Department of Marine Biology, Microbiology and Biochemistry, School of Marine Sciences, Cochin University of Science and Technology (CUSAT), Kochi, India.
National Centre for Polar and Ocean Research, Headland Sada, Vasco-da-Gama, Goa, 403 804, India.
World J Microbiol Biotechnol. 2021 Jul 13;37(8):133. doi: 10.1007/s11274-021-03098-z.
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.
康斯峡湾是一个受冰川融化和大西洋化影响显著的北极峡湾，这两个过程都是由北极加速变暖驱动的。这导致了初级生产力、碳库和微生物群落的变化，特别是在沉积物中。在这项研究中，我们使用高通量测序分析，研究了康斯峡湾表层（0-2cm）和次表层（3-9cm）沉积物中的细菌群落结构。结果表明，康斯峡湾沉积物中的细菌群落主要由门变形菌门（Proteobacteria）主导，其次是拟杆菌门（Bacteroidetes）和ε变形菌门（Epsilonbacteraeota）。虽然α-和γ-变形菌纲在表层沉积物中占优势，但δ-变形菌纲在次表层沉积物中占优势。表层和次表层沉积物中的细菌群落结构存在显著差异（p≤0.05）。总有机碳可能是控制表层和次表层沉积物中细菌多样性的主要参数之一。功能预测分析表明，细菌群落可能参与了复杂有机化合物如聚糖、糖胺聚糖、多环芳烃的降解，以及次生代谢物的生物合成。
