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2005.06.08

プラナリアの寿命って?

♪プラナリア~
  プラナリア~
  どうしてあなたはプラナリアなの~

プラナリアは切っても切っても再生する生物です。
外見はナメクジの頭を三角形にしたような感じです。
たとえ真っ二つにしたとしても、2匹に分裂します。
273分の1の肉片から1匹が再生したという記録もあるそうです。


そこでふと疑問に思ったんですけど、プラナリアの寿命ってどうなんでしょう?
2つに切ったら、2つに分かれるわけですよね。
新しく生まれてきた個体は、オリジナルの寿命を加算して生まれてくるのでしょうか? それとも0才で生まれてくるのでしょうか?

ところで、クローン羊のドリーが通常の羊の寿命の半分ほどで死にました。
生まれてきてから老化の兆候があったそうです。
そこで言われているのが、ドリーはオリジナルの年を加算して生まれてきたのではないか、ということです。


この結果から単純に考えれば、プラナリアから分裂した個体は、元の寿命を受け継いでいで生まれてくるという結論に至ります。

これとは逆に、元の寿命がクリアされていたら大変ですね。山をプラナリアで埋め尽くすことも……なんてことになり兼ねませんから。それ以前に生殖器が不要になりますね。

ただ、プラナリアはとても環境に対して敏感なので、すぐに死んでしまうそうです。
だから寿命を調べようとネットで検索しても見つかりませんでした。

それとも、こんなことを気にする人は誰もいないのでしょうか……。
気になって不眠になりそうだ。

プラナリアを知らないという人は、イメージでググればプラナリアを愛しちゃってるサイトがたくさんあります。

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