大规模的过程和亚洲偏差在温带植物的物种多样性
1Department of Forest Sciences, University of British Columbia, Vancouver, Canada.
Nature
|September 23, 2000
概括
在亚洲和北美温带地区的植物物种丰富程度显著不同. 亚洲更大的生理异质性可能导致了更高的植物多样化率,造成了显著的多样性异常.
科学领域:
- 生态生态学 生态生态学
- 进化生物学 进化生物学
- 生物地理学是生物地理学.
背景情况:
- 全球物种丰富的模式受到大规模过程和历史因素的影响.
- 生态相互作用可以限制当地物种的共存,但多样性异常表明其他因素也在发挥作用.
- 物种生产率可能会独立地影响区域多样性,导致异常.
研究的目的:
- 调查东亚和北美东部 (EAS-ENA) 之间的植物属脱节的多样性异常的原因.
- 确定净多样化率的差异是否解释了观察到的物种丰富差异.
- 提出生理异质性在驱动进化辐射中的作用.
主要方法:
- 在EAS-ENA中对具有分离分布的植物属进行比较分析.
- 检查姐妹对血统,以控制共享的进化历史.
- 评估生理异质性和环境变化作为多样化的驱动力.
主要成果:
- 温带EAS-ENA植物属在亚洲的物种数量大约是北美物种的两倍.
- 亚洲和北美的血统在很大程度上是姐妹对,表明共享的前离合历史.
- 多样性异常归因于大陆之间的净多样化 (物种化-灭绝) 的差异.
结论:
- 在EAS-ENA中观察到的植物多样性异常不是由于采样偏差,而是反映了差异化的多样化.
- 在温带东亚的极端生理异质性被认为是更高多样化的首要驱动力.
- 地形,气候和海平面变化的综合影响可能促进了亚洲的全方位物种化和进化辐射.
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