科普專欄–薯不揀單 - 三十秒科學–在沙漠生活的雀鳥

（前排生病，測試咗唔係武肺。現在正常更番。)519Please respect copyright.ＰＥＮＡＮＡVdqyIRoXBX
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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。519Please respect copyright.ＰＥＮＡＮＡxJBvjCk5WR
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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。519Please respect copyright.ＰＥＮＡＮＡIj7FgBbsr2
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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」。519Please respect copyright.ＰＥＮＡＮＡmfsphkIa7j
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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。519Please respect copyright.ＰＥＮＡＮＡP3sVR7T1L0
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。519Please respect copyright.ＰＥＮＡＮＡNOS6ShC7CN
而當溫度達40度的時候，雀鳥們會開始熱叫。519Please respect copyright.ＰＥＮＡＮＡFA520rrpa1
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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。519Please respect copyright.ＰＥＮＡＮＡTqHoCLDciZ
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而會熱叫的雀仔，有部份能44度支撐20分鐘有多。519Please respect copyright.ＰＥＮＡＮＡBY1eZ5ycG2
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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。519Please respect copyright.ＰＥＮＡＮＡIUERkHsg82
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https://www.youtube.com/watch?v=NggVoJ7mOos519Please respect copyright.ＰＥＮＡＮＡLn8nutVGT9
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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。519Please respect copyright.ＰＥＮＡＮＡjqaNUydZRJ
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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。519Please respect copyright.ＰＥＮＡＮＡdL26DG02Tm
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至少，懂得熱叫的雀鳥也較抵禦高溫。519Please respect copyright.ＰＥＮＡＮＡrRR8Imerwq
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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。519Please respect copyright.ＰＥＮＡＮＡ6V5zax0OyJ
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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/toc519Please respect copyright.ＰＥＮＡＮＡpLoaOmhJr7
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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。519Please respect copyright.ＰＥＮＡＮＡllVMqTsZzz
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https://www.penana.com/user/27349/%E8%96%AF%E4%BB%94%E8%81%9E%E8%8C%B1%E8%8E%89/portfolio519Please respect copyright.ＰＥＮＡＮＡMkXUX5nAOE
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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。519Please respect copyright.ＰＥＮＡＮＡ1a04FOTyiS
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Ref1:https://www.nature.com/articles/s41598-020-75909-6519Please respect copyright.ＰＥＮＡＮＡMaZCaER0Mc

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