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。826Please respect copyright.ＰＥＮＡＮＡuBClHtJEGu
826Please respect copyright.ＰＥＮＡＮＡEInGl4mVbh
826Please respect copyright.ＰＥＮＡＮＡewmOp0xmUC
（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)。826Please respect copyright.ＰＥＮＡＮＡWUNoQWTDk7
826Please respect copyright.ＰＥＮＡＮＡJm8uqJqpXC
826Please respect copyright.ＰＥＮＡＮＡ9MCqtU76JQ
（圖3）冬天期間，小臭鼩(Etruscan shrew)的大腦皮層厚度會相應減少。826Please respect copyright.ＰＥＮＡＮＡbHnVoUPIAf
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。826Please respect copyright.ＰＥＮＡＮＡXqeCc20eH7
826Please respect copyright.ＰＥＮＡＮＡV9hoHG54S8
826Please respect copyright.ＰＥＮＡＮＡ1q5w4tlS1I
（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。826Please respect copyright.ＰＥＮＡＮＡ62OOVyqF8e
但若果食物供應足夠的話，則不會出現「腦細」的情況。826Please respect copyright.ＰＥＮＡＮＡor5sLV9Prx
826Please respect copyright.ＰＥＮＡＮＡIsFJh8kQd7
826Please respect copyright.ＰＥＮＡＮＡ5h9dR2rcnG
（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。826Please respect copyright.ＰＥＮＡＮＡCnBIfagAIZ
對比其他區域，L4區域含有最高濃度的Cytochrome oxidase(CO)蛋白酶，826Please respect copyright.ＰＥＮＡＮＡi8mnP8HwTO
而CO蛋白酶的功用則為製造能源。826Please respect copyright.ＰＥＮＡＮＡ63KTuGV81Z
826Please respect copyright.ＰＥＮＡＮＡfeklCoyY74
826Please respect copyright.ＰＥＮＡＮＡa0ai64api0
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。826Please respect copyright.ＰＥＮＡＮＡ4Gkv8R6ndE
826Please respect copyright.ＰＥＮＡＮＡo64N8H9EhY
當然，亦不排除有其他的可能性。826Please respect copyright.ＰＥＮＡＮＡXc1nmyJVLL
826Please respect copyright.ＰＥＮＡＮＡwhdcmHj9cD
（圖6）圖中為大腦皮層磁力共振得出的影像。826Please respect copyright.ＰＥＮＡＮＡ24BS0Q83Zj
藍綠色為冬天的時候，而橙黃色則為夏天時候。826Please respect copyright.ＰＥＮＡＮＡlvFkaRV1E9
826Please respect copyright.ＰＥＮＡＮＡQAUhccMSQ8
826Please respect copyright.ＰＥＮＡＮＡuS8hZANoU2
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。826Please respect copyright.ＰＥＮＡＮＡjPbXX5rmq3
826Please respect copyright.ＰＥＮＡＮＡcoRaBpu1q6
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。826Please respect copyright.ＰＥＮＡＮＡqqSdDbVNJF
826Please respect copyright.ＰＥＮＡＮＡjPTFN0kgbE
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。826Please respect copyright.ＰＥＮＡＮＡacrPdtv4K9
826Please respect copyright.ＰＥＮＡＮＡ92dRlhXhK8
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/toc826Please respect copyright.ＰＥＮＡＮＡMPnhsolaRF
826Please respect copyright.ＰＥＮＡＮＡXUWEGx0Dvc
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。826Please respect copyright.ＰＥＮＡＮＡYIIuaY3Fjl
826Please respect copyright.ＰＥＮＡＮＡmtTc7Wbkb6
Link:826Please respect copyright.ＰＥＮＡＮＡK7Idb046BX
https://www.penana.com/user/27349/%E8%96%AF%E4%BB%94%E8%81%9E%E8%8C%B1%E8%8E%89/portfolio826Please respect copyright.ＰＥＮＡＮＡUiEf6pQBld
826Please respect copyright.ＰＥＮＡＮＡqonCpc4P1G
有興趣接收科學資訊的話，歡迎follow IG: potatopigtongue。826Please respect copyright.ＰＥＮＡＮＡ0tbEMUWKD7
826Please respect copyright.ＰＥＮＡＮＡBrfDhRFpxs
https://www.instagram.com/potatopigtongue/826Please respect copyright.ＰＥＮＡＮＡvr85VjzCqg
826Please respect copyright.ＰＥＮＡＮＡYHr83PYqHU
Ref1:https://www.pnas.org/content/early/2020/11/24/1922888117826Please respect copyright.ＰＥＮＡＮＡ4XrYWD11r4