Diversity and Function of Epibiotic Microbial Communities on the Galatheid Crab, Shinkaia crosnieri

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The galatheid crab, Shinkaia crosnieri (Decapoda: Galatheidae), forms dense colonies in the Iheya North and Hatoma Knoll deep-sea hydrothermal fields and has numerous setae covered with filamentous epibiotic microorganisms. Molecular phylogenetic analyses revealed that the epibiotic communities in S. crosnieri consisted mainly of yet-uncultivated phylotypes within Epsilonproteobacteria and Gammaproteobacteria in both hydrothermal vent fields. Uptake experiments using 13C-labeled tracers clearly demonstrated that both H13CO3- and 13CH4 were assimilated into not only the epibiotic microbial communities associated with the setae, but also the epibiont-free tissue of living S. crosnieri. In addition, the incorporation of H13CO3- into the microbial cells was strongly stimulated by the presence of reduced sulfur compounds but not by H2. In conclusion, the uptake experiments suggested that sulfur-oxidizing chemolithoautotrophic and methanotrophic production by the epibionts provides the nutrition for S. crosnieri.
日本微生物生態学会・日本土壌微生物学会の論文