生物多样性 ›› 2023, Vol. 31 ›› Issue (7): 23100.  DOI: 10.17520/biods.2023100

• 研究报告: 植物多样性 • 上一篇    下一篇

小檗科鬼臼亚科多样性格局的演化历史和成因

陈馥艳1,2, 游旨价1,*(), 张秋月1, 黄健1, 星耀武1,*()   

  1. 1.中国科学院西双版纳热带植物园热带森林生态学重点实验室, 云南勐腊 666303
    2.中国科学院大学, 北京 100049
  • 收稿日期:2023-04-03 接受日期:2023-07-17 出版日期:2023-07-20 发布日期:2023-07-22
  • 通讯作者: * E-mail: youzhijia@xtbg.ac.cn;ywxing@xtbg.org.cn
  • 作者简介:ywxing@xtbg.org.cn
    * E-mail: youzhijia@xtbg.ac.cn;
  • 基金资助:
    国家自然科学基金(32225005)

The diversification history of Podophylloideae (Berberidaceae) and its underlying drivers

Fuyan Chen1,2, Chih-Chieh Yu1,*(), Qiuyue Zhang1, Jian Huang1, Yaowu Xing1,*()   

  1. 1. CAS Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Mengla, Yunnan 666303
    2. University of Chinese Academy of Sciences, Beijing 100049
  • Received:2023-04-03 Accepted:2023-07-17 Online:2023-07-20 Published:2023-07-22
  • Contact: * E-mail: youzhijia@xtbg.ac.cn;ywxing@xtbg.org.cn

摘要:

探究生物多样性在类群和空间不均一性的形成机制对于认识多样性的形成和演化规律具有重要意义, 也是生物学研究的热点之一。鬼臼亚科属于小檗科, 包含10属约89种, 属间物种数量差异巨大。本研究利用比较系统发育学的研究方法, 重建了鬼臼亚科的系统发育关系、分化时间和多样化历史, 并探讨了生物和非生物因素对净多样化速率的影响。研究结果表明鬼臼亚科起源于92.75 Myr, 净多样化速率在约23 Myr开始明显提升, 最显著的净多样化速率转变发生在21 Myr附近的淫羊藿属(Epimedium)分支上。基于性状的演化速率分析显示, 具有蜜距和分布在东亚亚热带的类群具有较高的净多样化速率, 但淫羊藿属特定的距长对其物种的净多样化速率没有影响; 果实类型、假种皮和气生茎的有无对类群间净多样化速率无影响。本研究表明功能性状的演化和中新世以来东亚地区季风气候的加强导致了鬼臼亚科内部多样性的分布不均。

关键词: 鬼臼亚科, 物种净多样化速率, 蜜距, 淫羊藿属, 东亚亚热带

Abstract

Aims: In this study, our objective is to test the hypothesis that species-rich group possess higher net diversification rates. We focus on the subfamily Podophylloideae in Berberidaceae as our study system. Additionally, we aim to investigate the combined effects of biotic and abiotic factors on diversification rates.

Methods: We reconstructed the phylogeny of Podophylloideae by using 77 chloroplast CDS genes and employing both maximum likelihood and Bayesian inference methods. To estimate divergence time, we used one second calibration and two fossil calibrations. Net diversification rates through time were estimated using BAMM. Additionally, we employed Hidden State Speciation and Extinction analysis (HiSSE) and Quantitative State Speciation and Extinction analysis (QuaSSE) to estimate the effect of four functional traits on diversification rates.

Results: Molecular dating, based on 77 chloroplast CDS genes, showed that Podophylloideae originated approximately 92.75 Myr (95% HPD, 86.84‒95.84 Myr) with a crown age of 85 Myr (95% HPD, 73.19‒94.94 Myr). The net diversification rate began to increase around 23 Myr ago, and the most significant rate shift accrued approximately 21 Myr along the Epimedium stem branch. The analysis of state-dependent diversification rate indicated that taxa with nectar spur in subtropical East Asia possessed a higher net diversification rate. However, the specific spur length in Epimedium did not have a significant effect on net diversification rate. Furthermore, fruit type, the presence of aril, or the presence of aerial stems did not exert any significant effect on net diversification rate.

Conclusions: Our results suggest that the variation in net diversification rates is driven by the presence of nectar spur and the intensification of the East Asian monsoon since the Miocene, which has shaped the discrepancy in species diversity in Podophylloideae.

Key words: Podophylloideae, net diversification rate, nectar spur, Epimedium, subtropical East Asia