EGU23-17542, updated on 08 Jan 2024
EGU General Assembly 2023
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.

Benthic microbial community structure and ecological functions along the salinity gradient in the East Siberian Sea

Yung Mi Lee1, Yerin Park1,2, Dong-Hun Lee3, Binu Mani Tripathi1, Ji-Hoon Kim4, Yeonjin Choi1, Chung Yeon Hwang2, Young Keun Jin1, and Jong Kuk Hong1
Yung Mi Lee et al.
  • 1Korea Polar Research Institute, 26 Songdomirae-ro, Yeonsu-gu, Incheon 21990, Republic of Korea
  • 22ScSchool of Earth and Environmental Sciences and Research Institute of Oceanography, Seoul National University, Seoul 08826, Republic of Korea
  • 3Marine Environment Research Division, National Institute of Fisheries Science, Busan 46083, Republic of Korea
  • 4Korea Institute of Geoscience and Mineral Resources, 124 Gwahang-no Yuseong-gu, Daejeon 34312, Republic of Korea

The rising temperature in the Arctic changes marine environments such as sea ice fluctuation, primary production, and riverine input and these changes, in turn, impact on benthic ecosystems. East Siberian Sea (ESS) represents shallow shelf seas with three to seven times higher river discharge than other seas of Russian Arctic. However, studies on the microbial composition and functions according to the environmental parameters have not been performed in the ESS. In this study, the benthic microbial community structure with the environmental parameters and their ecological functions were investigated. Bacterial community was dominated by the phyla Proteobacteia (51.1±6.6%) followed by Bacteroidetes (16.4±9.5%), Planctomycetes (8.9±3.8%), Acidobacteria (6.5±4.2%), Actinobacteria (2.6±2.0%). In the archaeal community, Thaumarchaeota (70.9±11.1%) and Euryarchaeota (27.7±11.4%) were predominant. There are some microbial taxa showing significant changing pattern along the latitude. The proportion of Alphaproteobacteria and Acidobacteria increased while that of Bacteroidetes and Deltaproteobacteria and Thaumarchaeota decreased along the latitude. Microbial community composition and function of major taxa were clearly differentiated according to the latitude and concurrent environmental parameters such as salinity and concentration of ammonium and sulfate. In addition, the function of major microbial taxa including ammonium oxidation and sulfate reduction inferred from 16S rRNA identity also changed across the salinity gradient. These results imply that environmental changes in the benthic ecosystems accelerated from the climate change may impact a significant change on benthic microbial community composition and their functions.

How to cite: Lee, Y. M., Park, Y., Lee, D.-H., Tripathi, B. M., Kim, J.-H., Choi, Y., Hwang, C. Y., Jin, Y. K., and Hong, J. K.: Benthic microbial community structure and ecological functions along the salinity gradient in the East Siberian Sea, EGU General Assembly 2023, Vienna, Austria, 23–28 Apr 2023, EGU23-17542,, 2023.