Cyanobacteria are integral to soil development in the earliest stages of primary succession by fixing carbon (C) and nitrogen (N) essential for organismal growth. In this study, we examined soil cyanobacterial communities at the earliest stage of succession (<5 years) at two disparate glacial forefields to reveal cyanobacterial patterns central to ecosystem development. Despite vast differences in climate and the relative dominance of heterotrophic versus autotrophic bacteria in these forefields, we found common patterns in cyanobacterial community composition in early soils. This work adds to limited research suggesting the importance of non-heterocytous filamentous cyanobacteria in initial soil colonization and development of primary succession of glacier forefields. Further, a phosphorus (P) addition experiment suggests P-limitation as a mechanism underlying the restricted presence of ecologically important, putatively N-fixing, Nostocales in these emerging landscapes.

蓝细菌通过固定生物生长必不可少的碳（C）和氮（N），在初级演替的最早阶段是土壤发育不可或缺的部分。在这项研究中，我们检查了两个不同的冰川前场演替的最早阶段（<5年）中的土壤蓝细菌群落，以揭示蓝藻模式对生态系统发展至关重要。尽管这些前场在气候和异养细菌与自养细菌之间存在巨大差异，但我们发现早期土壤中蓝细菌群落组成的常见模式。这项工作增加了有限的研究，表明非异源性丝状蓝细菌在初始土壤定殖和冰川前场初级演替发展中的重要性。进一步，