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- Title
Stochastic process determines the spatial variations in microbial community inhabiting terrestrial mud volcanoes across the Eurasian continent.
- Authors
Tu, Tzu-Hsuan; Chen, Li-Ling; Chiu, Yi-Ping; Lin, Li-Hung; Wu, Li-Wei; Italiano, Francesco; Shyu, J. Bruce H.; Raisossadat, Seyed Naser; Wang, Pei-Ling
- Abstract
Terrestrial mud volcanoes (MVs) represent the surface expression of conduits tapping fluid and gas reservoirs in the deep subsurface. Such plumbing channels provide a direct, effective means to extract deep microbial communities fueled by geologically produced gases and fluids. The drivers accounting for the diversity and composition of these MV microbial communities distributed over a wide geographic range remain elusive. This study characterized microbial communities of 15 terrestrial MVs across a distance of ~10,000 km of the Eurasian continent to test the validity of distance control and physiochemical factors in explaining biogeographic patterns. Our analyses yielded diverse community compositions with a total of 28,928 amplicon sequence variances taxonomically assigned to 73 phyla. Although no cosmopolitan member was found, community variance between geographic locations was higher than within sites, generating a slope of distance-decay relationship exceeding those for marine seeps and MVs, and seawater columns. For comparison, physiochemical parameters explained 12 % of community variance, and specific geochemical parameters were correlated with specific taxa. Overall, the apparent lack of fluid exchange renders terrestrial MVs a patchy habitat with microbiome comprising specific colonists that are highly adapted to the local environmental context and restricted in terms of dispersal capability.
- Subjects
MUD volcanoes; MICROBIAL communities; STOCHASTIC processes; SPATIAL variation; GAS reservoirs; GEOTHERMAL ecology; MICROBIAL diversity
- Publication
Biogeosciences Discussions, 2021, p1
- ISSN
1810-6277
- Publication type
Article
- DOI
10.5194/bg-2021-103