Dynamics of bacterial communities during a seasonal hypoxia at the Bohai Sea: Coupling and response between abundant and rare populations

Wu, Chao; Kan, Jinjun; Narale, Dhiraj Dhondiram; Liu, Kun; Sun, Jun

doi:10.1016/j.jes.2021.04.013

Cited by 14 publications

(9 citation statements)

References 57 publications

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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 ).…”

Section: Discussionsupporting

confidence: 87%

“…The increasing anthropogenic activities have caused serious ecological problems to the BS, such as eutrophication, algal blooms, and hypoxia in the bottom water (Song et al, 2016;Zhai et al, 2019;Zheng et al, 2020). Consistently, microbial communities in the BS have been influenced by hypoxia (Wu et al, 2022), river input (Wang et al, 2021), and heavy metals (Ming et al, 2021). However, the microbial assembly pattern in this highly disturbed ecosystem is largely unknown.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Discussionsupporting

confidence: 87%

Section: Introductionmentioning

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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“…In the present study, temperature and salinity were major factors to determine the distribution of bacterial communities. This agreed well with previous studies in many other oceans such as the South China Sea and the Bohai Sea (Zhang et al, 2011;Wu et al, 2022a). Notably, silicate was also the major factor to influence the distribution of bacterial communities in our study.…”

Section: Distribution Of Bacterial Communities In the Bay Of Bengal D...supporting

confidence: 93%

“…The 16S rRNA gene data were analyzed in the BMK Cloud. 1 The detailed procedure of the bioinformatics analysis for the 16S rRNA gene is given in Wu et al (2022a) . For nif H gene analysis, the raw sequence data were first quality filtered to remove low-quality tags.…”

Section: Methodsmentioning

confidence: 99%

Diversity, structure, and distribution of bacterioplankton and diazotroph communities in the Bay of Bengal during the winter monsoon

Narale

Cui

et al. 2022

Front. Microbiol.

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The Bay of Bengal (BoB) is conventionally believed to be a low productive, oligotrophic marine ecosystem, where the diazotroph communities presumed to play a vital role in adding “new” nitrogen through the nitrogen fixation process. However, the diazotroph communities in the oceanic region of the BoB are still poorly understood though it represents most of the seawater volume. The present study investigated a detailed account of the bacterioplankton community structure and distribution in the oceanic BoB during the winter monsoon using high throughput sequencing targeting the 16S rRNA and nifH genes. Our study observed diverse groups of bacterioplankton communities in the BoB including both cyanobacterial and non-cyanobacterial phylotypes. Cyanobacteria (Prochlorococcus spp. and Synechococcus spp.) and Proteobacteria (mainly α-, γ-, and δ-Proteobacteria) were the most abundant groups within the bacterial communities, possessing differential vertical distribution patterns. Cyanobacteria were more abundant in the surface waters, whereas Proteobacteria dominated the deeper layers (75 m). However, within the diazotroph communities, Proteobacteria (mainly γ-Proteobacteria) were the most dominant groups than Cyanobacteria. Function prediction based on PICRUSt revealed that nitrogen fixation might more active to add fixed nitrogen in the surface waters, while nitrogen removal pathways (denitrification and anammox) might stronger in deeper layers. Canonical correspondence analysis (CCA) indicated that temperature, salinity, and silicate were major environmental factors driving the distribution of bacterial communities. Additionally, phosphate was also an important factor in regulating the diazotroph communities in the surface water. Overall, this study provided detailed information on bacterial communities and their vital role in the nitrogen cycles in oligotrophic ecosystems.

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“…The 16S rRNA gene sequencing of these samples has been reported by previous study in our lab (Wu et al, 2022). According to previous report, a total of 3,043 OTUs were obtained in these samples of this region.…”

Section: Pathogenic Bacteria Diversity and Richnessmentioning

confidence: 70%

Pathogenic bacteria significantly increased under oxygen depletion in coastal waters: A continuous observation in the central Bohai Sea

Guo

Sun

2022

Front. Microbiol.

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The spread of pathogenic bacteria in coastal waters endangers the health of the local people and jeopardizes the safety of the marine environment. However, their dynamics during seasonal hypoxia in the Bohai Sea (BHS) have not been studied. Here, pathogenic bacteria were detected from the 16S rRNA gene sequencing database and were used to explore their dynamics and driving factors with the progressively deoxygenating in the BHS. Our results showed that pathogenic bacteria were detected in all samples, accounting for 0.13 to 24.65% of the total number of prokaryotic sequences in each sample. Pathogenic Proteobacteria was dominated in all samples, followed by Firmicutes, Actinobacteria, Tenericutes, and Bacteroidetes, etc. β-diversity analysis showed that pathogenic bacteria are highly temporally heterogeneous and regulated by environmental factors. According to RDA analysis, these variations may be influenced by salinity, ammonia, DO, phosphate, silicate, and Chl a. Additionally, pathogenic bacteria in surface water and hypoxia zone were found to be significantly separated in August. The vertical distribution of pathogenic bacterial communities is influenced by several variables, including DO and nutrition. It is noteworthy that the hypoxia zones increase the abundance of certain pathogenic genera, especially Vibrio and Arcobacter, and the stability of the pathogenic bacterial community increased from May to August. These phenomena indicate that the central Bohai Sea is threatened by an increasingly serious pathogenic community from May to August. And the developing hypoxia zone in the future may intensify this phenomenon and pose a more serious threat to human health. This study provides new insight into the changes of pathogenic bacteria in aquatic ecosystems and may help to make effective policies to control the spread of pathogenic bacteria.

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Dynamics of bacterial communities during a seasonal hypoxia at the Bohai Sea: Coupling and response between abundant and rare populations

Cited by 14 publications

References 57 publications

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

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

Diversity, structure, and distribution of bacterioplankton and diazotroph communities in the Bay of Bengal during the winter monsoon

Pathogenic bacteria significantly increased under oxygen depletion in coastal waters: A continuous observation in the central Bohai Sea

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