台灣中部森林領角鴞繁殖生物學初探

The Breeding Biology of the Collared Scops Owls (Otus lettia) in Forest Environment of Central Taiwan

林文隆(Wen-Loung LlN)

《台灣猛禽研究》 1期 (2003/09) Pp. 29-35

https://doi.org/10.30121/RRT.200309.0004

摘要

研究期間（1995－1996年、1999－2002年）在台灣中部森林共記錄20隻以樹洞繁殖的領角鴞（Otus lettia）。領角鴞繁殖時間分別在3月、4月與7月，但以3月繁殖巢數較多（n=12）。每巢卵數平均為4.0±0.8個，受精卵所需的孵化時間平均為27.8±1.8天（n=10）。每巢平均有2.9±1.2隻幼雛順利孵出，孵化率為72.5%，平均有1.6±1.4隻幼鳥成功離巢，離巢率為55.2%。成功離巢幼鳥待在巢區的平均時間為32.1±5.2天（n=32）。20潮領角鴞中有13巢至少有1隻幼鳥成功離巢，7巢繁殖失敗，整體繁殖成功率為65.0%。影響領角鴞繁殖成敗的因素中，以天敵的比率最高（33.3%），其餘依序為卵未受精（31.3%）、不明（14.6%）、棄巢（8.3%）、墜巢與飢餓（6.3%）。

關鍵字

領角鴞 ； 巢卵數 ； 孵化率 ； 離巢率 ； 繁殖成功率

並列摘要

Twenty nests of Collared Scops Owls(Otus lettia) breeding in tree holes in forest environments of central Taiwan were observed from 1995 to 1996 and 1999 to 2002. Breeding was more common in March(n=12), and rare in April and July. Average clutch size was 4.0∘”0.8eggs; the average incubation period was 27.8∘”1.8 days(n=10); 2.9∘”1.2 chicks hatched in each nest; and the average hatching tate was 72.5%. An average of 1.6∘”1.4 fledglings successfully left the nest and remained in the area of the nests for a period of 32.1∘”5.2 days(n=32). The success rate of leaving the nest was 55.2%. There was at least 1 fledgling which successfully left the nest in 13 of 20 nests. The other 7 nests failed to produce any fledglings. The breeding success rate was 65.0%. The major factors affecting breeding success were natural enemies of eggs(33.3%), lack of fertilization(33.1%), uncertain factors(14.6%), abandonment(8.3%), and falling from the nest and starving(6.3%).

並列關鍵字

Collared Scops Owl ； clurch size ； harching rate ； fledgling leaving rate ； breeding success rate