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拉普捷夫海冷泉底部沉积物中与甲烷相关的微生物群落的生物地球化学活性

Biogeochemical Activity of Methane-Related Microbial Communities in Bottom Sediments of Cold Seeps of the Laptev Sea.

作者信息

Savvichev Alexander S, Rusanov Igor I, Kadnikov Vitaly V, Beletsky Alexey V, Zakcharova Elena E, Samylina Olga S, Sigalevich Pavel A, Semiletov Igor P, Ravin Nikolai V, Pimenov Nikolay V

机构信息

Winogradsky Institute of Microbiology, Research Center of Biotechnology, Russian Academy of Sciences, 119071 Moscow, Russia.

Institute of Bioengineering, Research Center of Biotechnology, Russian Academy of Sciences, 119071 Moscow, Russia.

出版信息

Microorganisms. 2023 Jan 19;11(2):250. doi: 10.3390/microorganisms11020250.

DOI:10.3390/microorganisms11020250
PMID:36838215
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9964916/
Abstract

Bottom sediments at methane discharge sites of the Laptev Sea shelf were investigated. The rates of microbial methanogenesis and methane oxidation were measured, and the communities responsible for these processes were analyzed. Methane content in the sediments varied from 0.9 to 37 µmol CH dm. Methane carbon isotopic composition (δC-CH) varied from -98.9 to -77.6‱, indicating its biogenic origin. The rates of hydrogenotrophic methanogenesis were low (0.4-5.0 nmol dm day). Methane oxidation rates varied from 0.4 to 1.2 µmol dm day at the seep stations. Four lineages of anaerobic methanotrophic archaea (ANME) (1, 2a-2b, 2c, and 3) were found in the deeper sediments at the seep stations along with sulfate-reducing . The ANME-2a-2b clade was predominant among ANME. Aerobic ammonium-oxidizing (family ) predominated in the upper sediments along with heterotrophic and , and mehtanotrophs of the classes () and (families and ). Members of the genera and occurred in the sediments of the seep stations. Mehtanotrophs of the classes () and (families and ) occurred in the sediments of all stations. The microbial community composition was similar to that of methane seep sediments from geographically remote areas of the global ocean.

摘要

对拉普捷夫海陆架甲烷排放点的底部沉积物进行了调查。测量了微生物甲烷生成和甲烷氧化的速率，并分析了负责这些过程的群落。沉积物中的甲烷含量在0.9至37 μmol CH₄ dm⁻³之间变化。甲烷碳同位素组成（δ¹³C-CH₄）在-98.9至-77.6‰之间变化，表明其生物成因。氢营养型甲烷生成速率较低（0.4-5.0 nmol CH₄ dm⁻³ day⁻¹）。渗漏站的甲烷氧化速率在0.4至1.2 μmol CH₄ dm⁻³ day⁻¹之间变化。在渗漏站较深的沉积物中发现了四种厌氧甲烷氧化古菌（ANME）谱系（1、2a-2b、2c和3）以及硫酸盐还原菌。ANME-2a-2b进化枝在ANME中占主导地位。好氧氨氧化菌（亚硝化单胞菌科）在上层沉积物中占主导地位，同时还有异养细菌和古菌，以及Ⅰ型（甲基球菌科）和Ⅱ型（甲基孢囊菌科和甲基弯曲菌科）甲烷营养菌。亚硝化螺菌属和亚硝化弧菌属的成员出现在渗漏站的沉积物中。Ⅰ型（甲基球菌科）和Ⅱ型（甲基孢囊菌科和甲基弯曲菌科）甲烷营养菌出现在所有站点的沉积物中。微生物群落组成与全球海洋地理偏远地区的甲烷渗漏沉积物相似。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1a8e/9964916/cc88e5b84d96/microorganisms-11-00250-g011.jpg
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