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。937Please respect copyright.ＰＥＮＡＮＡOBaMmFDq3f
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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。937Please respect copyright.ＰＥＮＡＮＡzA0c7BHjLO
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(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。937Please respect copyright.ＰＥＮＡＮＡCdARWb7bYV
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(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)。937Please respect copyright.ＰＥＮＡＮＡX4DyE3ezlZ
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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。937Please respect copyright.ＰＥＮＡＮＡi4Wk7uRXDr
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為何日照時份的飛行高度要特別的提高呢?937Please respect copyright.ＰＥＮＡＮＡe3iknNRSv9
科學家暫時還沒能找出確實理由，只能作出假設。937Please respect copyright.ＰＥＮＡＮＡ8ufyvPC5NU
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。937Please respect copyright.ＰＥＮＡＮＡRFd4GpZtfa
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(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。937Please respect copyright.ＰＥＮＡＮＡHYhPxuezRx
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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。937Please respect copyright.ＰＥＮＡＮＡ561dL28QKB
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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。937Please respect copyright.ＰＥＮＡＮＡKuSKXGntSq
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https://www.penana.com/user/27349/%E8%96%AF%E4%BB%94%E8%81%9E%E8%8C%B1%E8%8E%89/portfolio937Please respect copyright.ＰＥＮＡＮＡQcuLw4ou8P
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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。937Please respect copyright.ＰＥＮＡＮＡAZCSooqt7r
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Ref1:https://science.sciencemag.org/content/372/6542/646937Please respect copyright.ＰＥＮＡＮＡnCN1U5nibK
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