If these bones could talk

By Razib Khan | October 19, 2013 1:34 pm
Credit: Thomas Roche

Credit: Thomas Roche

By now you have probably seen the articles about how a new skull has transformed our understanding of the human family tree. The original paper is at Science, A Complete Skull from Dmanisi, Georgia, and the Evolutionary Biology of Early Homo. More colorfully you might say that this publication burns down the “bushy” model of human origins, where you have a complex series of bifurcations and local regional diversity, and then rapid extinction with the rise of H. sapiens sapiens ~50,000 years ago. In general I’m more in agreement with those plant geneticists who are skeptical of excessive fixation on the concept of species, so this is not a shock to me. To me a species concept is not a thing, but an instrument to a thing (i.e., I’m in interested in population and phylogenetics). The reason these sorts of findings overturn the orthodoxy has more to do with human cognitive intuitions about why things are categorized, than the reality of how nature arranges itself.

I waited to say anything because I was rather sure John Hawks would comment on this at some point, and that point has come: The new skull from Dmanisi. As we coelacanth science bloggers like to say: read the whole thing. But I do have a small point to add: John’s model of descriptively episodic and punctuated expansions followed by long equilibria of regional localization tempered by gene flow may be characteristic of many medium to large Pleistocene mammals. To see where I’m coming from, please read Genome Sequencing Highlights Genes Under Selection and the Dynamic Early History of Dogs. Focus on the section in regards to the bottleneck of wolves.

CATEGORIZED UNDER: Evolution
MORE ABOUT: Evolution
  • Chad

    I’m getting an error from your links to John Hawks’ blog.

  • Dmitry Pruss

    If these bones could talk, I wish they would tell us where to find more. What stuns me the most about the whole Dmanisi series is the sheer strength of coincidence. How an unremarkable early medieval fortress would attract archaeologists, who would somehow recognize some of the unearthed objects as stone tools, seemingly unremarkable too but thousand times as old as the target of their dig, which would trigger a grant for a more thorough dig, which would reveal the hominid bones … how can we ever count on another strike of luck like this?

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This blog is about evolution, genetics, genomics and their interstices. Please beware that comments are aggressively moderated. Uncivil or churlish comments will likely get you banned immediately, so make any contribution count!

About Razib Khan

I have degrees in biology and biochemistry, a passion for genetics, history, and philosophy, and shrimp is my favorite food. In relation to nationality I'm a American Northwesterner, in politics I'm a reactionary, and as for religion I have none (I'm an atheist). If you want to know more, see the links at http://www.razib.com

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