甲虫の包括的な系統遺伝は,超放射線の進化的起源を明らかにする
Toby Hunt1, Johannes Bergsten, Zuzana Levkanicova
1Department of Entomology, Natural History Museum, Cromwell Road, London SW7 5BD, UK.
Science (New York, N.Y.)
|December 22, 2007
まとめ
甲虫の進化は,高種の豊かさが古代の起源と,多様なニッチでの持続的な生存によるものであり,急速な多様化や草食によるものではないことを明らかにします. この研究では,甲虫 (Coleoptera) の系統を分析して,その進化の成功を理解しました.
科学分野:
- 進化生物学の進化生物学について
- 生物多様性 科学 科学 生物多様性
- エントモロジー エントモロジー学
背景:
- 甲虫 (Coleoptera) は,世界の生物多様性の重要な部分を占め,その進化の歴史は生命の多様性を理解するために重要である.
- 甲虫の進化的関係と多様化パターンに関する既存の知識は,特に初期の系統とその成功の要因に関する知識は不完全である.
研究 の 目的:
- 甲虫 (Coleoptera) の進化史と多様化を明らかにするために,甲虫 (Coleoptera) の包括的な系統遺伝分析を実施する.
- ポリファガ・スーパーグループ内の最古の分岐系統を特定し,甲虫の例外的な種多様性に寄与する要因を決定する.
主な方法:
- ほぼ1900種の3つの遺伝子を用いた系統遺伝分析で,認識されている甲虫ファミリーの80%以上を占める.
- フィロゲーニーの年代付けは,分岐の出来事と多様化率のタイミングを推論する.
- 多様化,起源時間,生態学的役割 (例えば,草食動物),および主要な地質的出来事 (例えば,白期の血管精子放射) の間の相関を検証する.
主要な成果:
- ポリファガの超群の中で基礎的関係を確立し,最も初期の系統として5つの家族を特定しました.
- 甲虫の成功は,例外的に高い純多様化率や,血管精子放射線に関連した草食性の主要な役割によって説明されないことがわかった.
- 現在の100以上の系統が白亜紀より以前に発生したことを示した.
結論:
- 甲虫の種の豊かさは,古代の系統の長期的な生存と,幅広い生態学的ニッチで持続的な多様化に起因する.
- 甲虫の進化的成功は,白亜期の急速な増殖や特定の生態学的な関連ではなく,系統の長寿とニッチの幅の結果である.
- この研究は,甲虫の生物多様性を理解するための堅固な進化的枠組みを提供し,甲虫の多様化におけるクレタセウス以前の起源の重要性を強調しています.
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