干旱区生态环境知识资源中心(Arid): Response of xerophytic plants to glacial cycles in southern South America

Arid

DOI	10.1093/aob/mcy235
	Response of xerophytic plants to glacial cycles in southern South America
	Ossa, Carmen G.; Montenegro, Paz; Larridon, Isabel; Perez, Fernanda
通讯作者	Ossa, CG (corresponding author), Pontificia Univ Catolica Chile, Dept Ecol, Santiago, Chile. ; Ossa, CG (corresponding author), Univ Mayor, Fac Ciencias, Escuela Med Vet, Santiago, Chile.
来源期刊	ANNALS OF BOTANY
ISSN	0305-7364
EISSN	1095-8290
出版年	2019
卷号	124 期号:1 页码:15-25
英文摘要	Background and Aim Quaternary glaciations strongly affected the distribution of species from arid and semi-arid environments, as temperature drops were accompanied by strong fluctuations in rainfall. In this study, we examined the response of xerophytic species to glacial cycles, determining the genetic patterns and climatic niche of Echinopsis chiloensis var. chiloensis, an endemic columnar cactus of arid and semi-arid regions of Chile. Methods We analysed 11 polymorphic microsatellites for 130 individuals from 13 populations distributed across the entire distribution of the species. We examined genetic diversity and structure, identified possible patterns of isolation by distance (IBD) and tested two competing population history scenarios using Approximate Bayesian Computation. The first scenario assumes a constant population size while the second includes a bottleneck in the southern population. The latter scenario assumed that the southernmost populations experienced a strong contraction during glaciation, followed by a postglacial expansion; by contrast, the area of the northernmost populations remained as a stable refugium. We also used ecological niche modelling (ENM) to evaluate the location and extension of suitable areas during the Last Glacial Maximum (LGM) and the mid-Holocene. Key Results We found a decline in genetic diversity towards high latitudes and a significant IBD pattern that together with ENM predictions suggest that E. chiloensis var. chiloensis experienced range contraction northwards during wet-cold conditions of the LGM, followed by expansion during aridification of the mid-Holocene. In addition to IBD, we detected the presence of a strong barrier to gene flow at 32 degrees 30'S, which according to coalescence analysis occurred 44 kyr BP. The resulting genetic clusters differed in realized climatic niche, particularly in the variables related to precipitation. Conclusions Our results suggest that the cactus E. chiloensis var. chiloensis experienced range contraction and fragmentation during the wet-cold conditions of the LGM, which may have facilitated ecological differentiation between northern and southern populations, promoting incipient speciation.
英文关键词	Desert Echinopsis chiloensis ecological niche modelling glacial fragmentation microsatellites post-glacial expansion phylogeography
类型	Article
语种	英语
开放获取类型	Green Published, Bronze
收录类别	SCI-E
WOS记录号	WOS:000493044300004
WOS关键词	POPULATION GENETIC-STRUCTURE ; CHIHUAHUAN DESERT ; COLUMNAR CACTUS ; POSTGLACIAL COLONIZATION ; CENTRAL CHILE ; DNA-SEQUENCE ; DIVERSITY ; PATTERNS ; CACTACEAE ; PHYLOGEOGRAPHY
WOS类目	Plant Sciences
WOS研究方向	Plant Sciences
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/369295
作者单位	[Ossa, Carmen G.; Perez, Fernanda] Pontificia Univ Catolica Chile, Dept Ecol, Santiago, Chile; [Montenegro, Paz; Perez, Fernanda] Inst Ecol & Biodivers IEB, Santiago, Chile; [Ossa, Carmen G.] Univ Mayor, Fac Ciencias, Escuela Med Vet, Santiago, Chile; [Montenegro, Paz] Univ Mayor, Dept Ciencias Ecol, Santiago, Chile; [Larridon, Isabel] Royal Bot Gardens, Richmond TW9 3AE, Surrey, England; [Larridon, Isabel] Univ Ghent, Dept Biol, Res Grp Spermatophytes, KL Ledeganckstr 35, B-9000 Ghent, Belgium
推荐引用方式 GB/T 7714	Ossa, Carmen G.,Montenegro, Paz,Larridon, Isabel,et al. Response of xerophytic plants to glacial cycles in southern South America[J],2019,124(1):15-25.
APA	Ossa, Carmen G.,Montenegro, Paz,Larridon, Isabel,&Perez, Fernanda.(2019).Response of xerophytic plants to glacial cycles in southern South America.ANNALS OF BOTANY,124(1),15-25.
MLA	Ossa, Carmen G.,et al."Response of xerophytic plants to glacial cycles in southern South America".ANNALS OF BOTANY 124.1(2019):15-25.