季候鳥每年均會因天氣轉變而遷居,部份雀鳥更因此需要跨過地中海及撒哈拉沙漠。784Please respect copyright.PENANAcTjYcIrafU
784Please respect copyright.PENANAPzxZirxk3V
784Please respect copyright.PENANAxRKujtIR3K
有科學家為了探討那些雀鳥的飛行環境,特意為每年均需跨過地中海及撒哈拉沙漠的大葦鶯安裝紀錄儀器,藉此了解牠們的飛行時數、高度及溫度等。784Please respect copyright.PENANAvCEepJa6dR
784Please respect copyright.PENANATmna61nIzJ
784Please respect copyright.PENANAvUm1qNPbgV
(圖2)科學家們獲得了14隻雀鳥的23次長途飛行的記錄(9次為秋天、14次為春天時份),圖中藍色線為春天旅途、啡色為秋天旅途,其連續飛行時段為12.1-34.2小時不等。784Please respect copyright.PENANA8XlD375Sra
784Please respect copyright.PENANAs9n5k4U5VY
784Please respect copyright.PENANAFsA1JqfRNM
784Please respect copyright.PENANAZH2NstppsR
784Please respect copyright.PENANAA1AKuqDdan
(圖3)有趣的是,雀鳥在日照時候的飛行高度對比晚上時份會特別的高,早上(5367 ± 589 米 海拔)、晚上(2394 ± 1270 米 海拔)。784Please respect copyright.PENANAOihY378SCv
784Please respect copyright.PENANAZYg1TBoCaO
784Please respect copyright.PENANAMLKFYVwqOB
而飛行時的周遭溫度,晚上為13.8 ± 9.0°C,而日照時則為–9.3 ± 3.9°C。784Please respect copyright.PENANATYQMtne4NS
784Please respect copyright.PENANAQvReSe6MbT
為何日照時份的飛行高度要特別的提高呢?784Please respect copyright.PENANAXOgbV2uB3A
科學家暫時還沒能找出確實理由,只能作出假設。784Please respect copyright.PENANAZVJyErCnvP
其中一假設是,日照時份陽光照射的溫度會使牠們身體過熱,所以牠們特意飛高到溫度較低的高度從而降溫。784Please respect copyright.PENANAaX3N6AHELs
784Please respect copyright.PENANAgqG3xHhXjT
784Please respect copyright.PENANArDzGZ6ynVF
(圖4)另一假設是,有記錄記載捕食季候鳥的老鷹約在3500米海拔飛行,季候鳥在日照時份特意攀升,有可能是為了飛得比老鷹更高,逃避其追捕。784Please respect copyright.PENANAVsbOh5rij5
784Please respect copyright.PENANAwxiAbayoAK
784Please respect copyright.PENANA6R7hWkjawz
784Please respect copyright.PENANAsizfNPsTQu
如果想我快啲出文的話,請入去Penana網站科普專欄–薯不揀單俾一個like以及Bookmark,這對我非常之重要。784Please respect copyright.PENANA3nYFL5N9lW
784Please respect copyright.PENANAjNuQ2CTsv7
Link: https://www.penana.com/story/66244/%E7%A7%91%E6%99%AE%E5%B0%88%E6%AC%84-%E8%96%AF%E4%B8%8D%E6%8F%80%E5%96%AE/toc784Please respect copyright.PENANAeF2V0ovFCj
784Please respect copyright.PENANADApoKZYJxV
同時亦可以在Penana網站裡按「買一嚿/半嚿薯仔」,以課金的方式推動我繼續搜羅資料寫文,多謝。784Please respect copyright.PENANA8eHAm6IdJo
784Please respect copyright.PENANAFRmadLFN4f
Link:784Please respect copyright.PENANA2gcshm44QS
https://www.penana.com/user/27349/%E8%96%AF%E4%BB%94%E8%81%9E%E8%8C%B1%E8%8E%89/portfolio784Please respect copyright.PENANARxP2uKQqLp
784Please respect copyright.PENANAQKJDbLgVg2
784Please respect copyright.PENANAYlHcvdIFZy
除非Facebook及IG重開侵侵的account,否則我的IG將不會再作更新,只會寄居本土LIHKG及Penana。784Please respect copyright.PENANAOk4bDFc5f3
784Please respect copyright.PENANApIYI4KMOev
Ref1:https://science.sciencemag.org/content/372/6542/646784Please respect copyright.PENANA96TkHDJvm9