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。982Please respect copyright.PENANAglrUIMAN9B982Please respect copyright.PENANAzYR61ygGYz
982Please respect copyright.PENANAqEUAXpxI78
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。982Please respect copyright.PENANASfeqeg0GyO
982Please respect copyright.PENANAySyssOKavb
982Please respect copyright.PENANA9Ui0nqnoqd
(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。982Please respect copyright.PENANAiaoiVGdAQk982Please respect copyright.PENANAElbF8bXjwH
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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)。982Please respect copyright.PENANAMnbt8a1MrZ982Please respect copyright.PENANAsEoMhwh79m
982Please respect copyright.PENANAalCKp0jvrn
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。982Please respect copyright.PENANA05JPbVDLIR
982Please respect copyright.PENANA7isuI8zhdH
為何日照時份的飛行高度要特別的提高呢?982Please respect copyright.PENANAuDloRs8vi4
科學家暫時還沒能找出確實理由,只能作出假設。982Please respect copyright.PENANAyYqaJ1cbCH
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。982Please respect copyright.PENANA4M9ZZyQgGJ
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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。982Please respect copyright.PENANASd9BdnrxoH982Please respect copyright.PENANATpIeN6DWt4
982Please respect copyright.PENANATWLmpBdhec
982Please respect copyright.PENANAgUs8s958Fg
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。982Please respect copyright.PENANActvS3QkNrY
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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/toc982Please respect copyright.PENANAPlShy2j5nL
982Please respect copyright.PENANAm1n2dovtmS
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。982Please respect copyright.PENANADznHLPqBva
982Please respect copyright.PENANAvQpjb0o2Lh
Link:982Please respect copyright.PENANAxunolLIgPB
https://www.penana.com/user/27349/%E8%96%AF%E4%BB%94%E8%81%9E%E8%8C%B1%E8%8E%89/portfolio982Please respect copyright.PENANAlVfooFDXGK
982Please respect copyright.PENANA1Qp87i4jzF
982Please respect copyright.PENANABJYL2E3avG
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。982Please respect copyright.PENANArtZLT3aUYr
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Ref1:https://science.sciencemag.org/content/372/6542/646982Please respect copyright.PENANAIIYll0tBBz
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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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