Environmental filtering governs consistent vertical zonation in sedimentary microbial communities across disconnected mountain lakes

Environmental Microbiology, Journal Year: 2024, Volume and Issue: 26(3)

Published: March 1, 2024

Abstract Subsurface microorganisms make up the majority of Earth's microbial biomass, but ecological processes governing surface communities may not explain community patterns at depth because burial. Depth constrains dispersal and energy availability, when combined with geographic isolation across landscapes, influence assembly. We sequenced 16S rRNA gene bacteria archaea from 48 sediment cores 36 lakes in four disconnected mountain ranges Wyoming, USA used null models to infer assembly depth, spatial isolation, varying environments. Although we expected strong limitations these isolated settings, composition was primarily shaped by environmental selection. Communities consistently shifted domination organisms that degrade organic matter methanogenic, low‐energy adapted taxa deeper zones. Stochastic processes—like limitation—contributed differences among lakes, effects weakened selection ultimately governed subsurface biogeography.

Language: Английский

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Historical trajectories of antibiotics resistance genes assessed through sedimentary DNA analysis of a subtropical eutrophic lake

Environment International, Journal Year: 2024, Volume and Issue: 186, P. 108654 - 108654

Published: April 1, 2024

Investigating the occurrence of antibiotic-resistance genes (ARGs) in sedimentary archives provides opportunities for reconstructing distribution and dissemination historical (i.e., non-anthropogenic origin) ARGs. Although ARGs freshwater environments have attracted great attention, variations diversity abundance over centuries to millennia remain largely unknown. In this study, we investigated vertical change patterns bacterial communities, mobile genetic elements (MGEs) found sediments Lake Chenghai spanning past 600 years. Within resistome preserved sediments, 177 subtypes were with aminoglycosides multidrug resistance being most abundant. The ARG upper sediment layers (equivalent post-antibiotic era since 1940s) was lower than those during pre-antibiotic era, whereas higher possibly because human-induced lake eutrophication recent decades facilitated spread proliferation drug-resistant bacteria. Statistical analysis suggested that MGEs community structure significantly correlated ARGs, suggesting may be transferred between different bacteria by MGEs. Our results provide new perspectives on natural history are essential understanding temporal dynamics

Language: Английский

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Deciphering source, degradation status and temporal trends of organic matter in a himalayan freshwater lake using multiproxy indicators, optically stimulated luminescence dating and time series forecasting

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 957, P. 177618 - 177618

Published: Nov. 23, 2024

Language: Английский

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Differential insights into the distribution characteristics of archaeal communities and their response to typical pollutants in the sediments and soils of deep-water reservoir

Journal of environmental chemical engineering, Journal Year: 2024, Volume and Issue: unknown, P. 114256 - 114256

Published: Sept. 1, 2024

Language: Английский

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