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Demographic Processes Linked to Genetic Diversity and Positive selection across a Species’ Range

Plant Communications 2020年第6期1卷 72-84页

作者： Yvonne Willi Marco Fracassetti Olivier Bachmann Josh Van Buskirk Department of Environmental Sciences University of BaselSch€onbeinstrasse 6CH-4056 BaselSwitzerland Department of Evolutionary Biology and Environmental Studies University of Z€urichCH-8057 Z€urichSwitzerland Department of Ecology Environment and Plant SciencesScience for Life LaboratoryStockholm UniversitySE-10691 StockholmSweden

Demography determines the strength of genetic drift,which generally reduces genetic variation and the efficacy of ***,we disentangled the importance of demographic processes at a local scale(census size and mating system)and at a species-range scale(old split between population clusters,recolonization after the last glaciation cycle,and admixture)in determining within-population genomic diversity and genomic signatures of positive *** were based on re-sequence data from 52 populations of North American Arabidopsis lyrata collected across its entire *** mating system and range dynamics since the last glaciation cycle explained around 60%of the variation in genomic diversity among populations and 52%of the variation in the signature of positive *** was lowest in selfing compared with outcrossing populations and in areas further away from glacial *** parallel,reduced positive selectionwas found in selfing populations and in populations with a longer route of postglacial range *** signature of positive selection was also reduced in populations without *** conclude that recent range expansion can have a profound influence on diversity in coding and non-coding DNA,similar in magnitude to the shift toward *** limits may in fact be caused by reduced effective population size and compromised positive selection in recently colonized parts of the range.

关键词： admixture-dependent selection directional selection genetic drift range expansion selfing small population size

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Genome-wide SNP genotyping highlights adaptive divergence in finless porpoises,with taxonomic implications and conservation recommendations

Genome-wide SNP genotyping highlights adaptive divergence in...

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第七届全国野生动物生态与资源保护学术研讨会

作者： Guang Yang,Shuzhen Li,Shixia Xu,Huirong Wan,Heyi Ji,Kaiya Zhou Jiangsu Key Laboratory for Biodiversity and Biotechnology,College of Life Sciences,Nanjing Normal University,Nanjing 210046,China

Single nucleotide polymorphisms(SNPs)are rapidly becoming the genetic markers of choice in studies of ecology,evolution and conservation of natural populations because of their high capacity to access variability across the *** the present study,a total of 140 ideal SNPs were isolated from the finless porpoise genome to conduct an evolutionary and conservation study especially for addressing population genetic structure and adaptive differentiation of this *** clustering and PCA analyses all suggested that finless porpoises in Chinese waters could be divided into three distinct genetic groupings,with some individual admixture in the overlapped distribution *** provided some support either for a subdivision of three geographical populations /subspecies for the finless porpoise,or for an identification of two species recently suggested for the two finless porpoise forms overlapping in the Taiwan *** levels of within-population genetic variation(mean HE = 0.3525,SD = 0.1188)and significant differentiation among populations(FST values ranging from 0.0727 to 0.1358,Pdirectional or local adaptation based on the ’global’ population at 99%quantiles,whereas eight(5.7%)and three(2.1%)were considered as positive and negative outliers with FST at the 95% confidence level in pairwise comparison,with one locus overlapping between both *** outlier SNPs were identified from functionally known genes,further showing potential adaptation *** the significant genetic structure and especially the significant adaptive divergence of freshwater porpoises with their marine counterparts,in combination with its unique distribution in the freshwater Yangtze

关键词： Finless porpoise SNPs genetic diversity population structure directional selection adaptive divergence

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