Linking Antibiotic Residues and Antibiotic Resistance Genes to Water Quality Parameters in Urban Reservoirs: A Seasonal Perspective

Environments, Journal Year: 2025, Volume and Issue: 12(3), P. 96 - 96

Published: March 18, 2025

The interaction between antibiotics and antibiotic resistance genes (ARGs) in freshwater ecosystems has become a critical environmental concern. This study investigates seasonal variations of sulfonamide tetracycline their relationship with ARGs three urban reservoirs Nanjing, China: Pingshan Forest Park, Shanhu Lake Wetland Zhaoqiao Reservoir. Sampling was conducted May September 2023 to assess water quality, concentrations, ARG abundance. A total 30 samples were analyzed regard physicochemical parameters, heavy metals, antibiotics. quantitative PCR assay used measure the abundance relative 16S rRNA gene. Sulfonamide concentrations ranged from 120 ng/L, while tetracyclines 50–160 ng/L. Notably, sulfamethazine decreased significantly two (Shanhu Zhaoqiao, p < 0.05), other showed minimal variation, indicating persistent contamination agricultural runoff wastewater discharge. lower than September, being cumulatively genes. Strong correlations (r > 0.7) observed parameters like dissolved oxygen pH. High levels areas without nearby hospitals or pharmaceutical companies, implicating agriculture as major pollution source. By analyzing across eutrophic China, we highlight drivers proliferation propose targeted mitigation strategies.

Language: Английский

---

A comprehensive analysis of tracing the sources and dynamics of pollutants in a tropical Miri River, NW Borneo

Sustainable Water Resources Management, Journal Year: 2025, Volume and Issue: 11(2)

Published: Feb. 12, 2025

Abstract The fractionation and distribution of elemental composition in water (particulate colloid) sediments were assessed to understand the major geochemical processes that control contaminant transport Miri River, NW Borneo. Further, study also focused on determining potential sources elements assessing ecological risk. In this regard, 11 surface 35 river bed sediment samples collected along course River analyzed for various compositions. Pollution indices such as geo-accumulation index (I geo ) contamination factor (CF) used determine pollution status river. Principal component analysis (PCA) was identify key metal its sources. interpretation results indicates size fractions showed an increasing concentration trend from colloidal particulate fraction. Fe observed be dominant both sediments, indicating weathering sediments. Cd, Pb Zn are mostly derived anthropogenic impacts risk evaluation indicate probability adverse threats riverine biota. Colloidal (0.30 µm 0.20 µm) identified primary facilitators transport, particularly upstream midstream, whereas (0.45 dominates downstream due tidal influx seawater. PCA confirmed majority pollutants contributed by domestic industrial discharge, seawater incursion, geogenic agricultural inputs.

Language: Английский

---

Impact of Drought on the Aquatic Ecosystem of the Cascade Dam Reservoir in South Korea

Water, Journal Year: 2025, Volume and Issue: 17(7), P. 1023 - 1023

Published: March 31, 2025

Climate change has increased the frequency and intensity of extreme weather events worldwide. In South Korea, annual precipitation in 2014–2015 was only 50% long-term average, resulting severe drought conditions. This extended water residence time dam reservoirs, enhancing internal nutrient recycling, degrading quality, promoting harmful cyanophyta blooms downstream reservoirs. Using Standardized Precipitation Index—for assessment, monthly sampling—for environmental factors phytoplankton analyses, this study examined impacts on quality communities a series interconnected reservoirs (Uiam, Cheongpyeong, Sambong-ri, Paldang Lakes) within Bukhan River system from 2013 to 2016. The prolonged during facilitated accumulation recycling intensifying eutrophication deterioration, alongside pronounced cyanobacterial dominance algal blooms. These findings suggest that changes upstream discharges directly influence ecosystem health diverse hydrological associated with pose significant threat source management. may inform development integrated management strategies for maintaining protecting sources droughts climatic events.

Language: Английский

---

Spatiotemporal patterns of groundwater over South Korea

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 928, P. 172221 - 172221

Published: April 18, 2024

Language: Английский

---