Successional dynamics of taxonomic structure and potential functions of soil microbial communities along the gradient of deglaciation in polar regions

• Main Author: 경혜련
• Other Authors: 이은주, Hyeryeon Gyeong, 자연과학대학 생명과학부
• Format: Doctoral or Postdoctoral Thesis
• Language: English
• Published: 서울대학교 대학원 2022
• Subjects: Glacierforeland; microbialsuccession; microbialecology; dissolvedorganicmatter; andthepolarregions; 570; Arctic; Fourcade; Fourcade Glacier; Antarc*; Antarctica
• Online Access: https://hdl.handle.net/10371/188563; https://dcollection.snu.ac.kr/common/orgView/000000172770

학위논문(박사) -- 서울대학교대학원 : 자연과학대학 생명과학부, 2022. 8. 이은주. Glacier forelands have long fascinated ecologists and soil scientists by providing ideal places to study the patterns and processes of ecological succession. Previous studies on ecological succession in glacier forelands have focused mainly on the vegetation development or pedogenesis, but relatively less attention has been paid to microbial succession, especially in polar regions such as the High Arctic and Antarctica. In addition, former studies on microbial succession have typically focused on a single taxonomic group and often lack the examination on chemical turnover of organic substrates corresponding to biological turnover, resulting in a limited understanding of microbial succession in glacier forelands. In order to get a comprehensive understanding of microbial succession in glacier forelands of polar regions, this thesis aimed to investigate the successional changes of microbial communities in both the biological aspects (e.g., taxonomic compositions, functional profiles, and interactions between microbial groups) and the chemical aspects (e.g., diversity and compositional changes of dissolved organic matters). To acquire the knowledge on microbial community succession at the very early successional stages prior to plant colonization, the successional dynamics and assembly processes of bacterial and fungal communities were compared along a soil age gradient of 10 years on the Fourcade glacier foreland. Bacterial and fungal communities in recently deglaciated soils are largely decoupled from each other during succession and exert very divergent trajectories of succession and assembly under different selective forces. In addition to the study on successional patterns of microbial communities in unvegetated glacier forelands, the compositional changes of four different microbial communities (bacteria, fungi, protists, and archaea) and their interactions were investigated to gain a holistic view of microbial succession on a glacier foreland of the High ...