Tag Archives: ecological speciation

It’s not the size that counts: teeny tiny SAR11 bacteria play a big role in our oceans

Microbes account for a huge chunk of the diversity on this planet, are essential in all sorts of biogeochemical processes, and we are still figuring out how everything is related. Teeny tiny bacterial cells are abundant both on land as … Continue reading

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Posted in adaptation, community ecology, evolution, metagenomics, microbiology | Tagged , , , , , | Leave a comment

Divergence and Linked Background Selection

We have widely discussed the reduction in neutral diversity due to demography and linked selection effects (e.g. selective sweeps and hitchhiking, or background selection) in several previous posts (e.g see here, here, and here). However, how linked selection affects neutral divergence … Continue reading

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Posted in evolution, genomics, methods, selection, speciation, theory | Tagged , , , , , | 1 Comment

Genomics of Hybridization – Part 1

In a series of articles, I will discuss recent advances in hybridization genomics – the fundamentals of adaptive introgression, “islands of speciation”, differential gene flow, and linked selection have been discussed in my previous posts (here, here, and also at … Continue reading

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Posted in adaptation, evolution, genomics, methods, natural history, next generation sequencing, pedigree, phylogenetics, plants, population genetics, RNAseq, software, speciation, species delimitation, STRUCTURE, theory, transcriptomics | Tagged , , , , , , | Leave a comment

Earthquakes and rapid evolution

The 1964 Alaskan earthquake was landscape-altering in creating/uplifting numerous islands in the Gulf of Alaska, providing an ideal system to study adaptive evolution of diversification in affected species – the threespine stickleback (Gasterosteus aculeatus) being a widely studied example. In … Continue reading

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Posted in adaptation, evolution, genomics, natural history, next generation sequencing, phylogeography, population genetics, selection, STRUCTURE | Tagged , , , , , , | Leave a comment

Anti-predatory adaptations in sticklebacks and butterflies

Two recent studies analyze character shifts in response to different selection regimes – (1) Mullerian mimicry wing patterns in Heliconius butterflies, and (2) anti-intraguild-predator adaptations in armor and shape of threespine sticklebacks. Hoyal Cuthill and Charleston 2015 Wing patterning genes … Continue reading

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Posted in adaptation, Coevolution, evolution, genomics, natural history, phylogenetics, phylogeography, population genetics, selection, speciation | Tagged , , , | Leave a comment

Genomics of domestication in chicken and cattle

Two recent studies attempt to understand the process of adaptive evolution in domestication and artificial selection by characterizing (a) sweeps, and their association with phenotypes in extant hybrid lines (Sheng et al. 2015), and (b) phylogenomic position of an extinct … Continue reading

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Posted in adaptation, bioinformatics, domestication, evolution, genomics, natural history, Paleogenomics, phylogeography, population genetics, selection, speciation, STRUCTURE | Tagged , , , , , , | 1 Comment

On background selection in Ficedula flycatchers

Several recent studies (including those I wrote about last week) use genome-wide scans of differentiation to understand evolutionary mechanisms behind high or low divergence. However, there has been contentious support for and against these differentiation islands being due to differential … Continue reading

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Posted in adaptation, Coevolution, evolution, genomics, natural history, population genetics, selection, speciation, theory | Tagged , , , , , , | Leave a comment