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Stochasticity dominates assembly processes of soil nematode metacommunities on three Asian mountains

Pedosphere 2023年第2期33卷 331-342页

作者： Shuqi ZOU Jonathan ADAMS Zhi YU Nan LI Dorsaf KERFAHI Binu TRIPATHI Changbae LEE Teng YANG itumeleng moroenyane Xing CHEN Jinsoo KIM Hyun Jeong KWAK Matthew Chidozie OGWU Sang-Seob LEE Ke DONG Department of Integrative Biotechnology Sungkyunkwan University300 Chuncheon-DongSuwon 16419(Korea) School of Geographic and Oceanographic Sciences Nanjing UniversityNanjing 210008(China) Key laboratory of Ministry of Education for Environment Change and Resources Use in Beibu Gulf Guangxi Key Laboratory of Earth Surface Processes and Intelligent SimulationNanning Normal University175 East Mingxiu RoadNanning 530001(China) School of Natural Sciences Department of Biological SciencesKeimyung UniversityDaegu 42601(Korea) Korea Polar Research Institute Incheon 21990(Korea) Department of Forestry Environment and SystemsKookmin UniversitySeoul 02707(Korea) State Key Laboratory of Soil and Sustainable Agriculture Institute of Soil ScienceChinese Academy of Sciences71 East Beijing RoadNanjing 210008(China) Institut National Recherche Scientifique Institut Armand-Frappier SantéBiotechnologie531 Boulevard des PrairiesLaval H7V1B7(Canada) College of Life Science and Technology Guangxi University100 Daxue RoadNanning 530004(China) Department of Biological Sciences Kyonggi University154-42 Gwanggyosan-roYeongtong-guSuwon-siGyeonggi-do 16227(Korea) School of Biological Sciences Seoul National University1 Gwanak-roSeoul 08826(Korea)

Nematodes play an important role in ecosystems;however,very little is known about their assembly processes and the factors influencing them.We studied nematode communities in bulk soils from three Asian mountain ecosystems to determine the assembly processes of free-living nematode metacommunities and their driving factors.On each mountain,elevations span a range of climatic conditions with the potential to reveal assembly processes that predominate across multiple biomes.A phylogenetic null modeling framework was used to analyze 18S rRNA gene amplicons to quantify various assembly processes.We found that phylogenetic turnover between nematode communities on all mountains was dominated by stochastic processes,with“undominated processes”being the most predominant stochastic factor.Elevation has a significant impact on the relative importance of deterministic and stochastic processes.A variety of climatic and edaphic variables significantly influenced the variations in community assembly processes with elevation,even though their impacts were not consistent between the mountains.Overall,our results indicate that free-living nematode metacommunities in a wide range of environments are largely structured by stochastic processes rather than by niche-based deterministic processes,suggesting that metacommunities of soil free-living nematodes may respond to climate change in a largely unpredictable way.

关键词： climate change ecological drift elevation gradient environmental stress stochastic process

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