Geographical variation in soil bacterial community structure in tropical forests in Southeast Asia and temperate forests in Japan based on pyrosequencing analysis of 16S rRNA

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  • Ito Natsumi
    Laboratory of Plant Genetics, Graduate School of Agriculture, Kyoto University
  • Iwanaga Hiroko
    Laboratory of Plant Genetics, Graduate School of Agriculture, Kyoto University
  • Charles Suliana
    Sarawak Forestry Corporation
  • Diway Bibian
    Sarawak Forestry Corporation
  • Sabang John
    Sarawak Forestry Corporation
  • Chong Lucy
    Sarawak Forestry Corporation
  • Nanami Satoshi
    Laboratory of Plant Ecology, Graduate School of Science, Osaka City University
  • Kamiya Koichi
    Department of Forest Resources, Faculty of Agriculture, Ehime University
  • Lum Shawn
    Department of Natural Sciences and Science Education, National Institute of Education, Nanyang Technological University
  • Siregar Ulfah J.
    Faculty of Forestry, Bogor Agricultural University and Southeast Asian Regional Centre for Tropical Biology
  • Harada Ko
    Department of Forest Resources, Faculty of Agriculture, Ehime University
  • Miyashita Naohiko T.
    Laboratory of Plant Genetics, Graduate School of Agriculture, Kyoto University

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<p>Geographical variation in soil bacterial community structure in 26 tropical forests in Southeast Asia (Malaysia, Indonesia and Singapore) and two temperate forests in Japan was investigated to elucidate the environmental factors and mechanisms that influence biogeography of soil bacterial diversity and composition. Despite substantial environmental differences, bacterial phyla were represented in similar proportions, with Acidobacteria and Proteobacteria the dominant phyla in all forests except one mangrove forest in Sarawak, although highly significant heterogeneity in frequency of individual phyla was detected among forests. In contrast, species diversity (α-diversity) differed to a much greater extent, being nearly six-fold higher in the mangrove forest (Chao1 index = 6,862) than in forests in Singapore and Sarawak (~1,250). In addition, natural mixed dipterocarp forests had lower species diversity than acacia and oil palm plantations, indicating that aboveground tree composition does not influence soil bacterial diversity. Shannon and Chao1 indices were correlated positively, implying that skewed operational taxonomic unit (OTU) distribution was associated with the abundance of overall and rare (singleton) OTUs. No OTUs were represented in all 28 forests, and forest-specific OTUs accounted for over 70% of all detected OTUs. Forests that were geographically adjacent and/or of the same forest type had similar bacterial species composition, and a positive correlation was detected between species divergence (β-diversity) and direct distance between forests. Both α- and β-diversities were correlated with soil pH. These results suggest that soil bacterial communities in different forests evolve largely independently of each other and that soil bacterial communities adapt to their local environment, modulated by bacterial dispersal (distance effect) and forest type. Therefore, we conclude that the biogeography of soil bacteria communities described here is non-random, reflecting the influences of contemporary environmental factors and evolutionary history.</p>

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