Insight into variation and controlling factors of dissolved organic matter between urban rivers undergoing different anthropogenic influences

Ifon, Binessi Edouard; Adyari, Bob; Hou, Liyuan; Zhang, Lanping; Liao, Xin; Peter, Philomina Onyedikachi; Rashid, Abbas; Yu, Chang‐Ping; Hu, Anyi

doi:10.1016/j.jenvman.2022.116737

Cited by 13 publications

(3 citation statements)

References 46 publications

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“…3 ). Heavy rainfall significantly impacted water quality parameters 51 , including micropollutants, as indicated by the explanatory power of temporal changes in our SEM results ( Fig. 3c ).…”

Section: Discussionmentioning

confidence: 60%

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Strong cascading impacts of micropollutants on planktonic food web in urban river

Adyari,

Zhang,

Nascimento

et al. 2023

Preprint

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Urban rivers rely on intricate multitrophic interactions in food webs, which are vital for ecological functions. Human-induced pollutant discharge, notably micropollutants, poses a threat to these interactions. To study the impact of micropollutants on the microbial food web, we sampled downstream areas of the Jiulong River’s north tributary (lower urbanization, ∼25% built land) and west tributary (higher urbanization, ∼65% built land) for eleven consecutive days in both dry and wet seasons in Fujian, China. We constructed a conceptualized planktonic food web model by employing DNA metabarcoding targeting bacteria, micro-eukaryotes (algae and protozoa), and microzooplankton. Our results revealed that the more urbanized west tributary exhibited significantly higher micropollutant concentrations. Structural equation modeling (SEM) incorporating micropollutants and all food web elements indicated a significantly stronger impact of micropollutants on the planktonic food web in the west tributary than in the north tributary. Micropollutants exhibited both direct and indirect (cascade) effects on high trophic levels (protozoa and microzooplankton), with algal communities mediating the cascade effects instead of bacterial communities, likely due to the increased eutrophication in the urbanized tributary. Overall, our study underscores the potential ecological disruptions caused by micropollutants in shaping planktonic food web interactions in urban rivers.SynopsisUrban rivers face ecological threats from micropollutants. This study shows elevated micropollutants significantly affected the planktonic food webs. Algal, rather than bacterial, food web pathway mediated micropollutants cascading effects on high trophic levels, emphasizing micropollutant-induced disruptions in urban rivers.

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Section: Discussionmentioning

confidence: 60%

“…5 ). We propose that the elevated concentration of nutrients and dissolved organic matter, 51 characteristic of eutrophic ecosystems in the west tributary, creates a more favorable environment for algae growth. This is supported by significantly higher chlorophyll-a concentration ( Fig.…”

Section: Discussionmentioning

confidence: 99%

Strong cascading impacts of micropollutants on planktonic food web in urban river

Adyari,

Zhang,

Nascimento

et al. 2023

Preprint

Self Cite

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“…The components of COM in this study were measured using the fluorescence region intensity method (Figure 2d). The three-dimensional fluorescence spectrum was divided into five integral regions to characterize aromatic protein substances, other aromatic protein subclasses, fulvic acid-like substances, soluble microbial metabolites, and humic acid-like substances separately [44][45][46]. Compared to the low turbidity colloids, medium and high turbidity colloids presented more fulvic and humic acid-like substances, and medium turbidity colloids contained the highest soluble microbial metabolites.…”

Section: Occurrence Characteristics Of Lmw Colloids Under Different T...mentioning

confidence: 99%

Colloidal Filterable Bacteria Enhance Ammonia Nitrogen Enrichment in River Colloids under Different Turbidity Conditions: Bacterial Diversity, Assembly Mechanism, and Nitrogen Transformation

Niu,

Chen,

et al. 2024

Water

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Turbidity has been one of the most typical problems in urban rivers, accompanied by eutrophication. Though the colloid is a nonnegligible factor associated with turbidity and nutrient enrichment in urban rivers, the characteristics of nitrogen enrichment and bacterial communities of colloids under different turbidity conditions of urban rivers have not been well understood. In this study, colloids of low and high molecular weights (LMW, 30 kDa–0.2 μm, and HMW, 0.2–1 μm) were separately collected from the bulk water (<1 μm) of several typical urban rivers in China. Since the colloidal concentration presented the significantly highest correlation with turbidity, colloidal characteristics were further explored under three turbidity gradients with two cutoffs of 10 and 30 NTU. Results showed that colloidal organic matter in medium and high turbidity rivers was mainly sourced from the release of endogenous plankton and the proportion of colloidal organic carbon in dissolved organic carbon increased from 33% to 38% with increased turbidity. Colloidal ammonia nitrogen in medium turbidity accounted for the highest proportion (an average of 60%) in bulk water, which could be explained by the significantly positive correlation of colloidal ester groups and ammonia nitrogen (R2 = 0.47). Bulk water, HMW, and LMW colloids presented different dominant bacterial genera and LMW colloids also contained three unique dominant filterable genera: Flavobacterium, Acinetobacter, and Limnohabitans. LMW colloidal filterable bacteria under medium and high turbidities presented the greatest potential for dissimilatory nitrate reduction to ammonium, which might further enhance the enrichment of ammonia nitrogen in colloids. This study provides a primary understanding of the characteristics of colloids and colloidal bacterial communities in urban rivers from the perspective of turbidity and puts a new insight on the remediation of rivers under medium turbidity.

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Deciphering the molecular composition and sources of dissolved organic matter in urban rivers based on optical spectroscopy and FT-ICR-MS analyses

Ren,

Liu,

Liu

et al. 2024

Carbon Res.

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The components and sources of dissolved organic matter (DOM) in urban water bodies are extremely complicated due to multiple environmental and anthropogenic factors. The comprehensive analysis of the DOM molecular composition is crucial for deep understanding their reactivities, environmental behaviors, and fates in aquatic ecosystems, thereby improving our ability to monitor and protect aquatic systems. In this study, ultraviolet–visible spectroscopy (UV–Vis) and excitation-emission matrix fluorescence spectroscopy (EEM) were combined with Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR-MS) to investigate the optical and molecular characteristics of DOM in the Yongding River (YDH) and Beiyun River (BYH), two typical urban rivers with distinct landscapes and anthropogenic influences in Beijing, China. Results showed that DOM in BYH was mainly composed of proteins from microbial and sewage sources with low aromaticity, molecular weight, and abundant saturated labile compounds, along with a significant presence of anthropogenic surfactants. Whereas the YDH was primarily composed of humic substances from plant- and soil-derived terrestrials, with higher aromaticity humification, unsaturation and refractory compounds. In addition, due to the accumulation of refractory compounds, the concentration of DOC and the degree of organic pollution increased from upstream to downstream of the rivers, manifested as an increase in humification and molecular weight at the molecular level. Our results confirmed that landscape urbanization broadly modified the structure of DOM to be more aliphatic and saturated. The findings of this study will provide important insights into the chemdiverse molecular composition of DOM undergoing different influences from human activities and provide significant guidance for water quality management in urban river ecosystems. Graphical Abstract

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Insight into variation and controlling factors of dissolved organic matter between urban rivers undergoing different anthropogenic influences

Cited by 13 publications

References 46 publications

Strong cascading impacts of micropollutants on planktonic food web in urban river

Strong cascading impacts of micropollutants on planktonic food web in urban river

Colloidal Filterable Bacteria Enhance Ammonia Nitrogen Enrichment in River Colloids under Different Turbidity Conditions: Bacterial Diversity, Assembly Mechanism, and Nitrogen Transformation

Deciphering the molecular composition and sources of dissolved organic matter in urban rivers based on optical spectroscopy and FT-ICR-MS analyses

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