臺灣博碩士論文加值系統

為瞭解大冠鷲（Spilornis cheela hoya）的日活動模式，於2008年一月至八月使用無線電追蹤器監視墾丁社頂地區3隻未繁殖大冠鷲個體，包括1隻母鳥、1隻公鳥及1隻亞成鳥的日間行為。依據訊號將行為區分為停棲、移動、撲捉、進食和盤旋五項。結果顯示大冠鷲日間活動以停棲為主，比例高達98.5%。坐等型覓食策略應該是高比例停棲行為的主因。大冠鷲很少盤旋，移動、撲捉、進食行為則以上午較頻繁，顯示大冠鷲主要在上午覓食；但公鳥在下午進食頻繁，會移動至溪床捕食澤蟹。母鳥及亞成鳥日間行為活動模式沒有明顯季節變化；公鳥覓食時段則隨季節改變，春季主要在下午進食，但夏季進食時間以上午為主，食物分布變化可能是影響公鳥日行為模式季節變化的原因。

I radiotelemetry-tracked the diurnal activity pattern of 3 unbreeding Crested Serpent Eagles Spilornis cheela hoya, 1 adult male, 1 adult female, and 1 young, from January to August 2008 in Kenting, southern Taiwan. All 3 birds spent most of daylight hours for perching (98.6%), but a few time for inter-perch flight (0.2%), hunting (0.5%), and circling (0.9%). The extremely high proportion of perching behavior might caused by a sit-and-wait foraging strategy of the eagles. The eagles generally ate before noon, whereas the male frequently ate crabs at a valley in afternoon during spring 2008. The diurnal activity pattern of the female and young seldom change through the study period. In contrast, feeding on time of day of the male varied between the spring and summer, spatial and temporal distribution of its food might cause this change.

摘要 i
Abstract ii
致謝 iii
目錄 i
表目錄 ii
圖目錄 ii
前言 1
研究方法 3
一.研究區位 3
二.研究對象 3
三.資料收集 3
四.資料分析 4
結果 5
一.大冠鷲日活動行為 5
二.上午及下午活動頻度差異 6
三.不同季節間行為模式差異 7
討論 8
一、覓食策略影響日間行為 8
二、日活動模式 9
三、盤旋行為 10
三、不同季節間 活動模式差異 11
參考文獻 13

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