Periodic and Spatial Spreading of Alkanes and Alcanivorax Bacteria in Deep Waters of the Mariana Trench
| Autor: | Zhao-Ming Gao, Yong Wang, Wen Li Li, Yu-Zhi Wu, Zhan-Fei Wei, Pei-Wei Zhang, Jiao-Mei Huang, Zhuang Han, Guo-Jie Cui |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Total organic carbon
0303 health sciences Ecology biology 010502 geochemistry & geophysics biology.organism_classification 01 natural sciences Applied Microbiology and Biotechnology Deep sea 03 medical and health sciences chemistry.chemical_compound Oceanography Nitrate chemistry Trench Mariana Trench Environmental science Ecosystem Alcanivorax Relative species abundance 030304 developmental biology 0105 earth and related environmental sciences Food Science Biotechnology |
| Zdroj: | Applied and Environmental Microbiology. 85 |
| ISSN: | 1098-5336 0099-2240 |
| DOI: | 10.1128/aem.02089-18 |
| Popis: | In subduction zones, serpentinization and biological processes may release alkanes to the deep waters, which would probably result in the rapid spread of Alcanivorax. However, the timing and area of the alkane distribution and associated enrichment of alkane-degrading microbes in the dark world of the deep ocean have not been explored. In this study, we report the richness (up to 17.8%) of alkane-degrading bacteria, represented by Alcanivorax jadensis, in deep water samples obtained at 3,000 to 6,000 m in the Mariana Trench in two cruises. The relative abundance of A. jadensis correlated with copy numbers of functional almA and alkB genes, which are involved in alkane degradation. In these water samples, we detected a high flux of alkanes, which probably resulted in the prevalence of A. jadensis in the deep waters. Contigs of A. jadensis were binned from the metagenomes for examination of alkane degradation pathways and deep sea-specific pathways, which revealed a lack of nitrate and nitrite dissimilatory reduction in our A. jadensis strains. Comparing the results for the two cruises conducted close to each other, we suggest periodic release of alkanes that may spread widely but periodically in the trench. Distribution of alkane-degrading bacteria in the world’s oceans suggests the periodic and remarkable contributions of Alcanivorax to the deep sea organic carbon and nitrogen sources. IMPORTANCE In the oligotrophic environment of the Mariana Trench, alkanes as carbohydrates are important for the ecosystem, but their spatial and periodic spreading in deep waters has never been reported. Alkane-degrading bacteria such as Alcanivorax spp. are biological signals of the alkane distribution. In the present study, Alcanivorax was abundant in some waters, at depths of up to 6,000 m, in the Mariana Trench. Genomic, transcriptomic, and chemical analyses provide evidence for the presence and activities of Alcanivorax jadensis in deep sea zones. The periodic spreading of alkanes, probably from the subductive plates, might have fundamentally modified the local microbial communities, as well as perhaps the deep sea microenvironment. |
| Databáze: | OpenAIRE |
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