2010及2011年秋季玉山國家公園塔塔加地區過境猛禽調查

2010及2011年秋季，我們選在赤腹鷹（Accipiter soloensis）及灰面鵟鷹（Butastur indicus）過境臺灣的高峰期各11天，在塔塔加地區進行過境猛禽定點調查（麟趾山及自忠）。兩地調查時間皆從6-7點到中午12點。兩年共記錄到過境猛禽8種69,980隻，其中灰面鵟鷹（35,118隻，50.18%）和赤腹鷹（34,755隻，49.66%）佔絕大多數。灰面鵟鷹與赤腹鷹在塔塔加的過境量相近，這與墾丁赤腹鷹遠多於灰面鵟鷹的情形不一致，此結果可能導因於取樣誤差或這兩種遷移性猛禽過境臺灣的路線不同。我們也發現2010年赤腹鷹及灰面鵟鷹在塔塔加的單日過境量與隔日墾丁的過境量皆呈顯著正相關，若將兩年資料或兩鷹種合併做迴歸分析，更達高度顯著正相關。顯示塔塔加應該位於這二種遷移性猛禽在臺灣的主要遷移路線上，特別是灰面鵟鷹，因此塔塔加的每日過境量有潛力用以預測隔天墾丁的過境量。這樣的預報模式若能建立，對臺灣賞鷹活動的推展將有莫大的助益。

關鍵字

灰面鵟鷹；赤腹鷹；遷移性猛禽；秋過境期；過境地

並列摘要

We conducted an 11-day raptor count during the main migration period of Chinese sparrowhawk (Accipiter soloensis) and grey-faced buzzard (Butastur indicus) in the Tataka area in the autumns of 2010-2011. Our fieldwork began at 6-7 a.m. and lasted until 12 a.m. at two sites. In total, 69,980 migratory raptors of eight species were recorded, and they were predominantly the grey-faced buzzard (35,118; 50.18%) and Chinese sparrowhawk (34,755; 49.66%). Passage numbers of these two migratory raptor species in Tataka showed different trends from those recorded in Kenting, where the Chinese sparrowhawk often outnumbered the grey-faced buzzard by three to five times. The discrepancy might have resulted from sampling error or because these two migratory raptor species took different routes when passing through Taiwan. In addition, the daily passage of both the Chinese sparrowhawk and grey-faced buzzard in Tataka were positively correlated with those counted in Kenting on the following day in 2010. Linear regression models incorporating data from both years or from both species showed a highly positive correlation. This implies that Tataka might be located on the main migration route of migratory raptors, especially for the grey-faced buzzard, and thus the daily count in Tataka provides a predictor of the passage number in Kenting the following day. Elaboration of forecast models would further promote hawk-watching activity and research in Taiwan.