Rock surface structures affect the microbial community in a river

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  • KUNIYASU Rinako
    Laboratory of Microbial Ecology, Tokyo University of Agriculture and Technology
  • MORIKAWA Kazuko
    Laboratory of Microbial Ecology, Tokyo University of Agriculture and Technology

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  • 河床における礫の表面構造と付着微生物群集
  • カショウ ニ オケル レキ ノ ヒョウメン コウゾウ ト フチャク ビセイブツ グンシュウ

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Abstract

The microbial community detected in the biofilm of two types of riverbed stone, mudstone and sandstone, were compared for bacterial community composition and LV-SEM observation. The surface microbial community of each type of stone was divided into three fractions by ultrasonic treatment, and we obtained bacterial strains from each fraction. Those strains were examined and compared for their physiological characteristics. The bacterial community composition of each fraction differed in both kinds of substrate stones. Especially, the bacterial community in the crack of sandstone had similar bacterial strains that were seemed to flourish in that crack. It was suggested that the pioneer of the microbial community on the river bed stones was determined by the crack size of the surface structure of the substrate stones.

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