1. 1Division of Polar Life Sciences, Korea Polar Research Institute, Incheon 21990, Republic of Korea
2. 2Microbial Oceanography Laboratory, School of Earth and Environmental Sciences and Research Institute of Oceanography, Seoul National University, Seoul 08826, Republic of Korea
3. 3Division of Polar Paleoenvironment, Korea Polar Research Institute, Incheon 21990, Republic of Korea