Carbon and nitrogen biogeochemical cycling potentials of supraglacial cryoconite communities
Carbon and nitrogen biogeochemical cycling potentials of supraglacial cryoconite communities
复制标题
DOI：
10.1007/s00300-012-1178-3
复制
发表时间：
2012-09-01
期刊：
影响因子：
1.7
通讯作者：
Osborn, A. Mark
中科院分区：
文献类型：
--
作者：
Cameron, Karen A.;Hodson, Andrew J.;Osborn, A. Mark
微生物在冰川环境中的营养循环中发挥着至关重要的作用。这些系统通常是营养有限的，因此确保微生物群落营养物质可用性的生物地球化学反应对于维持这些系统至关重要。本研究利用分子生物学方法对能够在一系列冰川环境中进行碳和氮循环的冰上冰屑微生物群落进行了研究。鉴定出具有光合作用潜力的生物体，包括蓝细菌、放线菌、β-变形菌、层枝藻和附着藻。还鉴定了具有进行硝化和反硝化过程的潜力的生物，并以Betaproteobacteria、Alphaproteobacteria、Thaumarchaeota和Cyanobacteria为特征。虽然冰上环境的化学和物理参数不太可能促进所有与氮有关的生物地球化学过程的最佳速率，但将这些冰尘群落运输到下游位置，在那里可能会出现更有利的条件，这可能会提供有价值的微生物接种，具有在其他地方催化这些反应的遗传潜力。
Microorganisms have a crucial role to play in the cycling of nutrients within glacial environments. These systems are often nutrient-limited, and so biogeochemical reactions, which ensure the availability of nutrients for microbial communities, are critical for the maintenance of these systems. This study uses molecular biology to characterise the supraglacial cryoconite microbial communities that are capable of cycling carbon and nitrogen in a range of glacial environments. Organisms with the potential to photosynthesise were identified, including Cyanobacteria, Actinobacteria, Betaproteobacteria, Stramenopiles and Haptophyceae. Organisms with the potential to perform nitrification and denitrification processes were also identified and featured Betaproteobacteria, Alphaproteobacteria, Thaumarchaeota and Cyanobacteria. While it is unlikely that the chemical and physical parameters of the supraglacial environment will facilitate optimal rates of all of the nitrogen-related biogeochemical processes, the transport of these cryoconite communities to downstream locations, where more favourable conditions may prevail, will perhaps provide a valuable inoculation of microorganisms with the genetic potential to catalyse these reactions elsewhere.