Kim Jeong-Hui, Park Sang-Hyeon, Baek Seung-Ho, Jang Min-Ho, Yoon Ju-Duk
EcoResearch Incorporated, Gongju 32588, Korea.
Department of Marine Fisheries Resources, Mokpo National University, Mokpo 58554, Korea.
Animals (Basel). 2020 Dec 17;10(12):2424. doi: 10.3390/ani10122424.
To investigate movement patterns and diel activities of in the freshwater ecosystem, we applied acoustic telemetry on in the Geum River, a large river in South Korea. The acoustic tags were attached on 19 individuals of (12 with a depth sensor) in May and October 2015 and tracked at approximately 100-km sections from an estuary barrage by 20 automatic listening stations. Only four individuals showed longitudinal movement (mean, 5.2 km), and others were detected by the receivers at release sites; therefore, showed high site fidelity. We did not identify seaward migration during the study period (May to November). Conversely, showed active diel movement. The number of detections ( = 0.002) and movement distance ( = 0.004) were higher at night-time (18:00-06:00). As most individuals were actively moving at nighttime, we confirmed that is nocturnal, although few individuals also showed daytime movement. Although the population and habitats of have been decreasing simultaneously, the East-Asian countries are still severely exploiting rivers and streams to use water resources, and result in habitat simplification generated. Therefore, these results contribute to effective management regarding habitat and population conservation and restoration.
为了研究淡水生态系统中[物种名称]的运动模式和昼夜活动，我们在韩国一条大河锦江中的[物种名称]身上应用了声学遥测技术。2015年5月和10月，在19只[物种名称]个体（12只带有深度传感器）身上附着了声学标签，并通过20个自动监听站在距河口拦河坝约100公里的河段进行跟踪。只有4只个体表现出纵向移动（平均5.2公里），其他个体在放生地点被接收器检测到；因此，[物种名称]表现出高地点保真度。在研究期间（5月至11月），我们未发现向海洄游现象。相反，[物种名称]表现出活跃的昼夜移动。夜间（18:00 - 06:00）的检测次数（= 0.002）和移动距离（= 0.004）更高。由于大多数个体在夜间活跃移动，我们确认[物种名称]是夜行性的，尽管也有少数个体表现出白天移动。尽管[物种名称]的种群和栖息地一直在同时减少，但东亚国家仍在严重开发河流和溪流以利用水资源，并导致栖息地简化。因此，这些结果有助于在栖息地和种群保护与恢复方面对[物种名称]进行有效管理。
