台灣中部中高海拔山區道路邊緣灰林鴞(Strix aluco)食性研究

The Diet of Tawny Owls (Strix aluco) Analyzed by Their Pellets on Roadsides in Mountain Areas of the Central Taiwan

林文隆(Wen-Loung Lin) ； 王穎(Yin Wang) ； 曾惠芸(Hui-Yun Tseng)

《特有生物研究》 9卷1期 (2007/01) Pp. 13-21

https://doi.org/10.7064/ESR.200701.0013

摘要

Pellets of tawny owls (Strix aluco) were collected on roadsides in the Central Mountain Range at elevations of 1,479m to 2,650m in the central Taiwan, 2000 and 2005. For 180 pellets collected, the sizes were 5.87±1.40 (mean±SE) cm in length, 3.42±0.72 cm in width, and 2.62±0.42 cm in depth. A total of 544 prey items were identified from the pellets at 3.02±1.77 per pellet. They were composed of seven taxa of mammals (Apodemus semotu, Eothenomys melanogaster, Niviventer culturatus, Crocidura horsfieldi, Sciuridae, Tamiops maritimus, Belomys pearsoni) and six taxa of birds (Paridae, Timaliidae, Sylviidae, Passeriformes, Strigiformes, Accipiter sp.). In terms of the number of the preys, Apodemus semotus was most abundant, composing 43.9% of the total, and then followed by Paridae (25.4%) and N. culturatus (10.8%). In terms of biomass, A. semotus contributed 35.1% and N. culturatus was 30.7%. These two species were the most important diet, contributing 60 to 74.2% of the total biomass of the preys in the pellets of the owl. The average number of prey items were 4.28±1.90 per pellet and 3.58±2.14 per pellet in spring and winter, significant higher than 2.48±1.41 and 2.40±1.38 in summer and fall (Tukey test, p＜0.05). The diet composition also differed among seasons; mammals were major food sources in summer and fall, while birds became more important in spring and winter.

關鍵字

灰林鴞 ； 食性 ； 食繭 ； 台灣

並列摘要

Pellets of tawny owls (Strix aluco) were collected on roadsides in the Central Mountain Range at elevations of 1,479m to 2,650m in the central Taiwan, 2000 and 2005. For 180 pellets collected, the sizes were 5.87±1.40 (mean±SE) cm in length, 3.42±0.72 cm in width, and 2.62±0.42 cm in depth. A total of 544 prey items were identified from the pellets at 3.02±1.77 per pellet. They were composed of seven taxa of mammals (Apodemus semotu, Eothenomys melanogaster, Niviventer culturatus, Crocidura horsfieldi, Sciuridae, Tamiops maritimus, Belomys pearsoni) and six taxa of birds (Paridae, Timaliidae, Sylviidae, Passeriformes, Strigiformes, Accipiter sp.). In terms of the number of the preys, Apodemus semotus was most abundant, composing 43.9% of the total, and then followed by Paridae (25.4%) and N. culturatus (10.8%). In terms of biomass, A. semotus contributed 35.1% and N. culturatus was 30.7%. These two species were the most important diet, contributing 60 to 74.2% of the total biomass of the preys in the pellets of the owl. The average number of prey items were 4.28±1.90 per pellet and 3.58±2.14 per pellet in spring and winter, significant higher than 2.48±1.41 and 2.40±1.38 in summer and fall (Tukey test, p＜0.05). The diet composition also differed among seasons; mammals were major food sources in summer and fall, while birds became more important in spring and winter.

並列關鍵字

Tawny owl ； Strix aluco ； diet ； pellets ； Taiwan