科普專欄–薯不揀單 - 深入淺出–非洲大象每日流幾多汗水？

體型龐大的野外非洲大象(Loxodonta africana) ，每日步行接近8-12公里。545Please respect copyright.ＰＥＮＡＮＡHawpPalH5S
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在非洲的和暖氣候下，行走無可避免會出汗，那麼牠們每日大概會流失多少水份呢？545Please respect copyright.ＰＥＮＡＮＡItXCErYYE9
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（圖2）有科學家利用動物園的非洲大象作研究(Ref1)，將D2O注入在麵包裡，讓大象吃下肚裡；545Please respect copyright.ＰＥＮＡＮＡ0dqoMnd8oX
可以把D2O理解成為被標記的水份，從而可以區分本身沒有被標記的H2O水份。545Please respect copyright.ＰＥＮＡＮＡjtTLZZapLW
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讓D2O透過食物進入大象血液循環系統後，每隔24小時便會進行抽血動作，為期10日，透過量度D2O的流失量計算出水份流失率。545Please respect copyright.ＰＥＮＡＮＡgGzx2ArsSB
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（圖3）最後計算得出，在攝氏25度中，大象每日水份的流失量約為身體重量的12%左右。545Please respect copyright.ＰＥＮＡＮＡxZvXSg5dlR
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基於是次研究對象為2000-5000kg的6隻大象，每日水份流失量的平均數為325升，最高可達516升。545Please respect copyright.ＰＥＮＡＮＡf5tScqPRTn
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全球天氣逐漸極端化，野外大象將來能否從野外獲取足夠水份彌補所失水份，將成一大疑問。545Please respect copyright.ＰＥＮＡＮＡOSYaVElp5Q
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有興趣接收科學資訊的話，歡迎follow IG: potatopigtongue。545Please respect copyright.ＰＥＮＡＮＡ3GNltu5wfu
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Ref1:https://royalsocietypublishing.org/doi/pdf/10.1098/rsos.201155

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