Category Archives: population genetics

Discordance in ancestry inference using human mtDNA and autosomes

Mitochondrial haplotypes have been used extensively over the last few decades for inference of a population structure in humans. Key findings from these studies include what has come to be known as the “Mitochondrial Eve” hypothesis (see the controversial Cann, … Continue reading

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SpaceMix, and a brief history of Spatial Genetics

Incorporating spatial data to inform studies of the population demography of a species has a long history of interest. From inferring geographical clines in Principal Components Analyses (Menozzi et al. 1978), using location data as “informative priors” during model-based estimation … Continue reading

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A population genetic R-evolution

Uphill, both ways, in the snow, without shoes … quite apt when thinking of the dark days, in the not too distant past, in which a separate input file was needed for each popgen analysis in order to use a … Continue reading

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Species and sensibility

Pante et al. (2014) performed a literature review of marine population connectivity in order to illustrate the biased estimates of connectivity which can result from the failure to recognize an evolutionary-relevant unit, such as a species. When exploring the connectivity … Continue reading

Posted in adaptation, community ecology, conservation, DNA barcoding, natural history, next generation sequencing, phylogenetics, population genetics, speciation, theory | 2 Comments

Recent Ancestry of the USA and the 100k Genome Project

Holiday presents for pop-gen enthusiasts come in the form of data – boatloads of it! The past two weeks saw the announcements of two neat studies that spell monumental steps toward our understanding of the genetics of mixed populations. With … Continue reading

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Totally RAD, Part 2

Restriction site-associated DNA sequencing (RADseq) is quickly becoming the go-to methodology for collecting population genetic data, and the methodological difficulties of a technique that is exploding in popularity are coming along with it. Last month, Stacy pointed you towards a … Continue reading

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Hybrid speciation is for the birds (and plants, reptiles, fish, and insects)

R. A. Fisher once called hybridization ‘‘the grossest blunder in sexual preference which we can conceive of an animal making.” While there may be negative fitness consequences for an individual who mates across species boundaries, the evolutionary significance of hybridization in speciation, introgression, … Continue reading

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haploidy, diploidy, polyploidy … not a problem

Investigating pairwise relatedness is fundamental to the characterization of the mating system and inferring genetic structure. If no pedigree exists, then relatedness is estimated from genetic markers (e.g., microsatellite loci) using method-of-moment or maximum-likelihood methods. However, not all individuals in … Continue reading

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C.L. Gloger’s favorite owl

Biologists love clines. We’ve been mentally masticating on clines for decades. Clines in body size. Clines in color. Clines in heart size! Clines that go in circles! Recognizing clinal patterns in phenotypes or genotypes is fun, but discovering the mechanisms behind … Continue reading

Posted in adaptation, Molecular Ecology, the journal, population genetics | Tagged , , | Leave a comment

Exotic gene flow surveillance

Exotic forest plantations often cover large areas and, as such, may contribute female gametes, male gametes and/or zygotes to native stands. In seed plants, these three components of exotic gene flow have not been distinguished, though they will have different … Continue reading

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