Key Laboratory of Ecological Safety and Sustainable Development in Arid Lands, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China; Key Laboratory of Extreme Environmental Microbial Resources and Engineering of Gansu Province, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China; University of Chinese Academy of Sciences, Beijing 100049, China.
Key Laboratory of Extreme Environmental Microbial Resources and Engineering of Gansu Province, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China; Key Laboratory of Cryospheric Sciences and Frozen Soil Engineering, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China; University of Chinese Academy of Sciences, Beijing 100049, China.
Environ Int. 2024 Jul;189:108788. doi: 10.1016/j.envint.2024.108788. Epub 2024 May 31.
The phenomenon of glacial freezing and thawing involves microbial sequestration, release, and colonization, which has the potential to impact ecosystem functioning through changes in microbial diversity and interactions. In this study, we examined the structural features of microbial communities of the Dongkemadi glacier, including bacteria, fungi, and archaea, in four distinct glacial environments (snow, ice, meltwater, and frontier soil). The sequestration, release, and colonization of glacial microbes have been found to significantly impact the diversity and structure of glacial microbial communities, as well as the complexity of microbial networks. Specifically, the complexity of bacterial networks has been observed to increase in a sequential manner during these processes. Utilizing the Inter-Domain Ecological Network approach, researchers have further explored the cross-trophic interactions among bacteria, fungi, and archaea. The complexity of the bacteria-fungi-archaea network exhibited a sequential increase due to the processes of sequestration, release, and colonization of glacial microbes. The release and colonization of glacial microbes led to a shift in the role of archaea as key species within the network. Additionally, our findings suggest that the hierarchical interactions among various microorganisms contributed to the heightened complexity of the bacteria-fungi-archaea network. The primary constituents of the glacial microbial ecosystem are unclassified species associated with the Polaromonas. It is noteworthy that various key species in glacial ecosystems are influenced by the distinct environmental factors. Moreover, our findings suggest that key species are not significantly depleted in response to abrupt alterations in individual environmental factors, shedding light on the dynamics of microbial cross-trophic interactions within glacial ecosystems.
冰川的冻融现象涉及微生物的固持、释放和定殖，这可能通过微生物多样性和相互作用的变化影响生态系统功能。在这项研究中，我们研究了东柯马迪冰川四个不同冰川环境（雪、冰、融水和前沿土壤）中的微生物群落结构特征，包括细菌、真菌和古菌。冰川微生物的固持、释放和定殖已被发现对冰川微生物群落的多样性和结构以及微生物网络的复杂性有显著影响。具体而言，在这些过程中，细菌网络的复杂性被观察到依次增加。研究人员利用跨域生态网络方法进一步研究了细菌、真菌和古菌之间的交叉营养相互作用。由于冰川微生物的固持、释放和定殖过程，细菌-真菌-古菌网络的复杂性呈现出依次增加的趋势。冰川微生物的释放和定殖导致古菌在网络中作为关键种的作用发生转变。此外，我们的研究结果表明，各种微生物之间的层次相互作用导致了细菌-真菌-古菌网络的复杂性增加。冰川微生物生态系统的主要成分是与极性菌相关的未分类物种。值得注意的是，冰川生态系统中的各种关键物种受到不同环境因素的影响。此外，我们的研究结果表明，关键物种不会因个别环境因素的突然变化而明显减少，这揭示了冰川生态系统中微生物交叉营养相互作用的动态。
