科普專欄–薯不揀單 - 三十秒科學–自割

自割 (Autotomy)是一種動物求生的本能，其中的例子包括壁虎斷尾，螃蟹斷臂等等。491Please respect copyright.ＰＥＮＡＮＡT3d5U67ys3
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過一段時間後，器官便會再生回復至原來的樣貌，其體積有機會比原來的更為細少。491Please respect copyright.ＰＥＮＡＮＡjlUjin0VSs
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（圖2）有科學家嘗試用尼龍蠅綁住海蛞蝓(Sea Slug)的頸部，發現牠們有能力進行自割，頭身分離。491Please respect copyright.ＰＥＮＡＮＡHvjc0LkDJZ
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有情況甚至是頭部與心臟、大腸、性器官等分離。而其脫離的頭部則吃著海藻維生。491Please respect copyright.ＰＥＮＡＮＡxDYgFQ2s3Q
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7日後，頭部發展出心臟等器官。約20日後，所有器官亦能順利發展成為原狀，又一條好漢。491Please respect copyright.ＰＥＮＡＮＡOrmrxiLHOL
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至於被遺棄的身體，則隨著時間變得暗淡及萎縮，沒能長出頭部。491Please respect copyright.ＰＥＮＡＮＡwDe5rAHaI1
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（圖3）自然情況下，當海蛞蝓遭受到寄生蟲入侵時，進行自割並頭身分離的情況亦會發生。491Please respect copyright.ＰＥＮＡＮＡAeP4yLLeKT
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鑑於這情況的發生，有理由可相信海蛞蝓進行自割是天生用來對抗外敵入侵的手段。491Please respect copyright.ＰＥＮＡＮＡ5vCgNvlyIJ
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此地不宜久留之時，若有逃生門手段可走，自然界的生物自當會不惜一切進行逃離。491Please respect copyright.ＰＥＮＡＮＡdMCIK8qEHY
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Ref1:https://www.cell.com/current-biology/fulltext/S0960-9822(21)00047-6491Please respect copyright.ＰＥＮＡＮＡjeU3ScYphA

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