气候变化领域集成服务门户(CCPortal): Contrasting genetic signal of recolonization after rainforest fragmentation in African trees with different dispersal abilities

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DOI	10.1073/pnas.2013979118
	Contrasting genetic signal of recolonization after rainforest fragmentation in African trees with different dispersal abilities
	Piñeiro R.; Hardy O.J.; Tovar C.; Gopalakrishnan S.; Vieira F.G.; Gilbert T.M.P.
发表日期	2021
ISSN	0027-8424
卷号	118 期号:27
英文摘要	Although today the forest cover is continuous in Central Africa, this may have not always been the case, as the scarce fossil record in this region suggests that arid conditions might have significantly reduced tree density during the ice ages. Our aim was to investigate whether the dry ice age periods left a genetic signature on tree species that can be used to infer the date of the past fragmentation of the rainforest. We sequenced reduced representation libraries of 182 samples representing five widespread legume trees and seven outgroups. Phylogenetic analyses identified an early divergent lineage for all species in West Africa (Upper Guinea) and two clades in Central Africa: Lower Guinea-North and Lower Guinea-South. As the structure separating the Northern and Southern clades-congruent across species-cannot be explained by geographic barriers, we tested other hypotheses with demographic model testing using δαδι. The best estimates indicate that the two clades split between the Upper Pliocene and the Pleistocene, a date compatible with forest fragmentation driven by ice age climatic oscillations. Furthermore, we found remarkably older split dates for the shade-tolerant tree species with nonassisted seed dispersal than for light-demanding species with long-distance wind-dispersed seeds. Different recolonization abilities after recurrent cycles of forest fragmentation seem to explain why species with long-distance dispersal show more recent genetic admixture between the two clades than species with limited seed dispersal. Despite their old history, our results depict the African rainforests as a dynamic biome where tree species have expanded relatively recently after the last glaciation. © 2021 National Academy of Sciences. All rights reserved.
英文关键词	Genotyping by sequencing; Glacial refugia; Phylogeography; Spatial gradients of genetic diversity; Tropical Africa
语种	英语
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/238694
作者单位	The GLOBE Institute, University of Copenhagen, Copenhagen, 1353, Denmark; Unit of Evolutionary Biology and Ecology, Faculté des Sciences, Université Libre de Bruxelles, Brussels, B-1050, Belgium; Geography, College of Life and Environmental Sciences, CLES, University of Exeter, Exeter, EX4 4RJ, United Kingdom; Jodrell Laboratory, Royal Botanic Gardens, Kew, Richmond, TW9 3AB, United Kingdom; University Museum, Norwegian University of Science and Technology, Trondheim, N-7491, Norway
推荐引用方式 GB/T 7714	Piñeiro R.,Hardy O.J.,Tovar C.,et al. Contrasting genetic signal of recolonization after rainforest fragmentation in African trees with different dispersal abilities[J],2021,118(27).
APA	Piñeiro R.,Hardy O.J.,Tovar C.,Gopalakrishnan S.,Vieira F.G.,&Gilbert T.M.P..(2021).Contrasting genetic signal of recolonization after rainforest fragmentation in African trees with different dispersal abilities.Proceedings of the National Academy of Sciences of the United States of America,118(27).
MLA	Piñeiro R.,et al."Contrasting genetic signal of recolonization after rainforest fragmentation in African trees with different dispersal abilities".Proceedings of the National Academy of Sciences of the United States of America 118.27(2021).