globalchange  > 气候减缓与适应
DOI: 10.1007/s00606-018-1552-x
WOS记录号: WOS:000454914600001
论文题名:
Why polyploid exceptionalism is not accompanied by reduced extinction rates
作者: Levin, Donald A.
通讯作者: Levin, Donald A.
刊名: PLANT SYSTEMATICS AND EVOLUTION
ISSN: 0378-2697
EISSN: 2199-6881
出版年: 2019
卷: 305, 期:1, 页码:1-11
语种: 英语
英文关键词: Extinction ; Genetic variation ; Independent origins ; Isolate selection ; Neopolyploids ; Polyploidy
WOS关键词: CLIMATE-CHANGE ; GENE FLOW ; INBREEDING DEPRESSION ; EVOLUTIONARY CONSEQUENCES ; ECOLOGICAL DIFFERENTIATION ; PHYLOGENETIC DIVERSITY ; GENOME DUPLICATION ; NICHE BREADTH ; PLOIDY LEVEL ; RANGE SIZE
WOS学科分类: Plant Sciences ; Evolutionary Biology
WOS研究方向: Plant Sciences ; Evolutionary Biology
英文摘要:

In spite of their success during the past several millions of years, recent analyses indicate that polyploid species may have higher extinction rates than their diploid relatives. The idea that neopolyploid species are relatively short-lived is antithetical to the notion of polyploid exceptionalism. I propose that young, established polyploid species have unusually high extinction rates due to demographic and genetic challenges and that early demise accounts for the elevated extinction of polyploid species as a whole. Polyploid species are composed of conspecific lineages (each of an independent origin). Each origin is associated with a genetic and demographic bottleneck which reduces their abilities to cope with environment perturbations. The greater the number of independently originated lineages, the longer a polyploid species is likely to persist, given that the lineages are genetically/ecologically divergent. Autopolyploids appear to have much higher extinction rates than allopolyploids, even though the formation frequency in autopolyploids may be orders of magnitude greater. Niche differences between polyploids and their progenitors may be enhanced via the differential survival of the most divergent polyploids relative to their progenitors. It seems to be the rarely successful polyploid that flourishes during times of environmental alteration and that leaves an enduring genomic legacy.


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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/124590
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作者单位: Univ Texas Austin, Dept Integrat Biol, Austin, TX 78712 USA

Recommended Citation:
Levin, Donald A.. Why polyploid exceptionalism is not accompanied by reduced extinction rates[J]. PLANT SYSTEMATICS AND EVOLUTION,2019-01-01,305(1):1-11
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