Particle‐attached microorganism oxidation of ammonia in a hypereutrophic urban river

Cai, Xiao-Qiu; Yao, Lei; Hu, Yuanyuan; Jiang, Hui; Shen, Mingdi; Hu, Quanman; Wang, Zixia; Dahlgren, Randy A.

doi:10.1002/jobm.201800599

Cited by 10 publications

(18 citation statements)

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“…Our results agree with previous research indicating that AOB communities are commonly tightly linked in ammonium-rich environments (Aalto et al, 2018;Hampel et al, 2018). These findings are also consistent with our previous study (Cai et al, 2019) and infer that AOB may play a more important role than AOA in this urban river network with high ammonia and low dissolved oxygen concentrations.…”

Section: Aoa and Aob Communities In The Hypereutrophic Urban River Networksupporting

confidence: 93%

“…High riverine nitrogen pollution is a widespread problem in the Wen-Rui Tang River, as in much of China, due to rapid socio-economic development, urbanisation, and lagging waste/storm water collection and treatment (Lu et al, 2011). Water quality of the Wen-Rui Tang River is characterised by high ammonia (>2 mg N/L), low dissolved oxygen (<4 mg/L), and high turbidity (>20 NTU) (Cai et al, 2018(Cai et al, , 2019. Thus, there is a critical need for research examining ammonia transport and transformations in the Wen-Rui Tang River network to provide fundamental knowledge of microbial ecological functions for management and remediation of eutrophic urban river systems.…”

Section: Introductionmentioning

confidence: 99%

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Properties of ammonia‐oxidising bacteria and archaea in a hypereutrophic urban river network

et al. 2021

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1. Ammonia oxidation by ammonia-oxidising archaea (AOA) and bacteria (AOB) is the first and rate-limiting step of nitrification. By providing substrate to the nitrogen-removing denitrification processes, nitrification is an important process for attenuation of allochthonous nitrogen loads in urban rivers, thereby mitigating eutrophication of downstream ecosystems. However, the relative importance of AOA and AOB communities in ammonia oxidation, the distribution and varied patterns of these groups and the underlying mechanisms have received limited study in hypereutrophic urban river networks.2. To investigate spatial and temporal patterns of particle-attached and free-living ammonia-oxidising microbial communities, we conducted a 2-year study of four different water quality/habitat conditions within a hypereutrophic urban river network of eastern China. The structure and dynamics of ammonia-oxidising microbial communities were determined by high-throughput sequencing based on the AOA and AOB amoA gene.3. We found significant spatial and temporal heterogeneity of ammonia-oxidising microbial communities, but no significant differences between particle-attached and free-living fractions. Analysis revealed that changes in the diversity and composition of ammonia-oxidising microbial communities were mainly related to substrate availability (e.g., ammonia, nitrite, dissolved oxygen). AOB communities were more complex and had a higher species richness and diversity compared with AOA communities. 4. Our findings indicate that high anthropogenic nitrogen loadings appear to promote higher ammonia-oxidising microbial richness and diversity, and AOB are more adaptable to the hypereutrophic conditions, thereby playing a more important role than AOA in nitrogen transformations in hypereutrophic urban river networks.5. This study highlights the importance of ammonia-oxidising microorganisms in nutrient-rich river systems and provides valuable insights into ammonia transport and transformations in urban river networks.

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Section: Aoa and Aob Communities In The Hypereutrophic Urban River Networksupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Properties of ammonia‐oxidising bacteria and archaea in a hypereutrophic urban river network

et al. 2021

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“…Thus, the high occurrence of OTU010/ASV0027/ASV0030 in KGF3_PA could be associated with the presence of highly liable POM (at KGF3) rather than contribution from the melt water inputs. Cai et al (2019) showed that members of MGI Ib, in particular, the genus Nitrososphaera of the family Nitrososphaeraceae were dominant in the particle-attached ammonia-oxidizing microbial communities. Recent studies have shown that particleattached MGI might be involved in the uptake and assimilation of ammonia (Li et al 2020) and organic compounds released via decomposition of organic particles (Alonso-Sáez et al 2012;Qin et al 2014).…”

Section: Phylogenetic Analysis Of Top 10 Otus and 20 Asvsmentioning

confidence: 99%

Marine Group-II archaea dominate particle-attached as well as free-living archaeal assemblages in the surface waters of Kongsfjorden, Svalbard, Arctic Ocean

Jain

Krishnan

2021

Antonie van Leeuwenhoek

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Marine archaea are a significant component of the global oceanic ecosystems, including the polar oceans. However, only a few attempts have been made to study archaea in the high Arctic fjords. Given the importance of Archaea in carbon and nitrogen cycling, it is imperative to explore their diversity and community composition in the high Arctic fjords, such as Kongsfjorden (Svalbard). In the present study, we evaluated archaeal diversity and community composition in the size-fractionated microbial population, viz-a-viz free-living (FL; 0.2–3 μm) and particle-attached (PA; > 3 μm) using archaeal V3–V4 16S rRNA gene amplicon sequencing. Our results indicate that the overall archaeal community in the surface water of Kongsfjorden was dominated by the members of the marine group-II (MGII) archaea, followed by the MGI group members, including Nitrosopumilaceae and Nitrososphaeraceae . Although a clear niche partitioning between PA and FL archaeal communities was not observed, 2 OTUs among 682 OTUs, and 3 ASVs out of 1932 ASVs were differentially abundant among the fractions. OTU001/ASV0002, classified as MGIIa, was differentially abundant in the PA fraction. OTU006/ASV0006/ASV0010 affiliated with MGIIb were differentially abundant in the FL fraction. Particulate organic nitrogen and C:N ratio were the most significant variables ( P < 0.05) explaining the observed variation in the FL and PA archaeal communities, respectively. These results indicate an exchange between archaeal communities or a generalist lifestyle switching between FL and PA fractions. Besides, the particles' elemental composition (carbon and nitrogen) seems to play an essential role in shaping the PA archaeal communities in the surface waters of Kongsfjorden. Supplementary Information The online version contains supplementary material available at 10.1007/s10482-021-01547-1.

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“…To sum up, although many research activities are currently conducted on the demolition of reinforced concrete structures, there are still many shortcomings that hinder wider use [18][19][20][21]. As a systematic crushing and dismantling method, microwaveassisted machinery is not only applicable to rock breaking [22,23] but can also be applied to the demolition in narrow urban spaces and to the demolition of special reinforced concrete structures. In the research on bond performance of reinforced concrete at high temperature, most specimens are heated in electric furnace at a slow heating rate and at low temperature gradient, and the corresponding results are mostly applied in fire protection [24].…”

Section: Introductionmentioning

confidence: 99%

An experimental study of damage characteristics at bond of RC after microwave heating

2021

JCE

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With an increase in urban construction waste, and in order to find an effective method of microwave-assisted mechanical RC regeneration, thermal damage characteristics of the interfacial bond between steel rebar and concrete after different microwave irradiations are analysed in this paper. The results show that, with an increase in microwave power, the overall failure mode of the specimen changes from splitting failure to pull-out failure. Bond slip curves and the corresponding fitting equations were obtained at various levels of microwave irradiation. By analysing characteristic points of the curve, 3500W was determined as a reasonable irradiation power.

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Particle‐attached microorganism oxidation of ammonia in a hypereutrophic urban river

Cited by 10 publications

References 48 publications

Properties of ammonia‐oxidising bacteria and archaea in a hypereutrophic urban river network

Properties of ammonia‐oxidising bacteria and archaea in a hypereutrophic urban river network

Marine Group-II archaea dominate particle-attached as well as free-living archaeal assemblages in the surface waters of Kongsfjorden, Svalbard, Arctic Ocean

An experimental study of damage characteristics at bond of RC after microwave heating

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