Disproportionate responses between free-living and particle-attached bacteria during the transition to oxygen-deficient zones in the Bohai Seawater

Zhao, Duo; Gao, Ping; Xu, Le; Qu, Lingyun; Han, Yuge; Zheng, Liwen; Gong, Xianzhe

doi:10.1016/j.scitotenv.2021.148097

Cited by 24 publications

(7 citation statements)

References 78 publications

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“…It is worth mentioning that camping changed the niche space of microorganisms. The lower abundance of the aerobic genus LD29 ( Zhao et al, 2021 ) and higher abundance of the anaerobic genus OLB13 and Rummeliibacillus under camping compared to under no camping suggested a hypoxic environment under camping. This may reflect previous findings that camping and trampling reduced soil air permeability and caused soil hypoxia ( Hou et al, 2004 ).…”

Section: Discussionmentioning

confidence: 99%

Herbivore camping reshapes the taxonomy, function and network of pasture soil microbial communities

Wang

Ding

Li³

et al. 2022

PeerJ

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Although the effects of herbivore camping on soil physicochemical properties have been studied, whether the effects alter the soil microbial communities (e.g., composition, functions, taxonomic and functional diversities, network) remain unknown, especially below the surface. Here, using paired subsoil samples from half month-camping and non-camping, we showed for the first time that camping significantly changed the relative abundance of 21 bacterial phylotypes and five fungal phylotypes. Specifically, we observed significant increases in the relative abundance of putative chitinase and terpenes vanillin-decomposition genes, nitrite reduction function (nirB, nasA), decreases in the relative abundance of putative carbon fixation genes (ackA, PGK, and Pak), starch-decomposition gene (dexB), gene coding nitrogenase (anfG), and tetracycline resistance gene (tetB) for bacterial communities, and significant decreases in the relative abundance of animal endosymbiont and increases in the relative abundance of litter saprotroph and endophyte for fungal communities. However, camping did not significantly impact the taxonomic and functional diversity. The niche restriction was the main driving force of bacterial and fungal community assembly. Compared to no camping, camping increased the stability of bacterial networks but decreased the stability of fungal networks. Camping exerted a positive effect on the network by compressing the niche width and reduced the change in the network by reducing the niche overlap. Our results suggest that camping restructures the soil microbial composition, function, and network, and provides a novel insight into the effect of animal camping on soil microbial communities in grassland.

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Section: Discussionmentioning

confidence: 99%

Herbivore camping reshapes the taxonomy, function and network of pasture soil microbial communities

Wang

Ding

Li³

et al. 2022

PeerJ

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“…In line with some studies in the BS ( Chen et al, 2020 ; Guo et al, 2022 ; Wu et al, 2022 ), Proteobacteria , Bacteroidetes , and Cyanobacteria were found to be dominant groups and were abundant in both water and sediments. These groups have been characterized as the important groups in eutrophic coastal ecosystems ( Klawonn et al, 2016 ; Gomes et al, 2019 ; Zhang et al, 2019 ; Zhao et al, 2021 ). However, clear differences in the relative abundance of several dominant microbial phyla were seen between water and sediment samples.…”

Section: Discussionmentioning

confidence: 99%

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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“…A previous study revealed that a high-density diet decreased ruminal bacteria richness and evenness [ 32 ], and the current study found similar results, since the dietary energy and protein in Pre were higher than in Post. Zhao et al [ 50 ] reported higher Actinobacteriota abundance when the concentration of oxygen decreased, probably explaining the trending decline of this phylum in Post because more roughage could carry more oxygen into the rumen [ 51 ]. The genus Prevotella is involved in fermenting starch and degrading protein [ 52 ], which partly explains its higher abundance in Pre due to its higher dietary protein and energy density.…”

Section: Discussionmentioning

confidence: 99%

Diet Shift May Trigger LuxS/AI-2 Quorum Sensing in Rumen Bacteria

Xiao

Long

et al. 2022

Bioengineering

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Recent studies have revealed that LuxS/AI-2 quorum sensing (QS) is the most universal cell-to-cell communication in rumen bacteria; however, it remains unknown how they respond to nutritional stress from a diet shift. This study aimed to explore whether a diet shift could trigger rumen bacterial LuxS/AI-2 QS and its influences on rumen fermentation characteristics and bacterial community diversity and composition. A total of fifteen Hu sheep were selected to undergo a pre-shift diet (Pre, concentrate to forage ratio 75:25) for one month and then abruptly switch to a post-shift diet (Post, concentrate to forage ratio 49:51). Results showed that the serum cortisol and immunoglobulin G concentrations were higher in Post than in Pre (p < 0.05). The microbial density, AI-2 concentration, biofilm formation, and gene expression of ftsH were higher in Post when compared with Pre (p < 0.05), whilst the expression of luxS tended to be lower in Post (p = 0.054). The molar concentration of valerate and fermentation efficiency decreased after the diet shift, while the acetate to propionate ratio and the molar proportion of butyrate were higher in Post compared to Pre (p < 0.05). Moreover, the diet shift increased the richness of ruminal bacteria and the relative abundance of Roseburia, and decreased the relative abundances of Prevotella, Megasphaera, Dialister, Prevotellaceae UCG-001, and Lachnospira (p < 0.05). A difference in trends was also observed in an analysis of similarity (R = 0.1208 and p = 0.064). This study suggests that a diet shift could trigger rumen bacterial LuxS/AI-2 QS by altering microbial density, AI-2 concentration, biofilm formation, and related gene expression, as well as affect the rumen fermentation pattern and bacterial community diversity and composition. This study may provide insight into a potential strategy for relieving nutritional stress via regulating bacterial communication.

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Disproportionate responses between free-living and particle-attached bacteria during the transition to oxygen-deficient zones in the Bohai Seawater

Cited by 24 publications

References 78 publications

Herbivore camping reshapes the taxonomy, function and network of pasture soil microbial communities

Herbivore camping reshapes the taxonomy, function and network of pasture soil microbial communities

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

Diet Shift May Trigger LuxS/AI-2 Quorum Sensing in Rumen Bacteria

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