科普專欄–薯不揀單 - 深入淺出–動物過冬的一道奇謀

冬天到來，各動物均出盡渾身解數迎接大自然給予的挑戰，譬如老生常談的燕子南遷及松鼠冬眠等等。802Please respect copyright.ＰＥＮＡＮＡxx40xgZwcB
802Please respect copyright.ＰＥＮＡＮＡit5k6xWzUJ
802Please respect copyright.ＰＥＮＡＮＡJUYK0gNtOB
（圖2）而今次將要介紹的主角，就是體積非常細小的小臭鼩(Etruscan shrew)。802Please respect copyright.ＰＥＮＡＮＡ59kn6eho98
802Please respect copyright.ＰＥＮＡＮＡuoO8mND2jb
802Please respect copyright.ＰＥＮＡＮＡvEICNONTLK
（圖3）冬天期間，小臭鼩(Etruscan shrew)的大腦皮層厚度會相應減少。802Please respect copyright.ＰＥＮＡＮＡXpOwpTPfWZ
從圖中可見，唯獨是L4區域有所縮細，其他區域並無顯著改變。802Please respect copyright.ＰＥＮＡＮＡTyEunVa3kZ
802Please respect copyright.ＰＥＮＡＮＡ0Ak6QeSNpp
802Please respect copyright.ＰＥＮＡＮＡGs3csDGv5E
（圖4）有趣的是，在夏天期間，若果食物供應不足夠的話，小臭鼩(Etruscan shrew)的大腦皮層厚度亦會相應減少。802Please respect copyright.ＰＥＮＡＮＡ4JFdXEVmDb
但若果食物供應足夠的話，則不會出現「腦細」的情況。802Please respect copyright.ＰＥＮＡＮＡYZ5CQbGlTa
802Please respect copyright.ＰＥＮＡＮＡSCqaahpLy5
802Please respect copyright.ＰＥＮＡＮＡA2mJFWYZfm
（圖5）之所出現「腦細」的其中一個原因，相信是與新陳代謝有關。802Please respect copyright.ＰＥＮＡＮＡ9vp7g8P2gY
對比其他區域，L4區域含有最高濃度的Cytochrome oxidase(CO)蛋白酶，802Please respect copyright.ＰＥＮＡＮＡyb3sfwrCq1
而CO蛋白酶的功用則為製造能源。802Please respect copyright.ＰＥＮＡＮＡlsTOBmY1sB
802Please respect copyright.ＰＥＮＡＮＡ8KiHtRJOYk
802Please respect copyright.ＰＥＮＡＮＡJPR1oR6sv9
這暗示出可能小臭鼩為了應對冬天食物短缺問題，所以索性盡量棄用與新陳代謝有關的部份，以作節省資源。802Please respect copyright.ＰＥＮＡＮＡyo8mtiyCW0
802Please respect copyright.ＰＥＮＡＮＡZjVDIsXX0k
當然，亦不排除有其他的可能性。802Please respect copyright.ＰＥＮＡＮＡGHbOvxAJcd
802Please respect copyright.ＰＥＮＡＮＡHDO988xn8U
（圖6）圖中為大腦皮層磁力共振得出的影像。802Please respect copyright.ＰＥＮＡＮＡO7B3ATLp75
藍綠色為冬天的時候，而橙黃色則為夏天時候。802Please respect copyright.ＰＥＮＡＮＡ7MkczrSaaO
802Please respect copyright.ＰＥＮＡＮＡ5MTeBdsY9s
802Please respect copyright.ＰＥＮＡＮＡ1iYcfeV1Tq
冬天和夏天的影像互相重疊後，橙黃色的區域較多，顯示夏天的腦部體積較冬天的為大。802Please respect copyright.ＰＥＮＡＮＡXHaUThbXk9
802Please respect copyright.ＰＥＮＡＮＡVPLITlLRbA
平均來說，小臭鼩在冬天時候的大腦皮層厚度會縮減28%左右，但在下一年夏天的時候則會完全恢復回原有的厚度。802Please respect copyright.ＰＥＮＡＮＡV6WJjPWJ3L
802Please respect copyright.ＰＥＮＡＮＡjV4dxpm7Db
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。802Please respect copyright.ＰＥＮＡＮＡQmLLRKHYg9
802Please respect copyright.ＰＥＮＡＮＡHt7gx32ogW
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/toc802Please respect copyright.ＰＥＮＡＮＡbFh8dDD10t
802Please respect copyright.ＰＥＮＡＮＡAFZXi4HjnA
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。802Please respect copyright.ＰＥＮＡＮＡgU3ApYB1YW
802Please respect copyright.ＰＥＮＡＮＡYXGsMb5Viy
Link:802Please respect copyright.ＰＥＮＡＮＡIv3O5bFudZ
https://www.penana.com/user/27349/%E8%96%AF%E4%BB%94%E8%81%9E%E8%8C%B1%E8%8E%89/portfolio802Please respect copyright.ＰＥＮＡＮＡUjp3I7lsuA
802Please respect copyright.ＰＥＮＡＮＡEKVYRzPW8u
有興趣接收科學資訊的話，歡迎follow IG: potatopigtongue。802Please respect copyright.ＰＥＮＡＮＡNXpUzySsrG
802Please respect copyright.ＰＥＮＡＮＡ9j99FG89qU
https://www.instagram.com/potatopigtongue/802Please respect copyright.ＰＥＮＡＮＡJXZ6px0vMN
802Please respect copyright.ＰＥＮＡＮＡc4BQYNDbGK
Ref1:https://www.pnas.org/content/early/2020/11/24/1922888117802Please respect copyright.ＰＥＮＡＮＡO7yt4F9SOz