Omelon Christopher R, Pollard Wayne H, Ferris F Grant
Department of Geology, University of Toronto, 22 Russell Street, Toronto, Ontario, M5S-3B1, Canada.
Microb Ecol. 2007 Nov;54(4):740-52. doi: 10.1007/s00248-007-9235-0. Epub 2007 Apr 25.
Cryptoendolithic habitats in the Canadian high Arctic are associated with a variety of microbial community assemblages, including cyanobacteria, algae, and fungi. These habitats were analyzed for the presence of metal ions by sequential extraction and evaluated for relationships between these and the various microorganisms found at each site using multivariate statistical methods. Cyanobacteria-dominated communities exist under higher pH conditions with elevated concentrations of calcium and magnesium, whereas communities dominated by fungi and algae are characterized by lower pH conditions and higher concentrations of iron, aluminum, and silicon in the overlying surfaces. These results suggest that the activity of the dominant microorganisms controls the pH of the surrounding environment, which in turn dictates rates of weathering or the possibility for surface crust formation, both ultimately deciding the structure of microbial diversity for each cryptoendolithic habitat.
加拿大北极地区的隐生岩内栖息地与多种微生物群落组合相关，包括蓝细菌、藻类和真菌。通过连续萃取分析了这些栖息地中金属离子的存在情况，并使用多元统计方法评估了这些金属离子与每个地点发现的各种微生物之间的关系。以蓝细菌为主的群落存在于较高pH值条件下，钙和镁浓度升高，而以真菌和藻类为主的群落的特征是较低pH值条件以及上覆表面中铁、铝和硅的浓度较高。这些结果表明，优势微生物的活动控制着周围环境的pH值，这反过来又决定了风化速率或表面结壳的可能性，两者最终都决定了每个隐生岩内栖息地的微生物多样性结构。
