(前排生病,測試咗唔係武肺。現在正常更番。)294Please respect copyright.PENANAbegS54V8fx
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沙漠經常被描繪成為鳥不生蛋的地方。雖有不少動物均會採取夜行性方針躲避有機會超過50度高溫的日間環境。但現實上仍有選擇在日間行動的沙漠雀鳥。294Please respect copyright.PENANASjhevwHRKc
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(圖2)有資料顯示,居住在沙漠的雀鳥,每天有數小時可以維持自己體溫低於外間溫度10-20度左右。294Please respect copyright.PENANATBzWxHM3DJ
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而斑胸草雀是其中一種能適應沙漠氣溫的雀鳥,有研究發現,牠們在高溫下會發出獨特快速節奏的高音叫聲,下稱「熱叫」。294Please respect copyright.PENANAMfSFDH2wGO
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研究人員找來44隻斑胸草雀,其中有32隻(73%)會遇熱時會發出熱叫。294Please respect copyright.PENANAw8bYniqV3p
如圖中所示,隨著溫度逐漸提升,喘氣所佔用的時間開始增加。294Please respect copyright.PENANAxpbFFzDkXR
而當溫度達40度的時候,雀鳥們會開始熱叫。294Please respect copyright.PENANAIn0egeIJoV
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(圖3)不懂熱叫的雀仔,在42度的時候開始出現失去平衝等不適狀態,實驗立即停止。294Please respect copyright.PENANA0eE4YX0LUb
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而會熱叫的雀仔,有部份能44度支撐20分鐘有多。294Please respect copyright.PENANA2ecoAa2Pi9
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有部分雀鳥會透過gular flutter來抵禦高溫,如下面影片一樣,雀鳥會透過振盪來讓熱空氣與內裡濕潤的內壁環境接觸,熱空氣會蒸發內壁環境的水滴(水滴的能量會轉移到空氣中,因此水滴的溫度會降低),因而盡量減低身體溫度。294Please respect copyright.PENANALXkytXscIZ
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https://www.youtube.com/watch?v=NggVoJ7mOos294Please respect copyright.PENANAUlZhbtXNjb
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但並不是所有雀鳥也能這樣做,至少班胸雀鳥沒有這功能。294Please respect copyright.PENANAkMvJgZRKY0
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或計熱叫就是牠們發展出的一種散熱方式,可能原理非常接近,但還需進一步的確認。294Please respect copyright.PENANAIskpXU8sW5
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至少,懂得熱叫的雀鳥也較抵禦高溫。294Please respect copyright.PENANAfhD4iufpBY
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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。294Please respect copyright.PENANACq6NCP97zB
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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/toc294Please respect copyright.PENANA74LuM4yJkF
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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。294Please respect copyright.PENANA27BlUmdPHf
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Link:294Please respect copyright.PENANAo70eUSA7zB
https://www.penana.com/user/27349/%E8%96%AF%E4%BB%94%E8%81%9E%E8%8C%B1%E8%8E%89/portfolio294Please respect copyright.PENANA5GO3rrf3oY
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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。294Please respect copyright.PENANACXcL0f0yfI
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Ref1:https://www.nature.com/articles/s41598-020-75909-6294Please respect copyright.PENANAMOkAG7v2iY