التفاصيل البيبلوغرافية
العنوان: |
High hydrostatic pressure stimulates microbial nitrate reduction in hadal trench sediments under oxic conditions. |
المؤلفون: |
Yang, Na, Lv, Yongxin, Ji, Mukan, Wu, Shiguo, Zhang, Yu |
المصدر: |
Nature Communications; 3/19/2024, Vol. 15 Issue 1, p1-12, 12p |
مصطلحات موضوعية: |
MARIANA Trench, HYDROSTATIC pressure, TRENCHES, NITROGEN cycle, BIOGEOCHEMICAL cycles, DENITRIFICATION, EXTREME environments, SEDIMENTS |
مستخلص: |
Hadal trenches are extreme environments situated over 6000 m below sea surface, where enormous hydrostatic pressure affects the biochemical cycling of elements. Recent studies have indicated that hadal trenches may represent a previously overlooked source of fixed nitrogen loss; however, the mechanisms and role of hydrostatic pressure in this process are still being debated. To this end, we investigate the effects of hydrostatic pressure (0.1 to 115 MPa) on the chemical profile, microbial community structure and functions of surface sediments from the Mariana Trench using a Deep Ocean Experimental Simulator supplied with nitrate and oxygen. We observe enhanced denitrification activity at high hydrostatic pressure under oxic conditions, while the anaerobic ammonium oxidation – a previously recognized dominant nitrogen loss pathway – is not detected. Additionally, we further confirm the simultaneous occurrence of nitrate reduction and aerobic respiration using a metatranscriptomic dataset from in situ RNA-fixed sediments in the Mariana Trench. Taken together, our findings demonstrate that hydrostatic pressure can influence microbial contributions to nitrogen cycling and that the hadal trenches are a potential nitrogen loss hotspot. Knowledge of the influence of hydrostatic pressure on anaerobic processes in oxygenated surface sediments can greatly broaden our understanding of element cycling in hadal trenches. Hadal trenches are the deepest oceanic ecosystems, with water depth over 6000 m, and are among the least explored habitats on Earth. This research demonstrates that high hydrostatic pressure enhances denitrification activity under oxic conditions, potentially making hadal trenches fixed nitrogen loss hotpots. [ABSTRACT FROM AUTHOR] |
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قاعدة البيانات: |
Complementary Index |