Category Archives: speciation

DNA sequence data shows that this “living fossil” isn’t so fossilized after all

Living fossils are a tricky concept for evolutionary biology. In principle it seems simple: living organisms that closely resemble creatures seen in the fossil record going back millions of years. Usually they’re a single representative of a fossil record containing … Continue reading

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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

Polyploidy in the era of GBS

Ploidy, dear reader, is something that I think about literally all the time. It impacts every facet of my research from the field to the bench to the stats used to analyze data sets. It’s been simultaneously the greatest and the … Continue reading

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Posted in bioinformatics, evolution, genomics, haploid-diploid, Molecular Ecology, the journal, natural history, plants, speciation | Tagged , , , , | 1 Comment

Hybridization and adaptive radiations

As an iconic system in evolutionary biology, I’ve always been interested in African cichlids and the origins of their diversity1. These cichlids represent an adaptive radiation; they’ve evolved rapidly from a single origin to exploit and speciate into open niches … Continue reading

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An Update on the Great BAMM Controversy

Update, 01 August 2016, 2:50PM. This post has been updated to include information contained in the supplemental material of Rabosky et al. 2017, and clarify the difference between branch-specific and tree-wide rate variation. Back in August, I summarized the main … Continue reading

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False detection of “true” species under the multi-species coalescent model

The multi-species coalescent model (MSCM) is the biggest name in the game (if the game is genetic species delimitation). But a new paper from Proceedings of the National Academy of Sciences asks: is the MSCM really doing what we think it’s doing? Some … Continue reading

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The seeds of speciation

You don’t have to get very far into an evolution textbook before you bump into Darwin’s finches, the birds descended from South American finches that colonized the Galapagos Islands and “radiated” into an array of different species, each with a … Continue reading

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Posted in adaptation, birds, Coevolution, evolution, genomics, population genetics, speciation | Tagged , | Leave a comment