Anthropogenic activities mediate stratification and stability of microbial communities in freshwater sediments

Microbiome, Journal Year: 2023, Volume and Issue: 11(1)

Published: Aug. 26, 2023

Freshwater sediment microbes are crucial decomposers that play a key role in regulating biogeochemical cycles and greenhouse gas emissions. They often exhibit highly ordered structure along depth profiles. This stratification not only reflects redox effects but also provides valuable insights into historical transitions, as sediments serve important archives for tracing environmental history. The Anthropocene, candidate geological epoch, has recently garnered significant attention. However, the human impact on zonation under cover of natural niches remains poorly understood. Dam construction stands one most far-reaching anthropogenic modifications aquatic ecosystems. Here we attempted to identify ecological imprint damming freshwater microbiome.We conducted year-round survey profiles Lake Chaohu, large shallow lake China. Through depth-discrete shotgun metagenomics, metataxonomics, geophysiochemical analyses, unveiled unique prokaryotic hierarchy shaped by interplay regime (labeled 137Cs peak AD 1963). Dam-induced initial differentiation was further amplified nitrogen methane metabolism, forming an abrupt transition governing nitrate-methane metabolic interaction gaseous sequestration depth. Using random forest algorithm, identified damming-sensitive taxa possess distinctive strategies, including energy-saving mechanisms, motility behavior, deep-environment preferences. Moreover, null model analysis showed altered microbial community assembly, from selection-oriented deterministic process above more stochastic, dispersal-limited below. Temporal investigation rapid zone ecotone, characterized high species richness, low stability, emergent stochasticity. Path revealed observed stochasticity primarily came flexibility, which potentially contributed both statistical neutralities.We delineate picture dam-induced nutrient availability sedimentation rates activities generate great changes structure, stability microbiome. These findings reflect profound ramifications human-Earth system interactions help re-examine mainstream views formation stratification. Video Abstract.

Language: Английский

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Environmental challenges related to methane hydrate decomposition from climate change scenario and anthropic activities: State of the art, potential consequences and monitoring solutions

Earth-Science Reviews, Journal Year: 2023, Volume and Issue: 246, P. 104578 - 104578

Published: Oct. 2, 2023

Language: Английский

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Survival Strategies and Assembly Mechanisms of Microbial Communities in Petroleum-Contaminated Soils

Environmental Research, Journal Year: 2024, Volume and Issue: 262, P. 119857 - 119857

Published: Aug. 27, 2024

Language: Английский

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Ebullition drives high methane emissions from a eutrophic coastal basin

Geochimica et Cosmochimica Acta, Journal Year: 2024, Volume and Issue: 384, P. 1 - 13

Published: Sept. 1, 2024

The production of methane in coastal sediments and its release to the water column is intensified by anthropogenic eutrophication bottom hypoxia, it still uncertain whether emissions atmosphere will be enhanced. Here, we assess seasonal variations dynamics a eutrophic, seasonally euxinic basin (Scharendijke, Lake Grevelingen). In-situ benthic chamber incubations reveal high rates from sediment (74 – 163 mmol m−2 d−1) during monthly measurements between March October 2021. Comparison these in-situ total fluxes calculated diffusive point towards major role for ebullition. In spring fall, when was oxic, microbial removal dissolved occurred aerobically water. summer, contrast, accumulated concentrations up 67 μmol L−1 below oxycline. Shifts δ13C–CH4 δD-CH4 higher values abundant presence oxidizing bacteria around oxycline, likely through both aerobic anaerobic pathways, with latter possibly linked iron oxide reduction. lower above oxycline indicate that bubble dissolution contributed methane. Methane were observed all seasons highest, measured (1.2 upon onset mixing at end summer. events measurement water-air model calculations flux form bubbles, which bypass filter. suggest potential year-round ebullitive 30 120 d−1. We conclude eutrophic systems may much than previously thought because

Language: Английский

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Methanogenesis pathways of methanogens and their responses to substrates and temperature in sediments from the South Yellow Sea

The Science of The Total Environment, Journal Year: 2022, Volume and Issue: 815, P. 152645 - 152645

Published: Jan. 5, 2022

Language: Английский

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