Evaluating the Centre-Periphery Hypothesis Through Genomic Phylogeographical Comparisons of Two Sister Species of Liquidambar in East Asia's Tertiary Relict Forests

IF 3.4 2区环境科学与生态学 Q2 ECOLOGY

Journal of Biogeography Pub Date : 2025-02-03 DOI:10.1111/jbi.15098

Tian-Rui Wang, Wu-Qin Xu, Hans-Peter Comes, Xin-Yi Zhang, Jun Chen, Yin-Gang Li, Ying-Xiong Qiu

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引用次数: 0

Abstract

Aim

Understanding the spatial distribution of genetic variation within species is a central tenet in evolutionary biology and conservation biology. This study explores how historical demographic processes and/or environmental factors interact to affect contemporary genetic variation and adaptive potential, with a specific focus on testing the ‘centre-periphery’ hypothesis (CPH).

Location

Subtropical China.

Taxon

Liquidambar.

Methods

We combined comparative phylogeography, landscape genomics and niche modelling to investigate the interplay between demographic history and past/current environmental factors in shaping genetic variation in Liquidambar formosana and L. acalycina, a sister pair of East Asia's Tertiary relict forests.

Results

In both species, core populations occupied highly suitable habitats at highest densities. Consistent with the CPH, population genetic diversity decreased, and differentiation increased, from centre to margin in L. acalycina, but not in L. formosana, likely reflecting different demographic histories and different relative contributions of geography, past (LGM) and current climates to their present-day genetic variation. In addition, L. formosana showed higher adaptive potential to future climate change than L. acalycina.

Main Conclusions

This study demonstrates that differences in contemporary genetic variation and adaptability among closely related species can be explained by contrasting demographic responses to multiple geographic/climatic factors. In turn, it should also expand our understanding of the CPH, while informing future conservation efforts for these two study species.

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通过东亚第三纪遗存森林中两个姐妹种的基因组系统地理学比较来评价中心-外围假说

目的了解物种内遗传变异的空间分布是进化生物学和保护生物学的核心原则。本研究探讨了历史人口过程和/或环境因素如何相互作用，影响当代遗传变异和适应潜力，特别侧重于测试“中心-外围”假设（CPH）。地理位置：中国亚热带。分类单元香。方法采用比较系统地理学、景观基因组学和生态位建模相结合的方法，研究人口历史和过去/现在的环境因素在形成东亚第三纪遗存森林姐妹群——台湾Liquidambar formosana和L. acalycina遗传变异中的相互作用。结果两种物种的核心种群均以最高密度占据高度适宜的生境。与CPH一致的是，种群遗传多样性从中心到边缘下降，分化增加，而台湾l则相反，这可能反映了不同的人口统计学历史以及地理、过去和现在气候对其当前遗传变异的不同相对贡献。此外，台湾L. formosana对未来气候变化的适应潜力高于L. acalycina。本研究表明，近缘物种间当代遗传变异和适应性的差异可以通过对多种地理/气候因素的不同人口反应来解释。反过来，它也应该扩大我们对CPH的理解，同时为这两个研究物种的未来保护工作提供信息。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Biogeography 环境科学-生态学

CiteScore

7.70

自引率

5.10%

发文量

203

审稿时长

2.2 months

期刊介绍： Papers dealing with all aspects of spatial, ecological and historical biogeography are considered for publication in Journal of Biogeography. The mission of the journal is to contribute to the growth and societal relevance of the discipline of biogeography through its role in the dissemination of biogeographical research.