动物学研究2023，Vol.44Issue(1) ：3-19.DOI:10.24272/j.issn.2095-8137.2022.108

A wide hybrid zone mediated by precipitation contributed to confused geographical structure of Scutiger boulengeri

Xiu-Qin Lin Yin-Meng Hou Wei-Zhao Yang Sheng-Chao Shi Pu-Yang Zheng Chung-Kun Shih Jian-Ping Jiang Feng Xie
动物学研究2023，Vol.44Issue(1) ：3-19.DOI:10.24272/j.issn.2095-8137.2022.108
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  • 维普
  • 万方数据

A wide hybrid zone mediated by precipitation contributed to confused geographical structure of Scutiger boulengeri

Xiu-Qin Lin 1Yin-Meng Hou 1Wei-Zhao Yang 1Sheng-Chao Shi 1Pu-Yang Zheng 1Chung-Kun Shih 2Jian-Ping Jiang 3Feng Xie3
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作者信息

  • 1. CAS Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization and Ecological Restoration Biodiversity Conservation Key Laboratory of Sichuan Province,Chengdu Institute of Biology,Chinese Academy of Sciences,Chengdu,Sichuan 610041,China;University of Chinese Academy of Sciences,Beijing 100049,China
  • 2. College of Life Sciences,Capital Normal University,Beijing 100048,China;Department of Paleobiology,National Museum of Natural History,Smithsonian Institution,Washington DC 20013-7012,USA
  • 3. CAS Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization and Ecological Restoration Biodiversity Conservation Key Laboratory of Sichuan Province,Chengdu Institute of Biology,Chinese Academy of Sciences,Chengdu,Sichuan 610041,China;University of Chinese Academy of Sciences,Beijing 100049,China;Mangkang Biodiversity and Ecological Station,Xizang Ecological Safety Monitor Network,Changdu,Xizang 854500,China
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Abstract

Confused geographical structure of a population and mitonuclear discordance are shaped by a combination of rapid changes in population demographics and shifts in ecology.In this study,we generated a time-calibrated phylogeny of Scutiger boulengeri,an endemic Xizang alpine toad occurring in mountain streams on the Qinghai-Xizang(Tibet)Plateau(QTP).Based on three mitochondrial DNA(mtDNA)genes,eight clades were assigned to three deeply divergent lineages.Analysis of nuclear DNA(nuDNA)genes revealed three distinct clusters without geographic structure,indicating significantly high rates of gene flow.Coalescent theory framework analysis(approximate Bayesian computation model DIYABC and Migrate-N)suggested that divergence of the main intraspecific clusters was the result of hybridization after secondary contact in the Holocene around 0.59 million years ago(Ma).The ratio of mtDNA FST(fixation index)to nuDNA FST was 2.3,thus failing to show male-biased dispersal.Geographic cline analysis showed that a wide hybrid zone was initially established in southwestern China,without significant reproductive isolation but with strong introgression in S.boulengeri,suggesting high hybrid fitness.Furthermore,mtDNA genes exhibited isolation by distance(IBD)while nuDNA genes exhibited significant isolation by environment(IBE).Results suggested that mitonuclear discordance may have initially been caused by geographic isolation,followed by precipitation-mediated hybridization,producing a wide hybrid zone and geographic structure confusion of nuDNA genes in S.boulengeri.This study indicated that complicated historical processes may have led to specific genetic patterns,with a specific climate factor facilitating gene flow in the system.

Key words

Hybrid zone/Mitonuclear discordance/Precipitation/Genetic structure/Secondary contact

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基金项目

Second Tibetan Plateau Scientific Expedition and Research Program(STEP)(STEP)

Second Tibetan Plateau Scientific Expedition and Research Program(STEP)(2019QZKK05010503)

Biodiversity Survey and Assessment Project of the Ministry of Ecology and Environment,China(2019HJ2096001006)

Construction of Basic Conditions Platform of Sichuan Science and Technology Department(2019JDPT0020)

China Biodiversity Observation Networks(Sino BON)()

出版年

2023
动物学研究
中国科学院昆明动物研究所 中国动物学会

动物学研究

CSTPCDCSCD
影响因子：0.582
ISSN：0254-5853
参考文献量81
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