Relative Importance of Individual Climatic Drivers Shaping Arbuscular Mycorrhizal Fungal Communities

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• 作者：Dan Xiang ; Stavros D. Veresoglou ; Matthias C. Rillig ; Tianle Xu…
• 刊名：Microbial Ecology
• 出版年：2016
• 出版时间：August 2016
• 年：2016
• 卷：72
• 期：2
• 页码：418-427
• 全文大小：631 KB
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Microbiology
  Ecology
  Geoecology and Natural Processes
  Nature Conservation
  
• 出版者：Springer New York
• ISSN：1432-184X
• 卷排序：72

文摘

The physiological tolerance hypothesis (PTH) postulates that it is the tolerance of species to climatic factors that determines overall community richness. Here, we tested whether a group of mutualistic microbes, Glomeromycota, is distributed in semi-arid environments in ways congruent with the PTH. For this purpose, we modeled with climatic predictors the niche of each of the four orders of Glomeromycota and identified predictors of arbuscular mycorrhizal (AM) fungal operational taxonomic unit (OTU) richness. Our dataset consisted of 50 paired grassland and farmland sites in the farming-pastoral ecotone of northern China. We observed shifts in the relative abundance of AM fungal orders in response to climatic variables but also declines in OTU richness in grassland sites that had experienced high precipitation during the preceding year which was incongruous with the PTH. We found pronounced differences across groups of Glomeromycotan fungi in their responses to climatic variables and identified strong dependencies of AM fungal communities on precipitation. Given that precipitation is expected to further decline in the farming-pastoral ecotone over the coming years and that mycorrhiza represents an integral constituent of ecosystem functioning, it is likely that the ecosystem services in the region will change accordingly.KeywordsArbuscular mycorrhizal fungiGrasslandsPhysiological tolerance hypothesisEcological niche modelingFarming-pastoral ecotone