Category Archives: theory

Sweeps and Demographic Inference

Population genetics presents us with numerous conundrums – several of which have to do with how the same genomic disposition can be “reached” over evolutionary time with multiple alternate demographic or selective processes. I have discussed several of these issues … Continue reading

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What makes a range?

Why do species have restricted geographic distributions? Classic ecological perspectives tell us distribution limits occur where ecological parameters coincide with the boundaries of ecological niches. Evolutionary perspectives, on the other hand, surmise distribution boundaries reflect a failure of niche evolution. Though small … Continue reading

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The why’s of sex

Sex isn’t quite what it seems – while superficially wasteful in an evolutionary sense (why inherit on only one half of your genes, when you can inherit all of them asexually, or why waste resources in mating when you don’t … Continue reading

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Are genetic drift and inbreeding the same thing?

Does it ever happen to you that the more you try to understand something, the more difficult to understand it turns out to be? Recently, I’ve had such a problem with two of the very basic microevolutionary phenomena – genetic … Continue reading

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A different perspective on genetic architecture

As an ecological geneticist, I’m constantly reminded how much we don’t understand about the genetic nature of adaptive variation. Sure, we have lots of examples of genes/pathways/regions that seem to be responsible for adaptation, but we don’t really know if … Continue reading

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The Carnivorous Rodents of Southeast Asia

Whoa, Wallace. There be carnivorous rats on those islands. Sixty-two species, to be exact, across the broader Indo-Australian Archipelago. Among them are small- and large-bodied rats, worm-eaters with elongated snouts (“vermivores”), and even amphibious forms (Fig. 1), and they are … Continue reading

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Genomics of Hybridization – Part II, Top three of 2015

Death Valley pupfishes (Cyprinodon) are among the most endangered vertebrates on earth, with small inbred populations, with heavy risks of extinction in extreme environments. Martin et al. (2016) in a recent publication quantify diversity and adaptability in a very small population … Continue reading

Posted in bioinformatics, conservation, genomics, methods, natural history, next generation sequencing, population genetics, R, software, speciation, STRUCTURE, theory | Tagged , , , , | Leave a comment