Kongsfjorden, an Arctic fjord is significantly affected by the glacier melt and Atlantification, both the processes driven by accelerated warming in the Arctic. This has lead to changes in primary production, carbon pool and microbial communities, especially that in the sediment. In this study, we have examined the bacterial community structure of surface (0–2 cm) and subsurface (3–9 cm) sediments of Kongsfjorden using the high throughput sequencing analysis. Results revealed that bacterial community structure of Kongsfjorden sediments were dominated by phylum Proteobacteria followed by Bacteroidetes and Epsilonbacteraeota. While α- and γ-Proteobacterial class were dominant in surface sediments; δ-Proteobacteria were found to be predominant in subsurface sediments. The bacterial community structure in the surface and subsurface sediments showed significant variations (p ≤ 0.05). Total organic carbon could be one of the major parameters controlling the bacterial diversity in the surface and subsurface sediments. Functional prediction analysis indicated that the bacterial community could be involved in the degradation of complex organic compounds such as glycans, glycosaminoglycans, polycyclic aromatic hydrocarbons and also in the biosynthesis of secondary metabolites.

北极峡湾 Kongsfjorden 受到冰川融化和大西洋化的显着影响，这两个过程都是由北极加速变暖驱动的。这导致初级生产、碳库和微生物群落发生变化，尤其是沉积物中的微生物群落。在这项研究中，我们使用高通量测序分析检查了 Kongsfjorden 地表（0-2 厘米）和地下（3-9 厘米）沉积物的细菌群落结构。结果表明，Kongsfjorden 沉积物的细菌群落结构以变形杆菌门为主，其次是拟杆菌门和Epsilonbacteraeota。而α-和γ-变形菌纲在表层沉积物中占优势；δ-变形菌发现主要存在于地下沉积物中。表层和亚表层沉积物中的细菌群落结构表现出显着变化（p ≤ 0.05）。总有机碳可能是控制表层和地下沉积物细菌多样性的主要参数之一。功能预测分析表明，细菌群落可能参与复杂有机化合物如聚糖、糖胺聚糖、多环芳烃的降解以及次级代谢物的生物合成。