(前排生病,測試咗唔係武肺。現在正常更番。)494Please respect copyright.PENANARlwxPNPGXq
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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。494Please respect copyright.PENANAmbaHoqKDlN
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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。494Please respect copyright.PENANA9P6HGNcn24494Please respect copyright.PENANABIEbMNAh4n
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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」。494Please respect copyright.PENANAwds0fWhlMs
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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。494Please respect copyright.PENANA4GXqsljS8j
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。494Please respect copyright.PENANAxwvwmsL8Mu
而當溫度達40度的時候,雀鳥們會開始熱叫。494Please respect copyright.PENANAJN4094IIAl
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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。494Please respect copyright.PENANAhJXH2lNFhe494Please respect copyright.PENANAqZbyiVbeDh
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而會熱叫的雀仔,有部份能44度支撐20分鐘有多。494Please respect copyright.PENANA5UE5gdN3E9
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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。494Please respect copyright.PENANAwrw5gqv3z8
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https://www.youtube.com/watch?v=NggVoJ7mOos494Please respect copyright.PENANAV7k1G8xe0O
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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。494Please respect copyright.PENANAkom8muXMzp
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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。494Please respect copyright.PENANAW8U92dg4ko
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至少,懂得熱叫的雀鳥也較抵禦高溫。494Please respect copyright.PENANANJEyLZyz8a
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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。494Please respect copyright.PENANAs4a1ll0Grc
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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/toc494Please respect copyright.PENANA7y2yEYckoO
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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。494Please respect copyright.PENANAfgyvMEIWwd
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Link:494Please respect copyright.PENANAfwBtZQArqr
https://www.penana.com/user/27349/%E8%96%AF%E4%BB%94%E8%81%9E%E8%8C%B1%E8%8E%89/portfolio494Please respect copyright.PENANAKSyfrZS87Q
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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。494Please respect copyright.PENANA9UDQ9V2kEc
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Ref1:https://www.nature.com/articles/s41598-020-75909-6494Please respect copyright.PENANAPzIHyWYQVX