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 p...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.展开更多
2024年5月23日,在国际测量师联合会(International Federation of Surveyors,FIG)第47届会员代表大会上,《北京测绘》编委、第十四届全国政协委员、中国测绘科学研究院院长、中国测绘学会副理事长燕琴研究员当选新一届FIG副主席,任期为2...2024年5月23日,在国际测量师联合会(International Federation of Surveyors,FIG)第47届会员代表大会上,《北京测绘》编委、第十四届全国政协委员、中国测绘科学研究院院长、中国测绘学会副理事长燕琴研究员当选新一届FIG副主席,任期为2025-2028年。FIG成立于1878年7月18日,是世界各国测绘学术团体联合组成的综合性学术组织,FIG的宗旨是联合世界各国及各地区的测量工作者、测绘工作团体、主管测绘的国家结构,讨论本专业共同关心的话题,建立各成员国测量学会间的联系,报道各国测量工作的成就,推广科研成果,组织专业培训,促进各国专业人员的交流,推动测量科学的发展。展开更多
基金supported by the National Natural Science Foundation of China (3180031332261123001)+1 种基金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。
文摘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.
文摘2024年5月23日,在国际测量师联合会(International Federation of Surveyors,FIG)第47届会员代表大会上,《北京测绘》编委、第十四届全国政协委员、中国测绘科学研究院院长、中国测绘学会副理事长燕琴研究员当选新一届FIG副主席,任期为2025-2028年。FIG成立于1878年7月18日,是世界各国测绘学术团体联合组成的综合性学术组织,FIG的宗旨是联合世界各国及各地区的测量工作者、测绘工作团体、主管测绘的国家结构,讨论本专业共同关心的话题,建立各成员国测量学会间的联系,报道各国测量工作的成就,推广科研成果,组织专业培训,促进各国专业人员的交流,推动测量科学的发展。