Category Archives: selection

The genomic architecture of ecological speciation

Speciation reshapes the ways genetic diversity is distributed in the genome — it’s been said that the establishment of reproductive isolation is essentially the evolution of genome-wide linkage disequilibrium. The “genomic islands of speciation” model of ecological isolation imagines genome-wide … Continue reading

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Posted in association genetics, linkage mapping, selection, speciation | Tagged | Leave a comment

#Evol2017 catch-up — Effects of range expansions on mating system

Two weeks (more about that in a post I’ve written for Wednesday!) after the closing day of the 2017 Evolution Meetings, the Molecular Ecologists have all dispersed from Portland, though some may have left things behind! Still, the conference was so … Continue reading

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Posted in conferences, evolution, mating system, natural history, phylogeography, plants, selection | Tagged , , , , , | Leave a comment

When less might be more: The evolution of reduced genomes

The advent of affordable genome sequencing has provided us with a wealth of data. Researchers have sequenced everything from Escherichia coli (4.6 Mbp genome size), to sea urchins (810 Mbp), chimpanzees (3.3 Gbp), and humans (3.2 Gbp). Then there are the … Continue reading

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Posted in adaptation, Coevolution, evolution, genomics, microbiology, population genetics, selection | Tagged , , , | Leave a comment

On hyRAD-X, another option for museum genomics

Last year, I profiled Suchan et al.’s “hyRAD” method for reduced-representation genome sequencing of degraded sources of DNA using RAD probes. While it’s too early to say whether hyRAD will be widely used by molecular ecologists looking to integrate historic … Continue reading

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Posted in genomics, methods, natural history, next generation sequencing, phylogenetics, phylogeography, population genetics, RNAseq, selection, transcriptomics | Tagged , , , | Leave a comment

Shared patterns of genomic diversity across populations of distantly related taxa

Genomic diversity is shaped by the complex interplay between the effects of genetic drift and natural selection among populations. Several of these effects, especially those of linked selection at neutral sites, adaptive introgression, and barriers to migration (often called “genomic … Continue reading

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Posted in adaptation, bioinformatics, birds, evolution, genomics, population genetics, selection | Tagged , , , , , | Leave a comment

To RADseq or not to RADseq?

It’s a cliche to say that we live in a moment of unprecedented possibility for molecular ecology, as high-throughput sequencing methods drive the cost of collecting DNA sequence data ever lower. But at the same time, it’s a tricky moment, … Continue reading

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Posted in adaptation, association genetics, genomics, methods, next generation sequencing, selection | Tagged , , , , | 7 Comments

Different ways to have sex, yet still be a weed

Baker (1955) noticed that when mates are lacking, the ability to undergo self-fertilization will greatly enhance colonization success. Uniparental reproduction seems to be common in colonizing species, whether it’s from a continent to an oceanic island, during a biological invasion or during range … Continue reading

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Posted in Coevolution, comparative phylogeography, evolution, natural history, phylogeography, population genetics, selection | Tagged , , , , , | Leave a comment