Estimating F-statistics for the analysis of population structure.
Bruce S. Weir,C. Clark Cockerham +1 more
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The purpose of this discussion is to offer some unity to various estimation formulae and to point out that correlations of genes in structured populations, with which F-statistics are concerned, are expressed very conveniently with a set of parameters treated by Cockerham (1 969, 1973).Abstract:
This journal frequently contains papers that report values of F-statistics estimated from genetic data collected from several populations. These parameters, FST, FIT, and FIS, were introduced by Wright (1951), and offer a convenient means of summarizing population structure. While there is some disagreement about the interpretation of the quantities, there is considerably more disagreement on the method of evaluating them. Different authors make different assumptions about sample sizes or numbers of populations and handle the difficulties of multiple alleles and unequal sample sizes in different ways. Wright himself, for example, did not consider the effects of finite sample size. The purpose of this discussion is to offer some unity to various estimation formulae and to point out that correlations of genes in structured populations, with which F-statistics are concerned, are expressed very conveniently with a set of parameters treated by Cockerham (1 969, 1973). We start with the parameters and construct appropriate estimators for them, rather than beginning the discussion with various data functions. The extension of Cockerham's work to multiple alleles and loci will be made explicit, and the use of jackknife procedures for estimating variances will be advocated. All of this may be regarded as an extension of a recent treatment of estimating the coancestry coefficient to serve as a mea-read more
Citations
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Genome architecture enables local adaptation of Atlantic cod despite high connectivity.
Julia Maria Isis Barth,Paul R. Berg,Per R. Jonsson,Sara Bonanomi,Sara Bonanomi,Hanna Corell,Jakob Hemmer-Hansen,Kjetill S. Jakobsen,Kerstin Johannesson,Per Erik Jorde,Halvor Knutsen,Halvor Knutsen,Per-Olav Moksnes,Bastiaan Star,Nils Christian Stenseth,Nils Christian Stenseth,Henrik Svedäng,Sissel Jentoft,Sissel Jentoft,Carl André +19 more
TL;DR: This study provides new insights into the potential of local adaptation in high gene flow species within fine geographical scales and highlights the importance of genome architecture in analyses of ecological adaptation.
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The history of Seasonally Dry Tropical Forests in eastern South America: inferences from the genetic structure of the tree Astronium urundeuva (Anacardiaceae).
Sofia Caetano,Darién E. Prado,R. T. Pennington,S. Beck,Ary Teixeira de Oliveira-Filho,R. Spichiger,Yamama Naciri +6 more
TL;DR: Arguments that favour the existence of a previously more continuous formation of SDTF in eastern South America are provided.
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Genetic variation in wild and cultivated populations of the haploid– diploid red alga gracilaria chilensis: how farming practices favor asexual reproduction and heterozygosity
Marie-Laure Guillemin,Sylvain Faugeron,Christophe Destombe,Frédérique Viard,Juan A. Correa,Myriam Valero +5 more
TL;DR: This study suggested that cultural practices in the southern part of the country contributed to the spread of selected genotypes at a local scale and document for the first time that involuntary selection could operate during the first step of domestication in a marine plant.
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Quantifying the constraining influence of gene flow on adaptive divergence in the lake-stream threespine stickleback system
TL;DR: Stream populations of threespine stickleback that experience different levels of gene flow from a parapatric lake population are illustrated, illustrating ways of doing so using gene flow data with morphological and habitat data and parameterized a quantitative genetic model of adaptive divergence.
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Hybridization and phylogeography of the Mozambique tilapia Oreochromis mossambicus in southern Africa evidenced by mitochondrial and microsatellite DNA genotyping
Maria Eugenia D’Amato,Maria Eugenia D’Amato,Maria M. Esterhuyse,Ben C. W. van der Waal,D. Brink,Filip Volckaert +5 more
TL;DR: The objective of this work was to study the genetic diversity of the Mozambique tilapia (Oreochromis mossambicus) in its native range, southern Africa, and provide a method for identifying hybrids with genetic markers.
References
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Journal ArticleDOI
Analysis of Gene Diversity in Subdivided Populations
TL;DR: A method is presented by which the gene diversity (heterozygosity) of a subdivided population can be analyzed into its components, i.e., the gene diversities within and between subpopulations.
Book
The jackknife, the bootstrap, and other resampling plans
TL;DR: The Delta Method and the Influence Function Cross-Validation, Jackknife and Bootstrap Balanced Repeated Replication (half-sampling) Random Subsampling Nonparametric Confidence Intervals as mentioned in this paper.
Journal ArticleDOI
The interpretation of population structure by F-statistics with special regard to systems of mating
TL;DR: It was found that there is no equilibrium in either case short of complete fixation locally, in spite of the linear increase in number of different ancestors with increasing number of ancestral generations, in contrast to systems (half first cousin or second cousin) in which this increase is more than linear and a steady state is rapidly attained with respect to heterozygosis.
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