Enhanced and asymmetric signatures of hybridization at climatic margins: Evidence from closely related dioecious fig species

doi:10.1016/j.pld.2023.08.003

Plant Diversity ›› 2024, Vol. 46 ›› Issue (02): 181-193.DOI: 10.1016/j.pld.2023.08.003

Enhanced and asymmetric signatures of hybridization at climatic margins: Evidence from closely related dioecious fig species

Jian-Feng Huang^a, Clive T. Darwell^b, Yan-Qiong Peng^a

a. CAS Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Mengla 666303, China;
b. National Center for Genetic Engineering and Biotechnology (BIOTEC), 113 Thailand Science Park, Phahonyothin Road, Khlong Nueng, Khlong Luang, Pathum Thani 12120, Thailand

收稿日期:2023-03-23 修回日期:2023-08-17 出版日期:2024-03-25 发布日期:2024-04-07
通讯作者: Jian-Feng Huang,E-mail:huangjianfeng@xtbg.ac.cn;Yan-Qiong Peng,E-mail:pengyq@xtbg.ac.cn
基金资助:
This work was supported by the National Natural Science Foundation of China (31800313; 32261123001), Applied Basic Research Foundation of Yunnan Province (202301AT070378, 2019FB034), the “Light of West China” Program of the Chinese Academic of Sciences to J.-F. Huang, and Guangzhou Collaborative Innovation Center on Science-tech of Ecology and Landscape.

Enhanced and asymmetric signatures of hybridization at climatic margins: Evidence from closely related dioecious fig species

Jian-Feng Huang^a, Clive T. Darwell^b, Yan-Qiong Peng^a

a. CAS Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Mengla 666303, China;
b. National Center for Genetic Engineering and Biotechnology (BIOTEC), 113 Thailand Science Park, Phahonyothin Road, Khlong Nueng, Khlong Luang, Pathum Thani 12120, Thailand

Received:2023-03-23 Revised:2023-08-17 Online:2024-03-25 Published:2024-04-07
Contact: Jian-Feng Huang,E-mail:huangjianfeng@xtbg.ac.cn;Yan-Qiong Peng,E-mail:pengyq@xtbg.ac.cn
Supported by:
This work was supported by the National Natural Science Foundation of China (31800313; 32261123001), Applied Basic Research Foundation of Yunnan Province (202301AT070378, 2019FB034), the “Light of West China” Program of the Chinese Academic of Sciences to J.-F. Huang, and Guangzhou Collaborative Innovation Center on Science-tech of Ecology and Landscape.

摘要/Abstract

摘要： Hybridization plays a significant role in biological evolution. However, it is not clear whether ecological contingency differentially influences likelihood of hybridization, particularly at ecological margins where parental species may exhibit reduced fitnesses. Moreover, it is unknown whether future ecosystem change will increase the prevalence of hybridization. Ficus heterostyla and F. squamosa are closely related species co-distributed from southern Thailand to southwest China where hybridization, yielding viable seeds, has been documented. As a robust test of ecological factors driving hybridization, we investigated spatial hybridization signatures based on nuclear microsatellites from extensive population sampling across a widespread contact range. Both species showed high population differentiation and strong patterns of isolation by distance. Admixture estimates exposed asymmetric interspecific gene flow. Signatures of hybridization increase significantly towards higher latitude zones, peaking at the northern climatic margins. Geographic variation in reproductive phenology combined with ecologically challenging marginal habitats may promote this phenomenon. Our work is a first systematic evaluation of such patterns in a comprehensive, latitudinally-based clinal context, and indicates that tendency to hybridize appears strongly influenced by environmental conditions. Moreover, that future climate change scenarios will likely alter and possibly augment cases of hybridization at ecosystem scales.

关键词: Hybridization, Heterospecific visitation, Fig, Pollinator wasp, Asymmetric gene flow

Abstract: Hybridization plays a significant role in biological evolution. However, it is not clear whether ecological contingency differentially influences likelihood of hybridization, particularly at ecological margins where parental species may exhibit reduced fitnesses. Moreover, it is unknown whether future ecosystem change will increase the prevalence of hybridization. Ficus heterostyla and F. squamosa are closely related species co-distributed from southern Thailand to southwest China where hybridization, yielding viable seeds, has been documented. As a robust test of ecological factors driving hybridization, we investigated spatial hybridization signatures based on nuclear microsatellites from extensive population sampling across a widespread contact range. Both species showed high population differentiation and strong patterns of isolation by distance. Admixture estimates exposed asymmetric interspecific gene flow. Signatures of hybridization increase significantly towards higher latitude zones, peaking at the northern climatic margins. Geographic variation in reproductive phenology combined with ecologically challenging marginal habitats may promote this phenomenon. Our work is a first systematic evaluation of such patterns in a comprehensive, latitudinally-based clinal context, and indicates that tendency to hybridize appears strongly influenced by environmental conditions. Moreover, that future climate change scenarios will likely alter and possibly augment cases of hybridization at ecosystem scales.

Key words: Hybridization, Heterospecific visitation, Fig, Pollinator wasp, Asymmetric gene flow

Jian-Feng Huang, Clive T. Darwell, Yan-Qiong Peng. Enhanced and asymmetric signatures of hybridization at climatic margins: Evidence from closely related dioecious fig species[J]. Plant Diversity, 2024, 46(02): 181-193.

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Enhanced and asymmetric signatures of hybridization at climatic margins: Evidence from closely related dioecious fig species

Enhanced and asymmetric signatures of hybridization at climatic margins: Evidence from closely related dioecious fig species

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