Contrasting community assembly processes structure lotic bacteria metacommunities along the river continuum

Gweon, Hyun S.; Bowes, Michael J.; Moorhouse, Heather; Oliver, Anna; Bailey, Mark; Acreman, M.; Read, Daniel S.

doi:10.1111/1462-2920.15337

Cited by 87 publications

(45 citation statements)

References 118 publications

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“…Our water results were consistent with the studies with the surface ocean microbiota (Logares et al ., 2020) and the river planktonic prokaryotic communities in Jiulong River (Isabwe et al ., 2018). However, the predominant assembly processes for planktonic bacterial community in ocean (Allen et al ., 2020) and in river (Gweon et al ., 2021) were contrary. In addition to the response to the salinity changes, shifts in bacterial assembly processes have been observed along other specific gradients, such as latitude (Jiao et al ., 2020), seasonal (Liu et al ., 2020a), pH (Xun et al ., 2019), water content (Gao et al ., 2021) and soil depth (Luan et al ., 2020) gradients.…”

Section: Discussionmentioning

confidence: 92%

Assembly processes and source tracking of planktonic and benthic bacterial communities in the Yellow River estuary

Wang

et al. 2021

Environmental Microbiology

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Summary Estuaries connect rivers with the ocean and are considered transition regions due to the continuous inputs from rivers. Microbiota from different sources converge and undergo succession in these transition regions, but their assembly mechanisms along environmental gradients remain unclear. Here, we found that salinity had a stronger effect on planktonic than on benthic microbial communities, and the dominant planktonic bacteria changed more distinctly than the dominant benthic bacteria with changes in salinity. The planktonic bacteria in the brackish water came mainly from seawater, which was confirmed in the laboratory, whereas the benthic bacteria were weakly affected by salinity, which appeared to be a mixture of the bacteria from riverine and oceanic sediments. Benthic bacterial community assembly in the sediments was mainly controlled by homogeneous selection and almost unaffected by changes in salinity, the dominant assemblage processes for planktonic bacteria changed dramatically along the salinity gradient, from homogeneous selection in freshwater to drift in seawater. Our results highlight that salinity is the key driver of estuarine microbial succession and that salinity is more important in shaping planktonic than benthic bacterial communities in the Yellow River estuary.

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Section: Discussionmentioning

confidence: 92%

Assembly processes and source tracking of planktonic and benthic bacterial communities in the Yellow River estuary

Wang

et al. 2021

Environmental Microbiology

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“…However, previous studies evidenced a mixture of processes for the bacterial community assembly in river systems (Graham et al, 2017;Gweon et al, 2021;Zhang P. et al, 2021). For example, someone suggested that the bacterial community was largely shaped by deterministic processes in the world's largest water diversion canal (Zhang P. et al, 2021), but another study showed that stochastic processes exhibited a greater influence on the bacterial assembly in the River Thames (Gweon et al, 2021). Environmental selection (deterministic process) plays an important role in dynamic habitats with pronounced environmental gradients, whereas stochastic processes could govern community assembly in less variable environments (Verberk, 2012).…”

Section: Introductionmentioning

confidence: 97%

“…Conversely, the niche theory claim that microbial communities are shaped by the deterministic processes due to habitat preferences and fitness of microbiomes, which include the biotic and abiotic factors (Rosindell et al, 2011;Stegen et al, 2013). However, previous studies evidenced a mixture of processes for the bacterial community assembly in river systems (Graham et al, 2017;Gweon et al, 2021;Zhang P. et al, 2021). For example, someone suggested that the bacterial community was largely shaped by deterministic processes in the world's largest water diversion canal (Zhang P. et al, 2021), but another study showed that stochastic processes exhibited a greater influence on the bacterial assembly in the River Thames (Gweon et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Deterministic processes shape bacterial community assembly in a karst river across dry and wet seasons

Zhang

Yang

et al. 2022

Front. Microbiol.

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Karst rivers are particularly vulnerable to bacterial pollution because immigrations are easily diffused from the surrounding environments due to their strong hydraulic connectivity. However, the assembly mechanism in shaping riverine bacterial biogeography is still poorly understood, especially for an ecosystem in the karst area. Here, 16S rRNA genes were used to explore the spatiotemporal and biogeographical patterns of bacterial communities from the Chishui River in the dry and wet seasons, and explore the impact of external immigration on the assembly of water bacterial communities. Our results showed clear spatiotemporal patterns of bacterial communities with a more pronounced seasonal rather than spatial fluctuation, which appeared to be dependent on seasonal-related environmental factors (e.g., temperature and turbidity). The bacterial communities exhibited a significant (p < 0.05) distance–decay pattern in both seasons, and they had a stronger distance–decay relationship in the dry season than in the wet season. However, most of the biomarkers of different external immigrations did not show significant (p > 0.05) distance–decay patterns along the Chishui river, implying that the biomarkers could be used as indicators of external immigration (e.g., OTU_125 and OTU_536). Also, the tributaries were the main external immigration (20.44–83.68%) for the Chishui River, while other terrestrial immigration (e.g., livestock, the soil of the cropland, brewing wastewater treatment plant, and sewages) showed relatively little influence, which could be due to the hydrodynamic conditions (e.g., fragile rock–soil system and hydrological structure) of the karst river. Additionally, the assembly of water bacterial communities in the Chishui river was governed by more determinism (50.7–85.7%) than stochasticity (14.3–49.3%) in both the dry and wet seasons. We demonstrated that the bacterial community’s substantial variations are largely shaped by deterministic processes, thereby providing a better understanding of spatiotemporal patterns and mechanisms of the bacterial community in karst river waters.

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“…For example, Wang et al (2020) found that homogeneous selection had a relatively higher importance in shaping bacterioplankton in the FL fraction, while this process was more important in structuring archaeaplankton of the PA fraction. By contrast, other studies reported that stochastic processes played a larger role in shaping both the FL and PA communities (Gweon et al, 2021;Shi et al, 2022). However, previous studies of marine microbial community assembly have mainly focused on a single habitat and few involve different habitats in a single study.…”

Section: Introductionmentioning

confidence: 93%

Comparison of assembly process and co-occurrence pattern between planktonic and benthic microbial communities in the Bohai Sea

et al. 2022

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Unraveling the mechanisms structuring microbial community is a central goal in microbial ecology, but a detailed understanding of how community assembly processes relate to living habitats is still lacking. Here, via 16S rRNA gene amplicon sequencing, we investigated the assembly process of microbial communities in different habitats [water verse sediment, free-living (FL) verse particle-associated (PA)] and their impacts on the inter-taxa association patterns in the coastal Bohai Sea, China. The results showed clear differences in the composition and diversity of microbial communities among habitats, with greater dissimilarities between water column and sediment than between FL and PA communities. The microbial community assembly was dominated by dispersal limitation, ecological drift, and homogeneous selection, but their relative importance varied in different habitats. The planktonic communities were mainly shaped by dispersal limitation and ecological drift, whereas homogeneous selection played a more important role in structuring the benthic communities. Furthermore, the assembly mechanisms differed between FL and PA communities, especially in the bottom water with a greater effect of ecological drift and dispersal limitation on the FL and PA fractions, respectively. Linking assembly process to co-occurrence pattern showed that the relative contribution of deterministic processes (mainly homogeneous selection) increased under closer co-occurrence relationships. By contrast, stochastic processes exerted a higher effect when there were less inter-taxa connections. Overall, our findings demonstrate contrasting ecological processes underpinning microbial community distribution in different habitats including different lifestyles, which indicate complex microbial dynamic patterns in coastal systems with high anthropogenic perturbations.

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Contrasting community assembly processes structure lotic bacteria metacommunities along the river continuum

Cited by 87 publications

References 118 publications

Assembly processes and source tracking of planktonic and benthic bacterial communities in the Yellow River estuary

Assembly processes and source tracking of planktonic and benthic bacterial communities in the Yellow River estuary

Deterministic processes shape bacterial community assembly in a karst river across dry and wet seasons

Comparison of assembly process and co-occurrence pattern between planktonic and benthic microbial communities in the Bohai Sea

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