Dams shift microbial community assembly and imprint nitrogen transformation along the Yangtze River

Gao, Yu; Zhang, Wenlong; Li, Yang; Wu, Hualong; Yang, Nan; Hui, Cizhang

doi:10.1016/j.watres.2020.116579

Cited by 84 publications

(29 citation statements)

References 58 publications

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“…The spatial distributions of bacterioplankton communities can be affected by anthropogenic land use urbanization, industrialization, and agriculturalization ( Zhao et al, 2021 ). In addition, changes in riparian land cover or flow alteration of flow damming (e.g., dams) can impact organic matter retention in rivers, filter keystone species, reshape distribution of metacommunities, mediate ecological assembly processes of microbial communities, and subsequently alter the stability of ecosystem processes ( Grill et al, 2019 ; Wang Y. et al, 2020 ; Gao et al, 2021 ). Therefore, a better understanding of river bacterioplankton ecology requires exploration of the composition and network of bacterioplankton communities in riverine ecosystems.…”

Section: Introductionmentioning

confidence: 99%

Anthropogenic Intensity-Determined Assembly and Network Stability of Bacterioplankton Communities in the Le’an River

Wang

Devlin

et al. 2022

Front. Microbiol.

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Bacterioplankton are essential components of riverine ecosystems. However, the mechanisms (deterministic or stochastic processes) and co-occurrence networks by which these communities respond to anthropogenic disturbances are not well understood. Here, we integrated niche-neutrality dynamic balancing and co-occurrence network analysis to investigate the dispersal dynamics of bacterioplankton communities along human activity intensity gradients. Results showed that the lower reaches (where intensity of human activity is high) had an increased composition of bacterioplankton communities which induced strong increases in bacterioplankton diversity. Human activity intensity changes influenced bacterioplankton community assembly via regulation of the deterministic-stochastic balance, with deterministic processes more important as human activity increases. Bacterioplankton molecular ecological network stability and robustness were higher on average in the upper reaches (where there is lower intensity of human activity), but a human activity intensity increase of about 10%/10% can reduce co-occurrence network stability of bacterioplankton communities by an average of 0.62%/0.42% in the dry and wet season, respectively. In addition, water chemistry (especially NO3–-N and Cl–) contributed more to explaining community assembly (especially the composition) than geographic distance and land use in the dry season, while the bacterioplankton community (especially the bacterioplankton network) was more influenced by distance (especially the length of rivers and dendritic streams) and land use (especially forest regions) in the wet season. Our research provides a new perspective of community assembly in rivers and important insights into future research on environmental monitoring and classified management of aquatic ecosystems under the influence of human activity.

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Section: Introductionmentioning

confidence: 99%

Anthropogenic Intensity-Determined Assembly and Network Stability of Bacterioplankton Communities in the Le’an River

Wang

Devlin

et al. 2022

Front. Microbiol.

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“…Dams affect microbial communities by altering hydrological conditions (Gao et al ., 2021). In this study, we found that river flow and river width were significant factors affecting planktonic bacteria and microeukaryotes in the dam‐affected and river zones.…”

Section: Discussionmentioning

confidence: 99%

“…SEM was used to test the direct and indirect relationships among all variables in the model. The model was built according to the theoretical conception, and several different conceptual structures were tested to determine the optimal conceptual structure by comparing the methods with the highest comparative fit index (close to 1) and the lowest root mean square error of approximation (close to 0) (Gao et al ., 2021). The relationship between the distance to dam, near‐shore anthropogenic activity and SPS was used to illustrate the importance and influence of the relationship on planktonic bacterial and microeukaryotic community diversity.…”

Section: Methodsmentioning

confidence: 99%

“…Liu et al (2018) emphasized that dams caused a sharp decline in bacterial species in downstream sediments due to severe riverbed scouring. Gao et al (2021) reported that dams influenced the distribution of microbial communities by filtering keystone species by controlling suspended sediment (SPS) concentration. In addition to damming, it should be noted that an increase in the population and economy in the river basin resulted in a sharp elevation of terrestrial anthropogenic activities.…”

Section: Introductionmentioning

confidence: 99%

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Damming river shapes distinct patterns and processes of planktonic bacterial and microeukaryotic communities

Tang

et al. 2022

Environmental Microbiology

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Planktonic bacterial and microeukaryotic communities play important roles in biogeochemical cycles, but their biogeographic patterns and community assembly processes in large damming rivers still remain unclear. In this study, 16S rRNA and 18S rRNA coding genes were used for sample sequencing analysis of planktonic bacterial and microeukaryotic communities in the upper Yangtze River. The upper Yangtze River was divided into damaffected zones and river zones based on the influence of dams. The results showed that there were significant differences in the bacterial and microeukaryotic communities between the two zones and that dams significantly reduced the α-diversity of the bacterial communities. Co-occurrence network analysis indicated that networks in the river zone were denser than those in the dam-affected zone. The relationships among species in bacterial networks were more complex than those in microeukaryotic networks. Dispersal limitation and ecological drift were the main processes influencing planktonic bacterial and microeukaryotic communities in the dam-affected zone respectively, whereas the role of deterministic processes increased in the river zone. Anthropogenic activities and hydraulic conditions affected suspended sediment and controlled microbial diversity in the river zone. These results suggest that dams impact planktonic bacteria more strongly than planktonic microeukaryotes, indicating that the distribution patterns and processes of the bacterial and microeukaryotic communities in large rivers are significantly different.

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“…high soil pH, high sodium concentrations, anthropogenic disturbance, etc.) increased the effects of deterministic selection on microbial communities (Dini‐Andreote et al ., 2015; Gao et al ., 2021). These results are in line with our results and suggest that the strong anthropogenic activities in river stretch 2 might select pollutant‐degraded or ‐tolerant microbes.…”

Section: Discussionmentioning

confidence: 99%

Anthropogenic activities change the relationship between microbial community taxonomic composition and functional attributes

Liu

Wang

Chen

2021

Environmental Microbiology

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Summary Functional redundancy is considered common in microbial systems, but recent studies have challenged this idea. The mechanism for this contradictory result is not clear. However, in this study, we hypothesize that strong environmental filtering which links to the anthropogenic activities is able to weaken microbial functional redundancy. We used metagenome and 16S rRNA gene high‐throughput sequencing to investigate planktonic microbial communities in a subtropical river. We found that the weak anthropogenic activities might result in a low selection pressure in the river upstream area. Therefore, the microbial community functional attributes were stable although the community composition changed with the water temperature and NO3‐N in upstream area (this indicates functional redundancy). However, the strong anthropogenic activities in river downstream area selected pollutant‐degraded functions (e.g. nitrogen metabolism, toluene, xylenes and ethylbenzene degradation) and potentially pollutant‐degraded (tolerant) microbes, and therefore caused the microbial community composition synchronously changed with the variation of community functional attributes. Our results reveal that strong environmental filtering which associates with the anthropogenic activities not only has effects on microbial community composition and community functional attributes but also on their relationships. These results provide a new insight to refine the functional redundancy idea.

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Dams shift microbial community assembly and imprint nitrogen transformation along the Yangtze River

Cited by 84 publications

References 58 publications

Anthropogenic Intensity-Determined Assembly and Network Stability of Bacterioplankton Communities in the Le’an River

Anthropogenic Intensity-Determined Assembly and Network Stability of Bacterioplankton Communities in the Le’an River

Damming river shapes distinct patterns and processes of planktonic bacterial and microeukaryotic communities

Anthropogenic activities change the relationship between microbial community taxonomic composition and functional attributes

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