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修道士カニの祖先からキングカニの進化
C W Cunningham1, N W Blackstone, L W Buss
1Department of Biology, Yale University, New Haven, Connecticut 06511.
Nature
|February 6, 1992
まとめ
キング・クランバはエリミット・クランバから進化し,殻に棲む習慣を失い,わずか1千3~250万年でクランバのような形態 (がん化) を形成した. この急速な変容は,甲殻類の進化を理解するための重要な発見である.
科学分野:
- マリン・バイオロジー マリン・バイオロジー
- 進化生物学の進化生物学について
- 甲殻類の研究について
背景:
- キング・カニ (Lithodidae属) はカニのような形状と大きさを表しており,殻に依存するエリミット・カニとは対照的です.
- エリミット・カニの進化は,貝殻生活によって制約されており,特定の腹部形態とサイズを制限することが求められています.
- カーシニゼーションは,カクテル類の祖先からカクテルのような形態の進化であり,いくつかの系統で独立して発生しています.
研究 の 目的:
- キング・カニの癌化の進化速度を決定する.
- キング・カニとエリミット・カニの遺伝関係を調べるために.
- 貝殻棲息の喪失とキング・クランブにおけるクランブのような形態の発達の時間枠を推定する.
主な方法:
- 進化的関係を再構築するための分子系統遺伝分析.
- キング・キャブとエルミット・キャブの形態学的比較研究.
- 進化の出来事を推定する分子時計の推定値.
主要な成果:
- 分子学的証拠は,キング・クランブがエレミット・クランブ属パガルス (Pagurus) の内側に宿っていることを確認しています.
- 殻に棲むエリミット・カニから,完全に癌化したキング・カニへの移行は,急速に起こった.
- 完全な癌化までの推定時間枠は,1300万年から2500万年です.
結論:
- キング・クランブは,クランブのような形態を急速に進化させた,非常に派生した独身クランブです.
- キング・カニの進化は,加速された形態学的進化の驚くべき例を示しています.
- この移行を理解することで,甲殻類の進化的可塑性についての洞察が得られます.
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