Stochastic Community Assembly: Does It Matter in Microbial Ecology?

Microbiology and Molecular Biology Reviews, Год журнала: 2017, Номер 81(4)

Опубликована: Окт. 12, 2017

Understanding the mechanisms controlling community diversity, functions, succession, and biogeography is a central, but poorly understood, topic in ecology, particularly microbial ecology. Although stochastic processes are believed to play nonnegligible roles shaping structure, their importance relative deterministic hotly debated. The of ecological stochasticity structure far less appreciated. Some main reasons for such heavy debates difficulty defining diverse methods used delineating stochasticity. Here, we provide critical review synthesis data from most recent studies on assembly We then describe both components embedded various processes, including selection, dispersal, diversification, drift. also different approaches inferring observational diversity patterns highlight experimental communities. In addition, research challenges, gaps, future directions research.

Язык: Английский

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A quantitative framework reveals ecological drivers of grassland microbial community assembly in response to warming

Nature Communications, Год журнала: 2020, Номер 11(1)

Опубликована: Сен. 18, 2020

Abstract Unraveling the drivers controlling community assembly is a central issue in ecology. Although it generally accepted that selection, dispersal, diversification and drift are major processes, defining their relative importance very challenging. Here, we present framework to quantitatively infer mechanisms by phylogenetic bin-based null model analysis (iCAMP). iCAMP shows high accuracy (0.93–0.99), precision (0.80–0.94), sensitivity (0.82–0.94), specificity (0.95–0.98) on simulated communities, which 10–160% higher than those from entire community-based approach. Application of grassland microbial communities response experimental warming reveals dominant roles homogeneous selection (38%) ‘drift’ (59%). Interestingly, decreases over time, enhances primarily imposed Bacillales. In addition, has correlations with drought plant productivity under control. provides an effective robust tool quantify should also be useful for animal

Язык: Английский

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Global Isotope Hydrogeology―Review

Reviews of Geophysics, Год журнала: 2019, Номер 57(3), С. 835 - 965

Опубликована: Апрель 30, 2019

Abstract Groundwater 18 O/ 16 O, 2 H/ 1 H, 13 C/ 12 C, 3 and 14 C data can help quantify molecular movements chemical reactions governing groundwater recharge, quality, storage, flow, discharge. Here, commonly applied approaches to isotopic analysis are reviewed, involving recharge seasonality, elevations, ages, paleoclimate conditions, Reviewed works confirm long held tenets: (i) that derives disproportionately from wet season winter precipitation; (ii) modern groundwaters comprise little global groundwater; (iii) “fossil” (>12,000‐year‐old) dominate aquifer storage; (iv) fossil capture late‐Pleistocene climate conditions; (v) surface‐borne contaminants more common in younger groundwaters; (vi) discharges generate substantial streamflow. isotope midlatitudes sedimentary basins equipped for irrigated agriculture, but less plentiful across high latitudes, hyperarid deserts, equatorial rainforests. Some of these underexplored systems may be suitable targets future field testing.

Язык: Английский

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Organism body size structures the soil microbial and nematode community assembly at a continental and global scale

Nature Communications, Год журнала: 2020, Номер 11(1)

Опубликована: Дек. 17, 2020

Body size is a key life-history trait that influences community assembly by affecting how ecological processes operate at the organism level. However, extent to which relative of mediate differentially sized soil organisms still unknown. Here, we investigate microorganisms and microfauna using continental-scale sampling effort combined with global-scale meta-analysis. Our results reveal general relationship between body stochastic-deterministic balance operating on assembly. The smallest (bacteria) are relatively more influenced dispersal-based stochastic processes, while larger ones (fungi, protists nematodes) structured selection-based deterministic processes. This study elucidates significant consistent an distinct in mediating their respective assemblages, thus providing better understanding mechanisms supporting biodiversity.

Язык: Английский

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Two key features influencing community assembly processes at regional scale: Initial state and degree of change in environmental conditions

Molecular Ecology, Год журнала: 2018, Номер 27(24), С. 5238 - 5251

Опубликована: Окт. 28, 2018

Abstract Belowground microbial communities strongly influence ecosystem function such that predicting may rely on understanding ecological processes assemble communities. Uncertainty remains, however, in what governs the relative contributions of different processes. To help fill this knowledge gap, we test general hypothesis both initial state and degree change environmental conditions govern assembly do so, leveraged regional‐scale nutrient organic matter addition experiments used soil (SOM) as a proxy integrated conditions. Consistent with our hypothesis, found amount SOM SOM—in response to addition—influenced These influences were most clearly observed at regional scale, suggesting potential scale dependence. More specifically, additions homogenized bacterial community composition due enhanced homogenizing dispersal when content was initially high. In contrast, led divergence variable selection low and/or increased significantly additions. Our findings indicate important connections among conditions, variables conceptual inferences highlight need strengthen between theory biogeochemical modelling.

Язык: Английский

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The chemodiversity of paddy soil dissolved organic matter correlates with microbial community at continental scales

Microbiome, Год журнала: 2018, Номер 6(1)

Опубликована: Окт. 19, 2018

Paddy soil dissolved organic matter (DOM) represents a major hotspot for biogeochemistry, yet we know little about its chemodiversity let alone the microbial community that shapes it. Here, leveraged ultrahigh-resolution mass spectrometry, amplicon, and metagenomic sequencing to characterize molecular distribution of DOM taxonomic functional diversity in paddy soils across China. We hypothesized variances significantly associate with changes composition.We report both profiles revealed geographic patterns were associated variation mean monthly precipitation, annual temperature, pH. was correlated diversity. An increase molecules categorized as peptides, carbohydrates, unsaturated aliphatics, decrease those belonging polyphenolics polycyclic aromatics, proportional some taxa, such Syntrophobacterales, Thermoleophilia, Geobacter, Spirochaeta, Gaiella, Defluviicoccus. composition also relative abundances metabolic pathways, anaerobic carbon fixation, glycolysis, lignolysis, fermentation, methanogenesis.Our study demonstrates continental-scale is profile potential rice microbiome. Abiotic factors have distinct effect on structure can influence vice versa. Deciphering these associations underlying mechanisms precipitate understanding complex ecology soils, well help assess effects human activities biogeochemistry greenhouse gas emissions soils.

Язык: Английский

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Effect of climate change on humic substances and associated impacts on the quality of surface water and groundwater: A review

The Science of The Total Environment, Год журнала: 2018, Номер 640-641, С. 1548 - 1565

Опубликована: Июнь 18, 2018

Язык: Английский

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Influences of organic carbon speciation on hyporheic corridor biogeochemistry and microbial ecology

Nature Communications, Год журнала: 2018, Номер 9(1)

Опубликована: Фев. 2, 2018

The hyporheic corridor (HC) encompasses the river-groundwater continuum, where mixing of groundwater (GW) with river water (RW) in HC can stimulate biogeochemical activity. Here we propose a novel thermodynamic mechanism underlying this phenomenon and reveal broader impacts on dissolved organic carbon (DOC) microbial ecology. We show that thermodynamically favorable DOC accumulates GW despite lower concentration, RW contains less-favorable DOC, but at higher concentrations. This indicates is protected from oxidation by low total energy within pool, whereas favorability species. GW-RW overcomes these protections stimulates respiration. Mixing models coupled geophysical molecular analyses further tipping points spatiotemporal dynamics indicate important hydrology-biochemistry-microbial feedbacks. Previously unrecognized mechanisms regulated may therefore strongly influence riverine ecosystems.

Язык: Английский

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Microbial Interactions With Dissolved Organic Matter Drive Carbon Dynamics and Community Succession

Frontiers in Microbiology, Год журнала: 2018, Номер 9

Опубликована: Июнь 8, 2018

Knowledge of dynamic interactions between natural organic matter (NOM) and microbial communities is critical not only to delineate the routes NOM degradation/transformation carbon (C) fluxes, but also understand community evolution succession in ecosystems. Yet, these processes subsurface environments are usually studied independently, a comprehensive view has been elusive thus far. In this study, we fed sediment-derived dissolved (DOM) groundwater microbes continually analyzed transformation DOM over 50-day incubation. To document fine-scale changes chemistry, applied high-resolution Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) soft X-ray absorption spectroscopy (sXAS). We monitored trajectory biomass, structure activity time period. Together, analyses provided an unprecedented indigenous microbes. Microbial decomposition labile C was immediately evident from biomass increase total (TOC) decrease. The change composition closely related turnover: early stages incubation influenced by relatively tannin- protein-like compounds; while later evolved be most correlated with less lipid- lignin-like compounds. These function, coupled contribution products pool affected further DOM, culminating stark time. Our study demonstrates distinct response biotransformation which improves our understanding processes, groundwater.

Язык: Английский

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Homogeneous selection dominates the microbial community assembly in the sediment of the Three Gorges Reservoir

The Science of The Total Environment, Год журнала: 2019, Номер 690, С. 50 - 60

Опубликована: Июль 2, 2019

Язык: Английский

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