한국에 월동하는 독수리의 비행 행동 특성 분석
Flight behavior of cinereous vultures (Aegypius monachus) in the wintering season in Korea
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초록
독수리 11개체에 GPS를 부착하여 비행특성을 분석하였다. 한국에 월동기간은 평균 131일 (SD=17.4)이었고, 평균 비상 비율은 19.6%이었다. 비행고도는 100 m 이하가 21.6%이었으며, 101~200 m는 25.3%, 201~300 m는 19.0%로, 300 m 이하가 65.9%이었다. 시간대별 비상률과 고도는 양의 상관관계 (r=0.929)를 보였고, 월별 비행고도 비율은 대부분 101~200 m에 가장 많은 비율을 나타냈다(p<0.05). 월동기 독수리는 비행비율을 낮추고 300 m 이하 고도에서 비행하였다. 독수리의 넓은 행동권, 높은 비행비율, 높은 고도 비행특성은 사회적 상호작용에 의해 먹이를 찾는 효율적인 비행방법으로 판단된다.
Abstract
The flight characteristics of 11 cinereous vultures (Aegypius monachus) were analyzed by a global positioning system (GPS) tracker (WT - 300; KoEco, Inc.). The wintering period in Korea averaged 131 days (SD=17.4) and the average flight rate was 19.6%. The flight altitude was below 100 m for 21.6% of the flight, 101-200 m for 25.3%, 201-300 m for 19.0%, and below 300 m for 65.9%. There was a positive correlation (r=0.929) between the hourly flight rate and altitude. The predominant monthly flight altitude was 101-200 m (p<0.05). The wintering cinereous vultures lowered their flight rate and flew at an altitude of less than 300 m. This is thought to be an efficient way to find food through social interaction.
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