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Local-scale variation of soil bacterial communities in ice-free regions of maritime Antarctica

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Title
Local-scale variation of soil bacterial communities in ice-free regions of maritime Antarctica
Other Titles
남극 바톤반도에서의 국지적 규모의 토양미생물의 공간분포 연구
Authors
Kim, Mincheol
Lim, Hyun-Soo
Hyun, Chang-Uk
Cho, Ahnna
Noh, Hyun-Ju
Hong, Soon Gyu
Kim, Ok-Sun
Keywords
Antarctic terrestrial ecosystem; microbial biogeography; soil bacterial community
Issue Date
2019-03
Citation
Kim, Mincheol, et al. 2019. "Local-scale variation of soil bacterial communities in ice-free regions of maritime Antarctica". SOIL BIOLOGY & BIOCHEMISTRY, 133(0): 165-173.
Abstract
The majority of biogeographic studies in Antarctic terrestrial ecosystems have focused on macroscopic eukaryote taxa. In contrast, microbial taxa have been almost neglected or examined without sufficient spatial coverage. Here, we examined the spatial distribution of soil bacterial communities and their relation to local environmental gradients in ice-free regions of the maritime Antarctic. Soils in this region were dominated by Actinobacteria and Proteobacteria, which are typically found in Antarctic soils. Notably, candidate divisions AD3 and WPS-2, which rarely occur in other biomes, were found in high abundance in acidic surface soils. Soil pH and total organic carbon (TOC) were the primary drivers of the bacterial community structure and various geochemical variables also played important roles in structuring bacterial community composition. Bacterial communities were significantly correlated to measured environmental variables, most of which are spatially structured at the local spatial scale (0.5?8 km). This suggests that spatial heterogeneity of environmental factors is an important driver of shifts in bacterial communities. Although various sets of environmental variables were related to bacterial communities, a large proportion of community variation remained unexplained. This indicates that bacterial communities in Antarctic soils may be governed by other biotic or abiotic factors which are not typically measured in other biome studies.
URI
http://repository.kopri.re.kr/handle/201206/9646
DOI
http://dx.doi.org/10.1016/j.soilbio.2019.03.011
ISSN
0038-0717
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