移民历史控制了实验适应性辐射的多样化
Tadashi Fukami1, Hubertus J E Beaumont, Xue-Xian Zhang
1Department of Zoology, University of Hawaii at Manoa, Honolulu, Hawaii 96822, USA. tfukami@hawaii.edu
Nature
|March 23, 2007
概括
物种移民的时间对生物多样性产生了重大影响. 早期到来可以抑制多样化,改变进化轨迹和社区集会动态.
科学领域:
- 生态生态学 生态生态学
- 进化生物学 进化生物学
- 微生物学 微生物学
背景情况:
- 生物多样性源于移民,多样化和灭绝,但它们的相互作用仍然不清楚.
- 了解社区集会的历史背景对于预测生物多样性模式至关重要.
研究的目的:
- 研究移民的顺序和时间如何影响生物群体内的多样化.
- 阐明早期移民影响后来的进化多样化的机制.
主要方法:
- 利用带有细菌基因型的空间结构化息地模型.
- 操纵了祖先基因型和利基专家类型的引入时间.
- 在不同的移民情景下分析了多元化率和社区组成.
主要成果:
- 当一个祖先的基因型首次被引入时,多样化是快速的.
- 利基专家的早期引入抑制了祖先基因型的多样化.
- 晚期引入的利基专家对多元化影响最小.
- 移民历史通过竞争和促进改变了适应性辐射动态.
结论:
- 移民事件的顺序和时间是进化多样化的关键决定因素.
- 社区集会是一个历史上偶然的过程,移民历史塑造了生物多样性.
- 生态相互作用,如竞争和促进,调解移民对多样化的影响.
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