Repeated selective enrichment process of sediment microbiota occurred in sea cucumber guts

Yohei Yamazaki, Yuichi Sakai, Sayaka Mino, Wataru Suda, Masahira Hattori, Pedro Milet Meirelles, Fabiano Thompson, Tomoo Sawabe*


研究成果: Article査読

11 被引用数 (Scopus)


Deposit-feeding sea cucumbers repeat ingestion of sediments and excretion of faeces daily and consequently increase bacterial abundance in sediments and promote organic matter mineralization. Such ecological roles are expected to be collaborative activities of sea cucumbers and the gut microbiota. Here, we performed a spatiotemporally broad 16S rRNA gene analysis using 109 samples from sea cucumber faeces and habitat sediments to explore potential contribution of their gut microbiota to the ecological roles. Most operational taxonomic units (OTUs) observed in the faecal samples were shared with the sediment samples, nevertheless faecal and sediment microbiota differed from each other in UniFrac analysis. Lower bacterial diversity and increased relative abundance of specific OTUs in the faecal microbiota strongly suggest selective enrichment of ingested sediment microbiota in their guts. Interestingly, representative faecal OTUs were more abundant in sea cucumber-populated sediments than in un-inhabited sediments, indicating bacteria selectively enriched in the guts were spread on ambient sediments via faeces. Moreover, the predicted microbial community metabolic potential showed a higher abundance of genes related to carbohydrate and xenobiotics metabolisms in faeces than in sediments. Our study suggests the repeated selective enrichment transforms ambient sediment microbial communities and maintains the host's ecological roles by promoting organic matter mineralization.

ジャーナルEnvironmental Microbiology Reports
出版ステータスAccepted/In press - 2019 1月 1

ASJC Scopus subject areas

  • 生態、進化、行動および分類学
  • 農業および生物科学(その他)


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