Ecological interactions are evolutionarily conserved,indicating a tendency of closely related species to interact with similar partners.Arbuscular mycorrhizal(AM)fungi form obligate symbioses with the roots of most la...Ecological interactions are evolutionarily conserved,indicating a tendency of closely related species to interact with similar partners.Arbuscular mycorrhizal(AM)fungi form obligate symbioses with the roots of most land plants.Local host preference is frequently reported as a factor in structuring AM fungal communities.There lacks study about whether AM fungi-host preference could structure AM fungal communities at the regional scales.Here,AM fungal communities of 296 root samples were revealed,encompassing 76 plant species from 29 plant families,which were sampled in steppe in the Xilingol Grassland in northern China.The relative importance of plant phylogeny,geographical distance,and environmental variables were characterized on phylogenetic turnover of AM fungal communities with GLMM-MCMC(the generalized linear mixed model using Markov chain Monte Carlo)and Mantel test approaches.Geographic distance appeared to be more important to the phylogenetic turnover of AM fungal communities than plant phylogeny and environmental variables,evidencing the role of dispersal limitation in shaping the root AM fungal communities.A great majority of phylogenetic beta diversity(betaNTI and betaNRI)is distributed between−2 and+2,which also suggested a random pattern of AM fungal communities.Here,empirical evidence supporting that dispersal limitation is the main determinant of AM fungal communities at the landscape scale is provided and it is suggested that AM fungal communities are mainly structured by stochastic events.展开更多
基金supported by the Central Public-interest Scientific Institution Basal Research Fund(CAFYBB2019QB001,CAFYBB2020ZB001)the Natural Science Foundation of China(Grant No.31870099)the Strategic Priority Research Program of Chinese Academy of Sciences(XDA26020102).
文摘Ecological interactions are evolutionarily conserved,indicating a tendency of closely related species to interact with similar partners.Arbuscular mycorrhizal(AM)fungi form obligate symbioses with the roots of most land plants.Local host preference is frequently reported as a factor in structuring AM fungal communities.There lacks study about whether AM fungi-host preference could structure AM fungal communities at the regional scales.Here,AM fungal communities of 296 root samples were revealed,encompassing 76 plant species from 29 plant families,which were sampled in steppe in the Xilingol Grassland in northern China.The relative importance of plant phylogeny,geographical distance,and environmental variables were characterized on phylogenetic turnover of AM fungal communities with GLMM-MCMC(the generalized linear mixed model using Markov chain Monte Carlo)and Mantel test approaches.Geographic distance appeared to be more important to the phylogenetic turnover of AM fungal communities than plant phylogeny and environmental variables,evidencing the role of dispersal limitation in shaping the root AM fungal communities.A great majority of phylogenetic beta diversity(betaNTI and betaNRI)is distributed between−2 and+2,which also suggested a random pattern of AM fungal communities.Here,empirical evidence supporting that dispersal limitation is the main determinant of AM fungal communities at the landscape scale is provided and it is suggested that AM fungal communities are mainly structured by stochastic events.
