Effects of Escherichia pollution and salinity on nutrient levels in submerged vegetated wetlands: Insights into benthic community stability and metabolisms

Autor: Jia-yun Chen, Jian-yi Wu, Run-yang Xu, Zu-lin Hua, Li Gu
Jazyk: angličtina
Rok vydání: 2023
Předmět:
Zdroj: Water Science and Technology, Vol 87, Iss 5, Pp 1187-1201 (2023)
Druh dokumentu: article
ISSN: 0273-1223
1996-9732
DOI: 10.2166/wst.2023.046
Popis: Inner coastal wetland ecosystems are generally eutrophic and are often exposed to both salinity stress and Escherichia coli pollution. However, the effects of these stressors on nutrient-cycling and microbial communities are under-researched. Here, we established a vegetated wetland ecosystem in a saline environment to understand the effects of E. coli pollution on nutrient removal and benthic microorganisms. The results show that E. coli significantly inhibited nutrient removal, especially total nitrogen (TN) and ammonium (78.89–84.98 and 3.45–44.65% were removed from the non-E. coli-treated and the E. coli-treated water, respectively). Compared with non-vegetated systems, archaeal community variations at both compositional and phylogenetic levels were weakened in vegetated systems (p < 0.05). Among all the environmental factors, the ratios of PO43--P to total phosphorus and NO3--N to TN contributed the most to archaeal and bacterial community structural variations, respectively. E. coli pollution affected archaeal community succession more than bacteria (p < 0.05). E. coli also weakened the trophic transferring efficiencies between Cyanobacteria and Myxobacteria (p < 0.05). Metabolically, E. coli inhibited bacterial genetic metabolic pathways but made human infection more likely (p < 0.05). Our findings provide new insights into aquatic ecological conservation and environmental management. HIGHLIGHTS The removal of TN and was significantly inhibited by E. coli.; Submerged vegetation weakened the archaeal community variations caused by E. coli.; Submerged vegetation enhanced the bacterial community variations caused by E. coli.; E. coli pollution affected archaeal community succession than bacteria.; E. coli weakened trophic transfers between Cyanobacteria and Myxobacteria.;
Databáze: Directory of Open Access Journals
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