This study examined the relationships between acoustic activity of the finless porpoise (Neophocaena asiaeorientalis) and marine environmental variables in Hadong, in the southern coast of Korea, using long-term passive acoustic monitoring. Acoustic data were collected with a hydrophone (F-POD) from July 8 to August 16 2023, and acoustic indices (DPM, DP10M, and click-based metrics) were integrated with in situ observations and model analysis environmental data. Generalized additive models indicated that chlorophyll-a and dissolved oxygen were the main predictors of acoustic activity whereas physical oceanographic variables (temperature, salinity, and sea surface height) had no significant effects. Chlorophyll-a showed a strong non-linear positive effect with finless porpoise activity increasing rapidly up to approximately 2 mg/m³ and then reaching a plateau. Dissolved oxygen exhibited a negative linear relationship, implying indirect ecological effects mediated by prey availability. In addition, current velocity was negatively related to click intensity. These results indicate that finless porpoise habitat use is more closely associated with productivity-related factors than with physical conditions. This research offers quantitative insights into prey-driven habitat selection, supporting the development of management and bycatch mitigation strategies.

서 론
재료 및 방법
    현장 조사
    음향 자료 분석
    해양환경 자료
    통계 분석
결과 및 고찰
    상괭이 음향 활동
    해양환경 결과
    GAM 모델링 결과
    기존 연구와의 비교 분석
    해양환경과 해양포유류 출현 간의 관계
결 론
사 사
References

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• 정지훈(경상국립대학교 대학원 해양경찰시스템학과 학생) | Jihoon JUNG (Student, Department of Maritime Police and Production System, Graduate School, Gyeongsang National University, Tongyeong 53064, Korea)
• Fredrich Simanungkalit(경상국립대학교 대학원 해양경찰시스템학과 학생) | Fredrich SIMANUNGKALIT (Student, Department of Maritime Police and Production System, Graduate School, Gyeongsang National University, Tongyeong 53064, Korea)
• 윤은아(제주대학교 해양산업경찰학과 교수) | Euna YOON (Professor, Department of Marine Industry and Maritime Police, Jeju National University, Jeju 63243, Korea)
• 김현영(국립수산과학원 수산공학과 연구관) | Hyunyoung KIM (Senior researcher, Fisheries Engineering Division, National Institute of Fisheries Science, Busan 46083, Korea)
• 강명희(경상국립대학교 해양경찰시스템학과 교수) | Myounghee KANG (Professor, Department of Maritime Police and Production System, Gyeongsang National University, Tongyeong 53064, Korea) Corresponding author