克莱德密度和多样性依赖多样化的演变
Marcio R Pie1, Raquel Divieso2, Fernanda S Caron2
1Biology Department, Edge Hill University, Ormskirk, Lancashire, UK. piem@edgehill.ac.uk.
Nature communications
|July 29, 2023
概括
对物种多样性的生态限制经常被假定,但缺乏证据. 这项研究发现,密切相关的物种 (分类密度) 与陆地脊椎动物的物种化率之间没有联系,这质疑了依赖多样性的多样化理论.
科学领域:
- 进化生物学 进化生物学
- 生态生态学 生态生态学
- 生物多样性科学 生物多样性科学
背景情况:
- 对物种丰富性的生态限制概念是进化研究中常见的假设.
- 支持这些取决于多样性的多样化限制的经验证据很少.
- 了解调节区域物种池的因素对于生态和进化理论至关重要.
研究的目的:
- 实证地测试这一假设,即生态界限,特别是与相关物种的共,限制了物种化速率.
- 研究一个地区相关物种密度与新物种形成率之间的关系.
- 评估多样性依赖多样化的机制基础.
主要方法:
- 将近6000种陆地脊椎动物物种的综合地理分布和遗传学数据.
- 引入并计算的"克莱德密度":与相关物种重叠的面积的总和,按家族遗传距离加权.
- 在统计学上分析了不同种类和家族遗传不确定性的类密度和物种化率之间的关系.
主要成果:
- 在陆地脊椎动物中,类密度和物种化率之间没有发现显著的关系.
- 这种缺乏相关性是真的,无论分析的分类群体或家族遗传重建中的不确定性如何.
- 这些结果挑战了普遍认为,相关物种的存在直接限制了多样化.
结论:
- 多样性依赖多样化的机制基础似乎很脆弱,需要重新评估.
- 该研究强调,需要对塑造区域物种多样性的实际机制进行新的研究.
- 目前关于物种数量的生态极限的假设可能无法普遍适用或经验支持.
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