Liu Yongqin, Priscu John C, Yao Tandong, Vick-Majors Trista J, Xu Baiqing, Jiao Nianzhi, Santibáñez Pamela, Huang Sijun, Wang Ninglian, Greenwood Mark, Michaud Alexander B, Kang Shichang, Wang Jianjun, Gao Qun, Yang Yunfeng
Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing, 100101, China.
CAS Center for Excellence in Tibetan Plateau Earth Sciences, Chinese Academy of Sciences, Beijing, 100101, China.
Environ Microbiol. 2016 Jun;18(6):1930-41. doi: 10.1111/1462-2920.13115. Epub 2015 Dec 10.
Climate change and anthropogenic factors can alter biodiversity and can lead to changes in community structure and function. Despite the potential impacts, no long-term records of climatic influences on microbial communities exist. The Tibetan Plateau is a highly sensitive region that is currently undergoing significant alteration resulting from both climate change and increased human activity. Ice cores from glaciers in this region serve as unique natural archives of bacterial abundance and community composition, and contain concomitant records of climate and environmental change. We report high-resolution profiles of bacterial density and community composition over the past half century in ice cores from three glaciers on the Tibetan Plateau. Statistical analysis showed that the bacterial community composition in the three ice cores converged starting in the 1990s. Changes in bacterial community composition were related to changing precipitation, increasing air temperature and anthropogenic activities in the vicinity of the plateau. Collectively, our ice core data on bacteria in concert with environmental and anthropogenic proxies indicate that the convergence of bacterial communities deposited on glaciers across a wide geographical area and situated in diverse habitat types was likely induced by climatic and anthropogenic drivers.
气候变化和人为因素会改变生物多样性，并可能导致群落结构和功能的变化。尽管存在潜在影响，但目前尚无关于气候对微生物群落影响的长期记录。青藏高原是一个高度敏感的地区，目前正因气候变化和人类活动增加而发生重大改变。该地区冰川的冰芯是细菌丰度和群落组成的独特自然档案，同时包含气候和环境变化的记录。我们报告了青藏高原上三条冰川冰芯中过去半个世纪细菌密度和群落组成的高分辨率剖面。统计分析表明，从20世纪90年代开始，三条冰芯中的细菌群落组成趋同。细菌群落组成的变化与降水量变化、气温升高以及高原附近的人为活动有关。总体而言，我们关于细菌的冰芯数据与环境和人为代理数据表明，沉积在广泛地理区域和不同栖息地类型冰川上的细菌群落趋同可能是由气候和人为驱动因素引起的。
