https://repository.kopri.re.kr/handle/201206/5304 2026-04-22T08:29:20Z 2026-04-22T08:29:20Z Choe, Yong-Hoe Lee, Yoo Kyung https://repository.kopri.re.kr/handle/201206/10404 2021-09-24T08:25:44Z 2019-12-01T00:00:00Z

Title: Analysis of lithic microbial communities Authors: Choe, Yong-Hoe; Lee, Yoo Kyung

2019-12-01T00:00:00Z Lee, Yoo Kyung https://repository.kopri.re.kr/handle/201206/11097 2022-03-24T07:14:35Z 2018-05-15T00:00:00Z

Title: Investigating terrestrial ecosystem changes in response to deglaciation in the Brogger peninsular Authors: Lee, Yoo Kyung

2018-05-15T00:00:00Z Choe, Yong-Hoe Lee, Yoo Kyung Lee, Eun Ju Lee, Jong Ik Lee, Mi Jung Woo, Jusun Kim, Mincheol https://repository.kopri.re.kr/handle/201206/9466 2022-03-24T07:11:52Z 2018-04-21T00:00:00Z

Title: Comparing Rock-inhabiting Microbial Communities in Different Rock Types from a High Arctic Polar Desert Authors: Choe, Yong-Hoe; Lee, Yoo Kyung; Lee, Eun Ju; Lee, Jong Ik; Lee, Mi Jung; Woo, Jusun; Kim, Mincheol Abstract: Although rocks are habitable places for microbes in extreme environments, microbial diversity in these lithic environments is still poorly understood. The diversity and abundance of rock-inhabiting microbial communities in different types of rock in Svalbard, Norwegian High Arctic were examined using NGS sequencing of the bacterial 16S rRNA gene and fungal 28S rRNA gene. The morphology of rock-inhabiting microorganisms in different rocks was documented using scanning electron microscopy.. Compositions of both bacterial and fungal communities varied across different rock types: sandstone, limestone, basalt, granite, and travertine. Bacterial communities were dominated by Actinobacteria, Proteobacteria, Chloroflexi, Bacteroidetes, and Acidobacteria. Fungal communities consisted of Eurotiomycetes, Lecanoromycetes, Dothideomycetes, and Leotiomycetes. These rock-inhabiting microbial communities were associated with the major elements contained in the mineral of rock samples. Bacterial communities were considerably correlated with the rock elements such as Mg and Ca. Fungal communities were considerably correlated with Fe. Interestingly, many dominant bacterial and fungal operational taxonomic units (OTUs) in the investigated rocks from the study area were closely affiliated to those found in other cold regions such as Alpine area, Arctic and Antarctica, suggesting that environmental constraints such as cold temperature may lead to convergence in microbial community composition. These results confirm that rocks in cold environments act as reservoirs of diverse bacteria and fungi, which may improve our understanding of lithic microbial ecology in the cold desert.

2018-04-21T00:00:00Z Binu, M. Lee, Yoo Kyung Jonathan Adams Dong Ke Kim, Mincheol James Stegen https://repository.kopri.re.kr/handle/201206/8561 2022-03-24T07:14:28Z 2018-01-01T00:00:00Z

Title: Soil pH mediates the balance between stochastic and deterministic assembly of bacteria Authors: Binu, M.; Lee, Yoo Kyung; Jonathan Adams; Dong Ke; Kim, Mincheol; James Stegen Abstract: Little is known about the factors affecting the relative influence of stochastic and deterministic processes that governs the assembly of microbial communities in successional soils. Here, we conducted a meta-analysis of bacterial communities using six different successional soils datasets, scattered across different regions, with different pH conditions in early and late successional soils. We found that extreme acidic or alkaline pH conditions lead to assembly of phylogenetically more clustered bacterial communities through deterministic processes, whereas pH conditions close to neutral lead to phylogenetically less clustered bacterial communities with more stochasticity. We suggest that the influence of pH, rather than successional age, is the main driving force in producing trends in phylogenetic assembly of bacteria, and that pH also influences the relative balance of stochastic and deterministic processes along successional soils. Given that pH had a much stronger association with community assembly than did successional age, we evaluated whether the inferred influence of pH was maintained when studying globally-distributed samples collected without regard for successional age. This dataset confirmed the strong influence of pH, suggesting that the influence of soil pH on community assembly processes occurs globally. Extreme pH conditions likely exert more stringent limits on survival and fitness, imposing strong selective pressures through ecological and evolutionary time. Taken together, these findings suggest that the degree to which stochastic vs. deterministic processes shape soil bacterial community assembly is a consequence of soil pH rather than successional age.

2018-01-01T00:00:00Z