古代植被. 古代植被. 在东亚温带植物的多样性
S P Harrison1, G Yu, H Takahara
1Max Planck Institute for Biogeochemistry, PO Box 100164, 07701 Jena, Germany. sharris@bgc-jena.mpg.de
Nature
|September 15, 2001
概括
由于气候和冰河周期,东亚森林表现出高度的植物多样性. 然而,有证据表明,在冰川时期,温带森林的面积较小,这挑战了以前的物种化理论.
科学领域:
- 生态生态学 生态生态学
- 古植物学是古植物学.
- 进化生物学 进化生物学
背景情况:
- 与北美姐妹种群相比,东亚温带森林表现出异常的血管植物物种多样性.
- 这种多样性被归因于更大的气候多样性和在晚代热带冰河周期期间的全方位物种化机会.
- 以前的假设表明,在冰川时期,大陆架上的人口凝聚促进了物种化.
研究的目的:
- 调查晚代代代的气候波动和古植被在塑造东亚温带森林生物多样性的作用.
- 批判性地评估和里克利夫斯关于人口凝聚和全方位物种化的假设.
主要方法:
- 对东亚古植被数据的分析.
- 东亚和北美温带森林中的物种多样性的比较.
- 考察了古老时代晚期的地质和气候数据.
主要成果:
- 考古植被数据表明,东亚温带森林在最后一个冰川最大时期的面积明显低于以前的假设.
- 这种减少的森林面积挑战了在冰川时期在中国,韩国和日本等地区树木种群的合并.
- 这些发现质疑安和里克莱夫斯假设在当前形式的适用性.
结论:
- 在东亚的冰川时期,温带森林的范围可能没有支持拟议的物种化机制所需的种群连接.
- 需要替代或修改的假设来解释东亚温带森林中高血管植物物种的多样性.
- 结合古气候学,古植物学和人口遗传学的进一步研究至关重要.
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