4.1 Article

Diversity and Composition of Microbial Communities in an Eelgrass (Zostera marina) Bed in Tokyo Bay, Japan

期刊

MICROBES AND ENVIRONMENTS
卷 36, 期 4, 页码 -

出版社

JAPANESE SOC MICROBIAL ECOLOGY, DEPT BIORESOURCE SCIENCE
DOI: 10.1264/jsme2.ME21037

关键词

Zostera marina; 16S rRNA; eelgrass microbiome; dead leaf; Tokyo Bay

资金

  1. JSPS Kakenhi [18H04136]
  2. Environment Research and Technology Development Fund (ERTDF) [S-9]
  3. Ministry of the Environment, Japan
  4. Grants-in-Aid for Scientific Research [18H04136] Funding Source: KAKEN

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The study investigated the microbial consortia of Zostera marina at Futtsu clam-digging beach in Chiba prefecture, Japan. The research found that bacterial taxa in eelgrass leaves and surrounding seawater differed from those in sediment and withered leaves, suggesting a unique microbial composition in different parts of the seagrass bed.
Zostera marina (eelgrass) is a widespread seagrass species that forms diverse and productive habitats along coast lines throughout much of the northern hemisphere. The present study investigated the microbial consortia of Z. marina growing at Futtsu clam-digging beach, Chiba prefecture, Japan. The following environmental samples were collected: sediment, seawater, plant leaves, and the root-rhizome. Sediment and seawater samples were obtained from three sampling points: inside, outside, and at the marginal point of the eelgrass bed. The microbial composition of each sample was analyzed using 16S ribosomal gene amplicon sequencing. Microbial communities on the dead (withered) leaf surface markedly differed from those in sediment, but were similar to those in seawater. Eelgrass leaves and surrounding seawater were dominated by the bacterial taxa Rhodobacterales (Alphaproteobacteria), whereas Rhodobacterales were a minor group in eelgrass sediment. Additionally, we speculated that the order Sphingomonadales (Alphaproteobacteria) acts as a major degrader during the decomposition process and constantly degrades eelgrass leaves, which then spread into the surrounding seawater. Withered eelgrass leaves did not accumulate on the surface sediment because they were transported out of the eelgrass bed by wind and residual currents unique to the central part of Tokyo Bay.

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