Angela
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Interesting paper, and interesting map...
See:Benjamin M. Peter et al (including Novembre)
[h=1]Genetic landscapes reveal how human genetic diversity aligns with geography[/h]https://www.biorxiv.org/content/biorxiv/early/2017/12/13/233486.full.pdf
"[FONT="]Summarizing spatial patterns in human genetic diversity to understand population history has been a persistent goal for human geneticists. Here, we use a recently developed spatially explicit method to estimate "effective migration" surfaces to visualize how human genetic diversity is geographically structured (the EEMS method). The resulting surfaces are "rugged", which indicates the relationship between genetic and geographic distance is heterogenous and distorted as a rule. Most prominently, topographic and marine features regularly align with increased genetic differentiation (e.g. the Sahara desert, Mediterranean Sea or Himalaya at large scales; the Adriatic, inter-island straits in near Oceania at smaller scales). We also see traces of historical migrations and boundaries of language families. These results provide visualizations of human genetic diversity that reveal local patterns of differentiation in detail and emphasize that while genetic similarity generally decays with geographic distance, there have regularly been factors that subtly distort the underlying relationship across space observed today. The fine-scale population structure depicted here is relevant to understanding complex processes of human population history and may provide insights for geographic patterning in rare variants and heritable disease risk."
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No doubt it's more detailed in areas where we have data. Lots of mini barriers in Europe, including Italy. Interesting why the barrier at the Caucasus mountains isn't so very significant, but part of the PC Steppe has a big barrier. Also, given how much more homogeneous Iberia is than Italy, I wonder why they have so many more mini-barriers. Have to read it more carefully.
Razib Khan has opined:
https://gnxp.nofe.me/2017/12/14/a-genetic-map-of-the-world/
See:Benjamin M. Peter et al (including Novembre)
[h=1]Genetic landscapes reveal how human genetic diversity aligns with geography[/h]https://www.biorxiv.org/content/biorxiv/early/2017/12/13/233486.full.pdf
"[FONT="]Summarizing spatial patterns in human genetic diversity to understand population history has been a persistent goal for human geneticists. Here, we use a recently developed spatially explicit method to estimate "effective migration" surfaces to visualize how human genetic diversity is geographically structured (the EEMS method). The resulting surfaces are "rugged", which indicates the relationship between genetic and geographic distance is heterogenous and distorted as a rule. Most prominently, topographic and marine features regularly align with increased genetic differentiation (e.g. the Sahara desert, Mediterranean Sea or Himalaya at large scales; the Adriatic, inter-island straits in near Oceania at smaller scales). We also see traces of historical migrations and boundaries of language families. These results provide visualizations of human genetic diversity that reveal local patterns of differentiation in detail and emphasize that while genetic similarity generally decays with geographic distance, there have regularly been factors that subtly distort the underlying relationship across space observed today. The fine-scale population structure depicted here is relevant to understanding complex processes of human population history and may provide insights for geographic patterning in rare variants and heritable disease risk."
[/FONT]
No doubt it's more detailed in areas where we have data. Lots of mini barriers in Europe, including Italy. Interesting why the barrier at the Caucasus mountains isn't so very significant, but part of the PC Steppe has a big barrier. Also, given how much more homogeneous Iberia is than Italy, I wonder why they have so many more mini-barriers. Have to read it more carefully.
Razib Khan has opined:
https://gnxp.nofe.me/2017/12/14/a-genetic-map-of-the-world/