plant species over short distances. Our aim is to determine the relative contribution of plant species composition, environmental conditions, and geographic isolation on microbial community distribution.
  
  
  RESULTS
  Eleven types of habitats that best represent the landscape heterogeneity were investigated. Crenarchaeal, bacterial and fungal communities were described by means of Single Strand Conformation Polymorphism. Relationships between microbial beta diversity patterns were examined by using Bray-Curtis dissimilarities and Principal Coordinate Analyses. Distance-based redundancy analyses and variation partitioning were used to estimate the relative contributions of different drivers on microbial beta diversity. Microbial communities tended to be habitat-specific and did not display significant spatial autocorrelation. Microbial beta diversity correlated with soil pH. Fungal beta-diversity was mainly related to soil organic matter. Though the effect of plant species composition was significant for all microbial groups, it was much stronger for Fungi. In contrast, geographic distances did not have any effect on microbial beta diversity.
  
  
  CONCLUSIONS
  Microbial communities exhibit non-random spatial patterns of diversity in alpine landscapes. Crenarcheal, bacterial and fungal community turnover is high and associated with plant species composition through different set of soil variables, but is not caused by geographical isolation.
authors: Laboratoire d'Ecologie Alpine, CNRS-UMR 5553, Université de Grenoble, Grenoble, France. lucie@zinger.fr
authors: Lucie
authors: L
authors: Zinger
authors: David P H
authors: DP
authors: Lejon
authors: Florence
authors: F
authors: Baptist
authors: Abderrahim
authors: A
authors: Bouasria
authors: Serge
authors: S
authors: Aubert
authors: Roberto A
authors: RA
authors: Geremia
authors: Philippe
authors: P
authors: Choler
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