1. Microbial Processes Forming Daily Lamination in an Aragonite Travertine, Nagano-yu Hot Spring, Southwest Japan
- Author
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Hiroko Koike, Tomoyo Okumura, Chizuru Takashima, Shin Nishida, Takeshi Naganuma, Fumito Shiraishi, Gernot Arp, Kise Yukimura, and Akihiro Kano
- Subjects
010506 paleontology ,Honshu ,Mineralogy ,Lamination (topology) ,engineering.material ,Cyanobacteria ,010502 geochemistry & geophysics ,aragonite ,microbial activity ,01 natural sciences ,Microbiology ,Nagano ,Citrus maxima ,Extracellular polymeric substance ,Japan ,cyanobacterium ,Daily lamination ,travertine ,lamination ,Earth and Planetary Sciences (miscellaneous) ,Hydrogenophaga ,Environmental Chemistry ,stromatolite ,0105 earth and related environmental sciences ,General Environmental Science ,Hot spring ,biology ,Aragonite ,Biofilm ,biology.organism_classification ,Hydrogenophaga sp ,thermal spring ,Light intensity ,Stromatolite ,Aragonite travertine ,Chubu ,Environmental chemistry ,engineering ,Geology - Abstract
An aragonite travertine at Nagano-yu hot spring, SW Japan, exhibits clear sub-millimeter-order lamination that resembles ancient ministromatolites. Thirty-three hours of continuous observation showed that the lamination is formed daily with no changes in physicochemical properties except light intensity. Phylotype analysis and fluorescence in situ hybridization indicate that Hydrogenophaga sp. is dominant and concentrated in diurnal layers containing abundant extracellular polymeric substances. Growth of Hydrogenophaga sp. is activated in the daytime, likely due to extracellular polymeric substance production by cyanobacterial photosynthesis. Daytime development of Hydrogenophaga-dominant biofilms, and the concurrent inhibiting effect on aragonite precipitation, explains the daily lamination observed.
- Published
- 2011