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。769Please respect copyright.PENANAWU3VWjy3rb
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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。769Please respect copyright.PENANAOTLEKPjHyO
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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。769Please respect copyright.PENANAXc2Mv7yhsQ
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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)。769Please respect copyright.PENANAT9UTbtcFQq
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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。769Please respect copyright.PENANA6H9FtYRYJM
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為何日照時份的飛行高度要特別的提高呢?769Please respect copyright.PENANAtUDkGXgDRL
科學家暫時還沒能找出確實理由,只能作出假設。769Please respect copyright.PENANA4oamSfWBFU
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。769Please respect copyright.PENANADmQAo3UJfk
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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。769Please respect copyright.PENANAZnGd80RkS9
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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。769Please respect copyright.PENANAgPqwQsOZd9
769Please respect copyright.PENANA7QqMC8WVwV
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/toc769Please respect copyright.PENANAokf8wFBuqD
769Please respect copyright.PENANALR6DfXi9dz
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。769Please respect copyright.PENANA6fYgT7Us1B
769Please respect copyright.PENANASSE307bLoT
Link:769Please respect copyright.PENANAZxySlXASML
https://www.penana.com/user/27349/%E8%96%AF%E4%BB%94%E8%81%9E%E8%8C%B1%E8%8E%89/portfolio769Please respect copyright.PENANAgJlkAdsaHz
769Please respect copyright.PENANAuUU7cAEtCr
769Please respect copyright.PENANAU6pWrEHBFz
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。769Please respect copyright.PENANAAd3ODalB1A
769Please respect copyright.PENANA2ubUAb9ToK
Ref1:https://science.sciencemag.org/content/372/6542/646769Please respect copyright.PENANAq3OjlZ1Td5
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科普專欄–薯不揀單
Author:
薯仔聞茱莉
ISSUE #223
三十秒科學–雀鳥的飛行里數
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