Deterministic process controlling the prokaryotic community assembly across seamounts along in the Yap and Mariana trenches

Microbial community growth efficiency, the ratio of production to substrate assimilated, could provide insights into carbon flow among microbes and the regulation of marine biogeochemical cycles. However, by far microbial metabolic characters were largely undetermined in the deep hadal trench. Here, the structural and metabolism characteristics of microbial communities in five different trenches were investigated using Illumina high-throughput sequencing and quantitative PCR, as well as incubation with the 3H-leucine incorporation method and electron transport system. The community structure and diversity in the trenches located in different hemispheres were significantly different, with significantly higher of diversity and gene abundance appear in the northern and southern hemispheres, respectively. Depth, TOC and TP were identified as key factors. Cooperative relationship existed among different microbial groups as demonstrated by the co-occurrence network and Pearson correlation analysis. The respiration rates were significantly higher in the northern hemisphere than those in the southern hemisphere under atmospheric pressure. The prokaryotic growth efficiencies (PGE) were significantly higher under atmospheric pressure than under high hydrostatic pressure, this negative effect possibly because carbon flow was more inclined to maintain respiration under high hydrostatic pressure. This study represented the first comprehensive investigation of the microbial community structure and metabolic characteristics of sediments in different trenches, providing a preliminary insight into the processes and efficiency of microbial-driven carbon cycles in the deep biosphere.

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Geographical distribution and driving force of microbial communities in the sediments of Diamantina and Kermadec trenches

Zhang,

Jing,

Liu

2024

Front. Microbiol.

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The distinctive geological characteristics of hadal trenches are recognized to affect the construction and ecological role of microbial communities; however, information on their population dynamics and assembly processes remains limited. In this study, bacteria and micro-eukaryotes in the sediments of the Diamantina and Kermadec trenches were explored utilizing high-throughput sequencing. Compared to the Diamantina Trench, significantly lower levels of bacterial and micro-eukaryotic biodiversity (p < 0.01), bacterial gene copy number (p < 0.05), and heterotrophic/parasitic micro-eukaryotic proportions (p < 0.05) were detected in the Kermadec Trench, which also exhibited a low community complexity based on the network analysis. Within each trench, no obvious population shifts were observed along the trench axis. Microbial communities in both trenches showed clear distance–decay distributions, mainly driven by stochastic processes. This study provided fresh perspectives on the microbial community assembly mechanism in deep-sea trenches. Studies of community complexity and diversified trophic states of microbes would contribute to an improved understanding of ecological functions and diversification in this extreme biosphere.

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Deterministic process controlling the prokaryotic community assembly across seamounts along in the Yap and Mariana trenches

Cited by 3 publications

References 44 publications

Metagenome sequencing and 107 microbial genomes from seamount sediments along the Yap and Mariana trenches

Metagenome sequencing and 107 microbial genomes from seamount sediments along the Yap and Mariana trenches

Microbial community structure and metabolic characteristics in the five different hadal trenches

Geographical distribution and driving force of microbial communities in the sediments of Diamantina and Kermadec trenches

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