Category Archives: selection

When less might be more: The evolution of reduced genomes

Images courtesy of wiki commons 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 … Continue reading

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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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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

Dishing out Art: “Soiling” our microbiology curriculum

Sarah Adkins wrote this post as a final project for Stacy Krueger-Hadfield’s Science Communication course at the University of Alabama at Birmingham. She is a MS student working with Dr. Jeffrey Morris at UAB. They are looking at how microbes (i.e., phytoplankton and E. … Continue reading

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Free to go but required to stay: contrasting views on mitochondrial relationships

Ever since a bacterium found itself mysteriously engulfed in our eukaryotic ancestor, things have been, uh, complicated regarding our two genomes. One is big, one is small. One is circular, one is linear. One is numerous in each cell, the … Continue reading

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