Tag Archives: isolation by distance

For population genetics, continuous space might be the final frontier

My first exposure to this issue was probably reading Whitlock and McCauley’s 1999 review of the tricky relationship between pairwise genetic differentiation and actual migration rates. Classic theory by none other than Sewall Wright related the differentiation index FST to … Continue reading

Posted in association genetics, evolution | Tagged , , | 1 Comment

Clinal genomic variation in Drosophila species

Two recent manuscripts describe adaptive evolutions to clinal/latitudinal variations in Drosophila species to supplement a growing wealth of recent studies on geographic variation and adaptive evolution in natural populations of fruitflies (eg. see Kao et al. 2015, Zhao et al. … Continue reading

Posted in adaptation, evolution, genomics, Molecular Ecology, the journal, natural history, population genetics | Tagged , , , , , | Leave a comment

What's the most replicated finding in population genetics?

DrugMonkey tells a tale of a specific finding in addiction research — that rats provided with an intravenous drip of cocaine solution will push a lever to self-administer the drug — which has been replicated countless times over the decades. … Continue reading

Posted in population genetics | Tagged , | 4 Comments

Adapting to the new wave of isolation by environment

Isolation by environment, not distance, explains the genetic relationship between an avian taxon among Madrean Sky Islands, according to a new study appearing in Molecular Ecology by Manthey and Moyle. The authors throw the kitchen sink of new analyses at a combination … Continue reading

Posted in adaptation, Molecular Ecology, the journal, phylogeography | Tagged , , | 1 Comment

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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Isolation by environment explains why the grass isn't always greener

Ever since Sewall Wright introduced isolation by distance in 1943, the interplay between genetic differentiation and geographic distance has been a foundational, sometimes frustrating, aspect of population genetics studies. But distance isn’t just distance. The walk to my car isn’t any longer when … Continue reading

Posted in methods, Molecular Ecology, the journal, population genetics | Tagged , , , | 2 Comments

Genes … in … space!

It’s something of a classic result in human population genomics: Go out and genotype thousands of people at thousands of genetic markers. (This is getting easier to do every day.) Then summarize the genetic variation at your thousands of markers … Continue reading

Posted in population genetics | Tagged , , , , | 1 Comment

Isolating isolation by distance

Update, 29 Jan 2015: This post has been edited to remove a video clip from the movie “Chinatown,” which was jarring and really just unnecessary, as pointed out in the comments. At its most basic level, population genetics is about … Continue reading

Posted in methods, population genetics | Tagged , , , , | 12 Comments