plSSN : 0374-8111 | elSSN : 2287-8815
plSSN : 0374-8111 | elSSN : 2287-8815
plSSN : 0374-8111elSSN : 2287-8815
Variations in Bacterial Groups and Antimicrobial Resistance Characteristics with Changing Environmental Inland Pollution Sources in the Southern Coastal Area of Ganghwa Island, South Korea
정연겸·박보미1·김지윤·김영주·황진익·오은경*
국립수산과학원 서해수산연구소, 1BioMérieux Korea Co., Ltd.
This study investigated the seasonal dynamics of bacterial communities and antimicrobial resistance in the southern coastal waters of Ganghwa Island, South Korea. Twelve samples were collected seasonally from three inland pollution sources (sites 1-3) in2021. High concentrations of total and fecal coliforms were detected at all sites, with site 1 showing the highest levels (5,400,000 and 2,300,000 MPN/100 mL, respectively). In total, 264 gram-negative bacteria were isolated, including as the dominant genera Escherichia spp., Klebsiella spp., and Pseudomonas spp.. Antimicrobial resistance analysis revealed site- and season-specific variations. The lowest resistance rates were observed in November (site 1), April (site 2), and August (site 3). Seasonal variations were evident in the resistance profiles and multiple antimicrobial resistance (MAR) indices, with the lowest MAR rates recorded in November. More than 50% of the isolates collected in February, April, and August showed resistance to five key antimicrobials, including ampicillin and ceftiofur. These results suggest that inland pollution sources contribute to the dissemination of antimicrobial-resistant bacteria in adjacent coastal environments and that seasonal environmental changes may influence resistance patterns. These findings provide valuable baseline data inform the management of inland pollution, enhance seafood hygiene practices, and safeguard the health of marine ecosystems.
Antimicrobial resistance, Bacterial groups, Gram-negative bacteria, Inland pollution source, Multi antimicrobial resistance