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Shifts in taxonomic and functional structure of bacterial communities during a short-term succession in the High Arctic

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Title
Shifts in taxonomic and functional structure of bacterial communities during a short-term succession in the High Arctic
Other Titles
단기간 천이과정에서 관찰된 북극 토양 미생물 군집의 계통학적, 기능학적 구조 변화
Authors
Jung, Ji Young
Lee, Yoo Kyung
Kim, Mincheol
Keywords
bacterial succession; glacier retreat; rRNA copy number
Issue Date
2016
Citation
Jung, Ji Young, Lee, Yoo Kyung, Kim, Mincheol. 2016. Shifts in taxonomic and functional structure of bacterial communities during a short-term succession in the High Arctic. 22차 국제 극지과학 심포지엄. 극지연구소. 2016.05.10~2016.05.11.
Abstract
Primary succession after glacier retreat has been widely studied in plant communities, but bacterial succession is still poorly understood. Here, we investigated the shift in bacterial community structure and soil development along a 145-year old chronosequence in Austre Lovenbreen glacier foreland on Svalbard. Soil bacterial community was investigated via 16S rRNA gene pyrosequencing and potential metabolic functions were estimated using metagenome prediction. Time after glacier retreat played a key role in determining bacterial community structure and soil development during succession. However, environmental filtering (i.e. soil temperature) also accounted for the different but substantial proportion of taxonomic and functional structure of bacterial communities, which was not true for edaphic compositions. Using the functional trait-based approach, we found that average rRNA operon (rrn) copy number decreased over successional time and there is a strong positive relationship between rrn copy number and metabolic functional diversity. It suggests that bacteria rapidly responding to nutrient availability may have potential to adapt well to fluctuating environmental conditions by shifting cellular metabolism and physiology. These results demonstrate an importance role of soil temperature in bacterial community assembly and functioning in deglaciated forefields and trait-based studies have potential to predict the responses of microbial communities to environmental change by linking ecological strategies of soil microbes with ecosystem processes.
URI
http://repository.kopri.re.kr/handle/201206/8142
Conference Name
22차 국제 극지과학 심포지엄
Conference Place
극지연구소
Conference Date
2016.05.10~2016.05.11
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