| Summary: | 碩士 === 國立屏東科技大學 === 野生動物保育研究所 === 103 === This research used the echo image of Doppler weather radar to analyze the migration behavior of migratory Chinese Sparrow Hawk (Accipiter soloensis) in September 2014 on Hengchun Peninsula. We measured and recorded the pattern such as flyways, flock size and dimesion, arrivial time, flight altitude and speed, and wind condition. We further compared these data with ground observation and result of 2005 to examine possible reason of the dramtically decreasing bird count indicated by ground observation in September of 2004. During the study period, radar images showed 139 flocks with size ranging from 163 to 9,734 birds. A total of 20,5267 sparrow hawks were estimtated by radar, and among them 73.82％ migrated by land via Eluanbi and Mobitou while 26.18％ by sea, with a few passed though western peninsula, which was never found before. My reuslt showed that ground observers underestimated the bird number by 56.38% (115,737 birds). Temporal omission accounts for 49.24% of all omissions. Flock size between 1000 and 3000 birds accounts for 51.08 ％ of all flocks. The species arrived from 6:00 to 15:00 with number peaking at 8:00 and 9:00 for land route and sea route, respectively. The minimum flock altitude observed when flock were shown on the radar image ranged from 42.08 m to 140.6 m and the maximum flock altitude ranged from 41.73 m to 332.4 m when leaving radar image. The bird flew with speed of 31.19 to 78.64 km/hr. Most flock moved under tailwind direction.
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