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。960Please respect copyright.PENANAvKpJtejGcX960Please respect copyright.PENANAKjLzufHHmA
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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。960Please respect copyright.PENANA6L0Nl3x6BD
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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。960Please respect copyright.PENANAEgXkLYaHlZ960Please respect copyright.PENANA2H91NMgmMv
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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)。960Please respect copyright.PENANAG6WBwIA59D960Please respect copyright.PENANAtwpYUuFwKi
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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。960Please respect copyright.PENANAA0H9j4UjOf
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為何日照時份的飛行高度要特別的提高呢?960Please respect copyright.PENANAf9bTSVXzuE
科學家暫時還沒能找出確實理由,只能作出假設。960Please respect copyright.PENANAnFpLD6yztc
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。960Please respect copyright.PENANAgC2HE5ptyZ
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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。960Please respect copyright.PENANAoBScwoxwpd960Please respect copyright.PENANATYNAaXYY4A
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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。960Please respect copyright.PENANAejuWiiT7ZV
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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/toc960Please respect copyright.PENANAac8pmMHa8p
960Please respect copyright.PENANAcCAQyYcPPz
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。960Please respect copyright.PENANAsqiOTwH8ZE
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Link:960Please respect copyright.PENANAK9UNSu7EK3
https://www.penana.com/user/27349/%E8%96%AF%E4%BB%94%E8%81%9E%E8%8C%B1%E8%8E%89/portfolio960Please respect copyright.PENANAJSPpYn8aVP
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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。960Please respect copyright.PENANApDan7SOaEF
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Ref1:https://science.sciencemag.org/content/372/6542/646960Please respect copyright.PENANAWiTqFZuB31
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科普專欄–薯不揀單
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薯仔聞茱莉

篇 #223
三十秒科學–雀鳥的飛行里數
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