Strong linkages between dissolved organic matter and the aquatic bacterial community in an urban river

Zhang, Lei; Fang, Wangkai; Li, Xingchen; Lu, Wenxuan; Li, Jing

doi:10.1016/j.watres.2020.116089

Cited by 82 publications

(27 citation statements)

References 94 publications

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“…Mobilization of shallow soil-borne DOM is supported by the observation that PARAFAC components C3 (low-molecular weight; humic) and C4 (recently produced; protein-like) increased in with septic:stormwater and suggest that low tides enhance combined terrestrial and anthropogenic DOM signatures. Although the extent of surface-subsurface connectivity was not measured in this study, it can influence DOM composition (Chen et al, 2010;Zhang et al, 2020).…”

Section: Role Of Hydrology On Dom Compositionmentioning

confidence: 94%

Stormwater Runoff and Tidal Flooding Transform Dissolved Organic Matter Composition and Increase Bioavailability in Urban Coastal Ecosystems

et al. 2021

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Dissolved organic matter (DOM) is a vital component of the aquatic carbon cycle and constitutes the majority of terrestrial organic carbon inputs from rivers to the ocean (Battin et al., 2008;Hedges et al., 1997). Indeed, DOM controls a range of biogeochemical processes by regulating nutrient availability and microbial activities (Coble et al., 2019;Fellman et al., 2008;Hullar et al., 2006). In coastal drainages, DOM originates from a range of allochthonous and autochthonous sources including terrestrial plants and

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Section: Role Of Hydrology On Dom Compositionmentioning

confidence: 94%

Stormwater Runoff and Tidal Flooding Transform Dissolved Organic Matter Composition and Increase Bioavailability in Urban Coastal Ecosystems

et al. 2021

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“…The bacterioplankton community is especially sensitive to environmental change, which is a ubiquitous and indispensable freshwater river ecosystem component that plays a key role in biogeochemical processes [2]. The structure of the bacterioplankton community can also reflect the ecological environment of the river to a certain extent and is an ideal indicator that can be used to monitor the ecological impacts of human activities on the functional characteristics of the river water environment [3]. Previous work has shown that human influences affect microbiome composition [4][5][6], microbe-microbe interactions [7,8] and microbe-host interactions [3,9,10].…”

Section: Introductionmentioning

confidence: 99%

“…The structure of the bacterioplankton community can also reflect the ecological environment of the river to a certain extent and is an ideal indicator that can be used to monitor the ecological impacts of human activities on the functional characteristics of the river water environment [3]. Previous work has shown that human influences affect microbiome composition [4][5][6], microbe-microbe interactions [7,8] and microbe-host interactions [3,9,10]. Although it is well documented that such changes in network structure affect ecosystem functioning and stability, little is known about the link between human activity intensity and the stability of these microbial systems and whether and how the ecological networks, particularly bacterioplankton molecular ecological networks, will change under human activity intensity change scenarios.…”

Section: Introductionmentioning

confidence: 99%

Spatial and Temporal Distribution of Bacterioplankton Molecular Ecological Networks in the Yuan River under Different Human Activity Intensity

Wang

Devlin

et al. 2021

Microorganisms

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Bacterioplankton communities play a crucial role in freshwater ecosystem functioning, but it is unknown how co-occurrence networks within these communities respond to human activity disturbances. This represents an important knowledge gap because changes in microbial networks could have implications for their functionality and vulnerability to future disturbances. Here, we compare the spatiotemporal and biogeographical patterns of bacterioplankton molecular ecological networks using high-throughput sequencing of Illumina HiSeq and multivariate statistical analyses from a subtropical river during wet and dry seasons. Results demonstrated that the lower reaches (high human activity intensity) network had less of an average degree (10.568/18.363), especially during the dry season, when compared with the upper reaches (low human activity intensity) network (10.685/37.552) during the wet and dry seasons, respectively. The latter formed more complexity networks with more modularity (0.622/0.556) than the lower reaches (high human activity intensity) network (0.505/0.41) during the wet and dry seasons, respectively. Bacterioplankton molecular ecological network under high human activity intensity became significantly less robust, which is mainly caused by altering of the environmental conditions and keystone species. Human activity altered the composition of modules but preserved their ecological roles in the network and environmental factors (dissolved organic carbon, temperature, arsenic, oxidation–reduction potential and Chao1 index) were the best parameters for explaining the variations in bacterioplankton molecular ecological network structure and modules. Proteobacteria, Actinobacteria and Bacteroidetes were the keystone phylum in shaping the structure and niche differentiations in the network. In addition, the lower reaches (high human activity intensity) reduce the bacterioplankton diversity and ecological niche differentiation, which deterministic processes become more important with increased farmland and constructed land area (especially farmland) with only 35% and 40% of the community variation explained by the neutral community model during the wet season and dry season, respectively. Keystone species in high human activity intensity stress habitats yield intense functional potentials and Bacterioplankton communities harbor keystone taxa in different human activity intensity stress habitats, which may exert their influence on microbiome network composition regardless of abundance. Therefore, human activity plays a crucial role in shaping the structure and function of bacterioplankton molecular ecological networks in subtropical rivers and understanding the mechanisms of this process can provide important information about human–water interaction processes, sustainable uses of freshwater as well as watershed management and conservation.

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“…Meanwhile, growth of microorganisms is generally governed by the growth-supporting organic matter and nutrients (bottom-up control) and predators' predation (top-down control) in the DOC-microorganism-predator ecosystem within relevant time scales [4][5][6]. Concerns on the impacts of DOC pollution and eukaryotic predation have led to extensive studies on factors changing the resistance and resilience of microbial communities and consequent community stability [7,8]. Nonetheless, experimental evidences of the impact of DOC pollution on oscillation of microbial taxa and community stability in the DOC-microorganismpredator system remain scarce [9,10,11].…”

Section: Introductionmentioning

confidence: 99%

Organic Carbon and Eukaryotic Predation Synergistically Change Resistance and Resilience of Aquatic Microbial Communities

Fang¹,

Liu²,

Mu³

et al. 2021

Preprint

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With dramatic global rise of urbanization, anthropogenic activities alter aquatic ecosystems in urban rivers through inputs of dissolved organic carbon (DOC) and nutrients. Microorganisms play crucial roles in global biogeochemical element cycles, providing functions to sustain microbial ecology stability. The DOC (bottom-up control) and microbial predation (top-down control) may synergistically drive the competition and evolution of aquatic microbial communities, and their resistance and resilience, of which experimental evidences remain scarce. In this study, laboratory sediment-water column experiments were employed to mimic the organic carbon-driven water blackening and odorization process in urban rivers and to elucidate impacts of DOC on the microbial ecology stability. Results showed that low DOC (25-75 mg/L TOC) and high DOC (100-150 mg/L TOC) changed the aquatic microbial community assemblies in different patterns: (1) the low DOC enriched K-selection microorganisms (e.g., bacteria and predators) with low biomass and low resilience, as well as high resistance to perturbations in changing microbial community assemblies; (2) the high DOC was associated with r-selection microorganisms with high biomass and improved resilience, together with low resistance detrimental to microbial ecology stability. Overall, this study provided new insights into impacts of DOC on aquatic microbial ecology stability, which may guide sustainable urban river management.

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Strong linkages between dissolved organic matter and the aquatic bacterial community in an urban river

Cited by 82 publications

References 94 publications

Stormwater Runoff and Tidal Flooding Transform Dissolved Organic Matter Composition and Increase Bioavailability in Urban Coastal Ecosystems

Stormwater Runoff and Tidal Flooding Transform Dissolved Organic Matter Composition and Increase Bioavailability in Urban Coastal Ecosystems

Spatial and Temporal Distribution of Bacterioplankton Molecular Ecological Networks in the Yuan River under Different Human Activity Intensity

Organic Carbon and Eukaryotic Predation Synergistically Change Resistance and Resilience of Aquatic Microbial Communities

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