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。)477Please respect copyright.ＰＥＮＡＮＡpcye4tuhzr
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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。477Please respect copyright.ＰＥＮＡＮＡ9sIJTd2W6c
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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。477Please respect copyright.ＰＥＮＡＮＡKmk9NFN8Kd
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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」。477Please respect copyright.ＰＥＮＡＮＡ0N3MQJyV6l
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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。477Please respect copyright.ＰＥＮＡＮＡQv4H6n8SZv
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。477Please respect copyright.ＰＥＮＡＮＡEGvwAr2daR
而當溫度達40度的時候，雀鳥們會開始熱叫。477Please respect copyright.ＰＥＮＡＮＡkBc2uC4Z6p
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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。477Please respect copyright.ＰＥＮＡＮＡIyoI1rkamJ
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而會熱叫的雀仔，有部份能44度支撐20分鐘有多。477Please respect copyright.ＰＥＮＡＮＡW6lBnwywc5
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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。477Please respect copyright.ＰＥＮＡＮＡNLNCP89bfq
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https://www.youtube.com/watch?v=NggVoJ7mOos477Please respect copyright.ＰＥＮＡＮＡj9OiDXzKM7
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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。477Please respect copyright.ＰＥＮＡＮＡU10hN93hj2
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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。477Please respect copyright.ＰＥＮＡＮＡW0ZcHLoDBu
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至少，懂得熱叫的雀鳥也較抵禦高溫。477Please respect copyright.ＰＥＮＡＮＡyV9CxFPvku
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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。477Please respect copyright.ＰＥＮＡＮＡnvFEyMUwCD
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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/toc477Please respect copyright.ＰＥＮＡＮＡOryfyOV8nQ
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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。477Please respect copyright.ＰＥＮＡＮＡILKTaffFaD
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Link:477Please respect copyright.ＰＥＮＡＮＡWNW68KN73I
https://www.penana.com/user/27349/%E8%96%AF%E4%BB%94%E8%81%9E%E8%8C%B1%E8%8E%89/portfolio477Please respect copyright.ＰＥＮＡＮＡXNuBb9lk6N
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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。477Please respect copyright.ＰＥＮＡＮＡ25E37bPb28
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Ref1:https://www.nature.com/articles/s41598-020-75909-6477Please respect copyright.ＰＥＮＡＮＡTkd2QOjQwH

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