The old Amazon
Once Hidden by Forest, Carvings in Land Attest to Amazon’s Lost World: For some scholars of human history in Amazonia, the geoglyphs in the Brazilian state of Acre and other archaeological sites suggest that the forests of the western Amazon, previously considered uninhabitable for sophisticated societies partly because of the quality of their soils, may […]
Human behavior over the ages
Over at Scientific American Eric Michael Johnson has a very long post up, The Case of the Missing Polygamists. It is a re-post of something he already published at Psychology Today a few years ago. Though provisionally a review of Sex at Dawn, Johnson covers a lot of ground, and also has extensive quotations from […]
Out of the agricultural hearths
Dienekes has an important post up, The womb of nations: how West Eurasians came to be. He outlines a scenario where a rapid expansion of a farming population has overlain much of Western Eurasia, atop aboriginal substrata. A few years ago you’d have laughed at such a model, mostly due to the authority of archaeologists […]
Men on the move, part n
Ancient DNA suggests the leading role played by men in the Neolithic dissemination: The impact of the Neolithic dispersal on the western European populations is subject to continuing debate. To trace and date genetic lineages potentially brought during this transition and so understand the origin of the gene pool of current populations, we studied DNA […]
Unfrying the egg
Dienekes has a long post, the pith of which is expressed in the following: If I had to guess, I would propose that most extant Europeans will be discovered to be a 2-way West Asian/Ancestral European mix, just as most South Asians are a simple West Asian/Ancestral South Indian mix. In both cases, the indigenous component is […]
The last 100,000 years in human history
In light of the recent results in human evolutionary history some readers have appealed to me to create some sort of clearer infographic. There’s a lot to juggle in your head when it comes to the new models and the errors and uncertainties in estimates derived from statistical inference. Words are not always optimal, and […]
The words of the father
Over at A Replicated Typo they are talking about a short paper in Science, Mother Tongue and Y Chromosomes. In it Peter Forster and Colin Renfrew observe that “A correlation is emerging that suggests language change in an already-populated region may require a minimum proportion of immigrant males, as reflected in Y-chromosome DNA types.” But […]
A world full of children
The figure to the left is from a new paper in Science, When the World’s Population Took Off: The Springboard of the Neolithic Demographic Transition. It reports the findings from 133 cemeteries in the northern hemisphere in regards to the proportion …
The biocultural frog and tortoise
As many of you know when you have two adjacent demes, breeding populations, they often rapidly equilibrate in gene frequencies if they were originally distinct. There are plenty of good concrete examples of this. The Hui of China are Muslims who speak…
“What if you’re wrong” – haplogroup J
Back when this sort of thing was cutting edge mtDNA haplogroup J was a pretty big deal. This was the haplogroup often associated with the demic diffusion of Middle Eastern farmers into Europe. This was the “Jasmine” clade in Seven Daughters…
Grain, disease, and innovation
I just finished reading a review of the literature since 1984 on the bioarchaeology of the transition to agriculture. Stature and robusticity during the agricultural transition: Evidence from the bioarchaeological record:
The population explosion that …
Domestication as introgression and assimilation
The Pith: the spread of domestic rice may be a function not of the spread of rice per se, as much as a specific narrow set of genes which confer domestication to disparate rice lineages.
This has been a big month for rice. At least for me. Despite my b…
Why rice is so nice
The Pith: What makes rice nice in one varietal may not make it nice in another. Genetically that is….
Rice is edible and has high yields thanks to evolution. Specifically, the artificial selection processes which lead to domestication. The ̶…
Mediterranean men on the move
Seriously, sometimes history matches fiction a lot more than we’d have expected, or wished. In the early 2000s the Oxford geneticist Bryan Sykes observed a pattern of discordance between the spatial distribution of male mediated ancestry on the …
Europeans as Middle Eastern farmers
The Pith: Over the past 10,000 years a small coterie of farming populations expanded rapidly and replaced hunter-gatherer groups which were once dominant across the landscape. So, the vast majority of the ancestry of modern Europeans can be traced ba…
The day of the farmer
About five months ago I read Peter Bellwood’s First Farmers: The Origins of Agricultural Societies. Bellwood’s thesis is simple: that the first adopters of farming entered into a period of rapid demographic expansion and by and large replac…
The shadow of the Emishi
Randy McDonald just pointed me to a 2008 paper in AJHG, Japanese Population Structure, Based on SNP Genotypes from 7003 Individuals Compared to Other Ethnic Groups: Effects on Population-Based Association Studies. It speaks to an issue I brought up ear…
Swedes not so homogeneous?
Credit: David Shankbone
The more and more I see fine-scale genomic analyses of population structure across the world the more and more I believe that the “stylized” models which were in vogue in the early 2000s which explained how the worl…
Pandora’s Seed: The Unforeseen Cost of Civilization
Link to review: Pandora’s Seed: The Unforeseen Cost of Civilization