https://repository.kopri.re.kr/handle/201206/4 2026-03-05T10:07:25Z 2026-03-05T10:07:25Z 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, Sangmin Shi, G. R. Woo, Jusun Park, Tae-Yoon S. Oh, Jae-Ryong Kim, Na Kyung Nakrem, Hans A. Tazawa, Jun-Ichi https://repository.kopri.re.kr/handle/201206/10980 2022-03-24T07:14:30Z 2019-11-01T00:00:00Z

Title: Permian spiriferellid brachiopods from northern Pangaea: taxonomy, biostratigraphy, macroevolution and implications for palaeoenvironmental and palaeobiogeographical reconstructions Authors: Lee, Sangmin; Shi, G. R.; Woo, Jusun; Park, Tae-Yoon S.; Oh, Jae-Ryong; Kim, Na Kyung; Nakrem, Hans A.; Tazawa, Jun-Ichi Abstract: This study reports diverse spiriferellid brachiopods from the Permian rocks of Svalbard and adjacent areas (Arctic Canada and Subpolar Urals of Russia) located at the northern margin of Pangaea. In total, 11 brachiopod species in four genera are recognized and described in detail, including two new species (Spiriferella protodraschei and Arcullina? enokiani). According to our taxonomic investigation, morphological characteristics of the ventral sulcus and dorsal fold are relatively stable within each species, in spite of considerable intraspecific variations in shell outline and macro-ornamentation. In addition, both the arrangement of pustules, as a shell surface micro-ornamentation, and the development of delthyrial coverings are shown to be significant features for inferring phylogenetic relationships and for defining species. The best-known but still questionable taxon, Spiriferella keilhavii, is here identified as an endemic species restricted to Bjørnøya and, possibly, to central East Greenland; it is phylogenetically closest to S. loveni. Following the taxonomic revision, the stratigraphical ranges of the spiriferellids within the Kapp Starostin Formation in Spitsbergen are fully refined: three species, S. protodraschei, A. polaris and Timaniella wilczeki, are confined to the lowermost Vøringen Member (late Artinskian？early Kungurian), whereas S. loveni dominates the overlying members with a much longer stratigraphical range (late Kungurian？Lopingian?). This abrupt compositional change, along with comparable changes in other taxonomic groups, can be explained by a palaeoclimatic shift from cool to cold conditions between the Vøringen Member and the overlying Svenskeegga member. A similar biotic transition is identified between the Hambergfjellet and Miseryfjellet formations in Bjørnøya. On the other hand, S. loveni is abundant in the Late Permian strata of central East Greenland, but there it appears to be more costate in plication compared to its counterpart from Spitsbergen. It is suggested that this alteration in shell ornamentation may represent a possible response (adaptation) to warming arising from the southward migration of the species.

2019-11-01T00:00:00Z 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