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。)442Please respect copyright.ＰＥＮＡＮＡhTeijMWyLj
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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。442Please respect copyright.ＰＥＮＡＮＡrJDdGxYWH4
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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。442Please respect copyright.ＰＥＮＡＮＡ3i7LCkbYEG
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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」。442Please respect copyright.ＰＥＮＡＮＡYMcU4mC9re
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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。442Please respect copyright.ＰＥＮＡＮＡGa8AZjsw1Y
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。442Please respect copyright.ＰＥＮＡＮＡpLJPjRS9T4
而當溫度達40度的時候，雀鳥們會開始熱叫。442Please respect copyright.ＰＥＮＡＮＡAtZsyHT2a6
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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。442Please respect copyright.ＰＥＮＡＮＡY515C1ZlTy
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而會熱叫的雀仔，有部份能44度支撐20分鐘有多。442Please respect copyright.ＰＥＮＡＮＡUJ8iJ1G62m
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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。442Please respect copyright.ＰＥＮＡＮＡLUJLq01b8e
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https://www.youtube.com/watch?v=NggVoJ7mOos442Please respect copyright.ＰＥＮＡＮＡayYkfJSORM
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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。442Please respect copyright.ＰＥＮＡＮＡTqBO6g7a5z
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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。442Please respect copyright.ＰＥＮＡＮＡ8RGYEfHgBQ
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至少，懂得熱叫的雀鳥也較抵禦高溫。442Please respect copyright.ＰＥＮＡＮＡkBQ0Yuh7ji
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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。442Please respect copyright.ＰＥＮＡＮＡx5dXO9nfPs
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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/toc442Please respect copyright.ＰＥＮＡＮＡ5dmXQz8t4I
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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。442Please respect copyright.ＰＥＮＡＮＡYOYzoxEchh
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Link:442Please respect copyright.ＰＥＮＡＮＡeJiVcUXhMF
https://www.penana.com/user/27349/%E8%96%AF%E4%BB%94%E8%81%9E%E8%8C%B1%E8%8E%89/portfolio442Please respect copyright.ＰＥＮＡＮＡV4B90Uu5uE
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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。442Please respect copyright.ＰＥＮＡＮＡsjcCKWqVte
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Ref1:https://www.nature.com/articles/s41598-020-75909-6442Please respect copyright.ＰＥＮＡＮＡkMOTmo4EPC

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