Do Black Babies have Blue Eyes?

Short answer: No.

Some of my baby books make claims like, “Babies are born with blue or grey eyes, most of which gradually darken during their first year.” Some go so far as to claim that all babies are born with blue eyes.

This got me curious: what about Black / African American babies? Are they also born with blue/grey eyes which darken with time? Or were my books over-generalizing from a sample population composed primarily of whites?

The idea isn’t totally crazy. After all, I’ve observed plenty of Caucasian children’s eyes go from blue to brown. Pretty much all infants are born with less melanin than their parents, just because fetuses don’t need protection from sunlight.

After much wondering, I remembered that this is the Internet Age and that people post pictures of their babies online and I can just look up pictures of African Newborns and look at their eyes. Here’s a photo of a sweet Uganadan baby with brown eyes; if you scroll down, this article has a photo of a baby boy with black eyes; here’s an African American baby with brown eyes. (I’m just linking because I try not to steal people’s baby photos.)

To be fair, not all of these photos are necessarily of newborns, but could be somewhat older babies, but this is a process that is supposed to happen over the course of several months to a year, not days.

And while some of these infants do have a greyish or bluish tint to their eyes, the overall color is still brown, not blue.

I suppose I should look up photos of Asian babies while we’re at it.

*Googles*

And… they have brown eyes.

There you go, folks. Asian and African babies have brown eyes, not blue.

Let’s Talk Genetics (Polish and German)

source: Big Think: Genetic map of Europe

Continuing with our discussion of German/Polish history/languages/genetics, let’s look at what some actual geneticists have to say.

(If you’re joining us for the first time, the previous two posts summarize to: due to being next door to each other and having been invaded/settled over the millennia by groups which didn’t really care about modern political borders, Polish and German DNA are quite similar. More recent events, however, like Germany invading Poland and trying to kill all of the Poles and ethnic Germans subsequently fleeing/being expelled from Poland at the end of the war have created conditions necessary for genetic differentiation in the two populations.)

So I’ve been looking up whatever papers I can find on the subject.

In Contemporary paternal genetic landscape of Polish and German populations: from early medieval Slavic expansion to post-World War II resettlements, Rebala et al write:

The male genetic landscape of the European continent has been shown to be clinal and influenced primarily by geography rather than by language.1 One of the most outstanding phenomena in the Y-chromosomal diversity in Europe concerns the population of Poland, which reveals geographic homogeneity of Y-chromosomal lineages in spite of a relatively large geographic area seized by the Polish state.2 Moreover, a sharp genetic border has been identified between paternal lineages of neighbouring Poland and Germany, which strictly follows a political border between the two countries.3 Massive human resettlements during and shortly after the World War II (WWII), involving millions of Poles and Germans, have been proposed as an explanation for the observed phenomena.2, 3 Thus, it was possible that the local Polish populations formed after the early Slavic migrations displayed genetic heterogeneity before the war owing to genetic drift and/or gene flow with neighbouring populations. It has been also suggested that the revealed homogeneity of Polish paternal lineages existed already before the war owing to a common genetic substrate inherited from the ancestral Slavic population after the Slavs’ early medieval expansion in Europe.2 …

We used high-resolution typing of Y-chromosomal binary and microsatellite markers first to test for male genetic structure in the Polish population before massive human resettlements in the mid-20th century, and second to verify if the observed present-day genetic differentiation between the Polish and German paternal lineages is a direct consequence of the WWII or it has rather resulted from a genetic barrier between peoples with distinct linguistic backgrounds. The study further focuses on providing an answer to the origin of the expansion of the Slavic language in early medieval Europe. For the purpose of our investigation, we have sampled three pre-WWII Polish regional populations, three modern German populations (including the Slavic-speaking Sorbs) and a modern population of Slovakia. …

AMOVA in the studied populations revealed statistically significant support for two linguistically defined groups of populations in both haplogroup and haplotype distributions (Table 2). It also detected statistically significant genetic differentiation for both haplogroups and haplotypes in three Polish pre-WWII regional populations (Table 2). The AMOVA revealed small but statistically significant genetic differentiation between the Polish pre-war and modern populations (Table 2). When both groups of populations were tested for genetic structure separately, only the modern Polish regional samples showed genetic homogeneity (Table 2). Regional differentiation of 10-STR haplotypes in the pre-WWII populations was retained even if the most linguistically distinct Kashubian speakers were excluded from the analysis (RST=0.00899, P=0.01505; data not shown). Comparison of Y chromosomes associated with etymologically Slavic and German surnames (with frequencies provided in Table 1) did not reveal genetic differentiation within any of the three Polish regional populations for all three (FST, ΦST and RST) genetic distances. Moreover, the German surname-related Y chromosomes were comparably distant from Bavaria and Mecklenburg as the ones associated with the Slavic surnames (Supplementary Figure S2). MDS of pairwise genetic distances showed a clear-cut differentiation between German and Slavic samples (Figure 2). In addition, the MDS analysis revealed the pre-WWII populations from northern, central and southern Poland to be moderately scattered in the plot, on the contrary to modern Polish regional samples, which formed a very tight, homogeneous cluster (Figure 3).

Nicolaus Copernicus, Polish astronomer famous for developing heliocentric model of the solar system

This all seems very reasonable. Modern Poland is probably more homogenous than pre-war Poland in part because modern Poles have cars and trains and can marry people from other parts of Poland much more easily than pre-war Poles could, and possibly because the war itself reduced Polish genetic diversity and displaced much of the population.

Genetic discontinuity along the Polish-German border also makes sense, as national, cultural, and linguistic boundaries all make intermarriage more difficult.

The Discussion portion of this paper is very interesting; I shall quote briefly:

Kayser et al3 revealed significant genetic differentiation between paternal lineages of neighbouring Poland and Germany, which follows a present-day political border and was attributed to massive population movements during and shortly after the WWII. … it remained unknown whether Y-chromosomal diversity in ethnically/linguistically defined Slavic and German populations, which used to be exposed to intensive interethnic contacts and cohabit ethnically mixed territories, was clinal or discontinuous already before the war. In contrast to the regions of Kaszuby and Kociewie, which were politically subordinated to German states for more than three centuries and before the massive human resettlements in the mid-20th century occupied a narrow strip of land between German-speaking territories, the Kurpie region practically never experienced longer periods of German political influence and direct neighbourhood with the German populations. Lusatia was conquered by Germans in the 10th century and since then was a part of German states for most of its history; the modern Lusatians (Sorbs) inhabit a Slavic-speaking island in southeastern Germany. In spite of the fact that these four regions differed significantly in exposure to gene flow with the German population, our results revealed their similar genetic differentiation from Bavaria and Mecklenburg. Moreover, admixture estimates showed hardly detectable German paternal ancestry in Slavs neighbouring German populations for centuries, that is, the Sorbs and Kashubes. However, it should be noted that our regional population samples comprised only individuals of Polish and Sorbian ethnicity and did not involve a pre-WWII German minority of Kaszuby and Kociewie, which owing to forced resettlements in the mid-20th century ceased to exist, and also did not involve Germans constituting since the 19th century a majority ethnic group of Lusatia. Thus, our results concern ethnically/linguistically rather than geographically defined populations and clearly contrast the broad-scale pattern of Y-chromosomal diversity in Europe, which was shown to be strongly driven by geographic proximity rather than by language.1 …

Two main factors are believed to be responsible for the Slavic language extinction in vast territories to the east of the Elbe and Saale rivers: colonisation of the region by the German-speaking settlers, known in historical sources as Ostsiedlung, and assimilation of the local Slavic populations, but contribution of both factors to the formation of a modern eastern German population used to remain highly speculative.8 Previous studies on Y-chromosomal diversity in Germany by Roewer et al17 and Kayser et al3 revealed east–west regional differentiation within the country with eastern German populations clustering between western German and Slavic populations but clearly separated from the latter, which suggested only minor Slavic paternal contribution to the modern eastern Germans. Our ancestry estimates for the Mecklenburg region (Supplementary Table S3) and for the pooled eastern German populations, assessed as being well below 50%, definitely confirm the German colonisation with replacement of autochthonous populations as the main reason for extinction of local Slavic vernaculars. The presented results suggest that early medieval Slavic westward migrations and late medieval and subsequent German eastward migrations, which outnumbered and largely replaced previous populations, as well as very limited male genetic admixture to the neighbouring Slavs (Supplementary Table S4), were likely responsible for the pre-WWII genetic differentiation between Slavic- and German-speaking populations. Woźniak et al18 compared several Slavic populations and did not detect such a sharp genetic boundary in case of Czech and Slovak males with genetically intermediate position between other Slavic and German populations, which was explained by early medieval interactions between Slavic and Germanic tribes on the southern side of the Carpathians. Anyway, paternal lineages from our Slovak population sample were genetically much closer to their Slavic than German counterparts. …

Note that they are discussing paternal ancestry. This does not rule out the possibility of significant Slavic maternal ancestry. Finally:

Our coalescence-based divergence time estimates for the two isolated western Slavic populations almost perfectly match historical and archaeological data on the Slavs’ expansion in Europe in the 5th–6th centuries.4 Several hundred years of demographic expansion before the divergence, as detected by the BATWING, support hypothesis that the early medieval Slavic expansion in Europe was a demographic event rather than solely a linguistic spread of the Slavic language.

Marian Rejewski, Polish mathematician and cryptologist who reconstructed the Nazi German military Enigma cipher machine sight-unseen in 1932

I left out a lot of interesting material, so I recommend reading the complete discussion if you want to know more about Polish/German genetics.

But what about the maternal contribution? Luckily for us, Malyarchuk et al have written Mitochondrial DNA analysis in Poles and Russians:

Mitochondrial DNA (mtDNA) sequence variation was examined in Poles (from the Pomerania-Kujawy region; n = 436) and Russians (from three different regions of the European part of Russia; n = 201)… The classification of mitochondrial haplotypes revealed the presence of all major European haplogroups, which were characterized by similar patterns of distribution in Poles and Russians. An analysis of the distribution of the control region haplotypes did not reveal any specific combinations of unique mtDNA haplotypes and their subclusters that clearly distinguish both Poles and Russians from the neighbouring European populations. The only exception is a novel subcluster U4a within subhaplogroup U4, defined by a diagnostic mutation at nucleotide position 310 in HVS II. This subcluster was found in common predominantly between Poles and Russians (at a frequency of 2.3% and 2.0%, respectively) and may therefore have a central-eastern European origin. …

The analysis of mtDNA haplotype distribution has shown that both Slavonic populations share them mainly with Germans and Finns. The following numbers of the rare shared haplotypes and subclusters were found between populations analyzed: 10% between Poles and Germans, 7.4% between Poles and Russians, and 4.5% between Russians and Germans. A novel subcluster U4-310, defined by mutation at nucleotide position 310 in HVS II, was found predominantly in common between Poles and Russians (at frequency of 2%). Given the relatively high frequency and diversity of this marker among Poles and its low frequency in the neighbouring German and Finnish populations, we suggest a central European origin of U4-310, following by subsequent dispersal of this mtDNA subgroup in eastern European populations during the Slavonic migrations in early Middle Ages.

In other words, for the most part, Poles, Russians, Germans, and even Finns(!) (who do not speak an Indo-European language and are usually genetic outliers in Europe,) all share their maternal DNA.

Migrants, immigrants, and invaders tend disproportionately to be male (just look at any army) while women tend to stay behind. Invading armies might wipe each other out, but the women of a region are typically spared, seen as booty similar to cattle to be distributed among the invaders rather than killed. Female populations therefore tend to be sticky, in a genetic sense, persisting long after all of the men in an area were killed and replaced. The dominant Y-chromosome haplogroup in the area (R1a) hails from the Indo-European invasion (except in Finland, obviously,) but the mtDNA likely predates that expansion.

These data allow us to suggest that Europeans, despite their linguistic differences, originated in the common genetic substratum which predates the formation of the most modern European populations. It seems that considerable genetic similarity between European populations, which has been revealed by mtDNA variation studies, was further accelerated by a process of gene redistribution between populations due to the multiple migrations occurring in Europe during the past milenia…

It is interesting, though, that recent German invasions of Poland left very little in the way of a genetic contribution. I’d wager that WWII was quite a genetic disaster for everyone involved.

If you want more information, Khazaria has a nice list of studies plus short summaries on Polish DNA.

On Germanic and Polish DNA

Distribution of Y-chromosomal haplogroup I1a in Europe.

Commentator Unknown123 asks what we can tell about the differences between German and Polish DNA. Obviously German is here referring to one of the Germanic peoples who occupy the modern nation of Germany and speak a Germanic language. But as noted before, just because people speak a common language doesn’t necessarily mean they have a common genetic origin. Germans and English both speak Germanic languages , but Germans could easily share more DNA with their Slavic-language speaking neighbors in Poland than with the English.

According to Wikipedia, the modern Germanic peoples include Afrikaners, Austrians, Danes, Dutch, English, Flemish, Frisians, Germans, Icelanders, Lowland Scots, Norwegians, and Swedes.[225][226]

And here is a map that is very suggestive of Viking raiders:

(It’s also not a bad map of the distribution of Germanic peoples in 750 BC.)

Wikipedia states:

It is suggested by geneticists that the movements of Germanic peoples has had a strong influence upon the modern distribution of the male lineage represented by the Y-DNA haplogroup I1, which is believed to have originated with one man, who lived approximately 4,000 to 6,000 years somewhere in Northern Europe, possibly modern Denmark … There is evidence of this man’s descendants settling in all of the areas that Germanic tribes are recorded as having subsequently invaded or migrated to.[220][v] However, it is quite possible that Haplogroup I1 is pre-Germanic, that is I1 may have originated with individuals who adopted the proto-Germanic culture, at an early stage of its development or were co-founders of that culture. Should that earliest Proto-Germanic speaking ancestor be found, his Y-DNA would most likely be an admixture of the aforementioned I1, but would also contain R1a1a, R1b-P312 and R1b-U106, a genetic combination of the haplogroups found among current Germanic speaking peoples.[221] …

Haplogroup I1 accounts for approximately 40% of Icelandic males, 40%–50% of Swedish males, 40% of Norwegian males, and 40% of Danish Human Y-chromosome DNA haplogroups. Haplogroup I1 peaks in certain areas of Northern Germany and Eastern England at more than 30%. Haplogroup R1b and haplogroup R1a collectively account for more than 40% of males in Sweden; over 50% in Norway, 60% in Iceland, 60–70% in Germany, and between 50%–70% of the males in England and the Netherlands depending on region.[222]

Note, though, that this map has some amusing results; clearly it’s a more Nordic distribution than specifically German, with “Celtic” Ireland just as Nordic as much of England and Germany.

Wikipedia also states:

According to a study published in 2010, I-M253 originated between 3,170 and 5,000 years ago, in Chalcolithic Europe.[1] A new study in 2015 estimated the origin as between 3,470 and 5,070 years ago or between 3,180 and 3,760 years ago, using two different techniques.[2] It is suggested that it initially dispersed from the area that is now Denmark.[8]

A 2014 study in Hungary uncovered remains of nine individuals from the Linear Pottery culture, one of whom was found to have carried the M253 SNP which defines Haplogroup I1. This culture is thought to have been present between 6,500 and 7,500 years ago.[12]

Further:

In 2002 a paper was published by Michael E. Weale and colleagues showing genetic evidence for population differences between the English and Welsh populations, including a markedly higher level of Y-DNA haplogroup I in England than in Wales. They saw this as convincing evidence of Anglo-Saxon mass invasion of eastern Great Britain from northern Germany and Denmark during the Migration Period.[13] The authors assumed that populations with large proportions of haplogroup I originated from northern Germany or southern Scandinavia, particularly Denmark, and that their ancestors had migrated across the North Sea with Anglo-Saxon migrations and DanishVikings. The main claim by the researchers was:

“That an Anglo-Saxon immigration event affecting 50–100% of the Central English male gene pool at that time is required. We note, however, that our data do not allow us to distinguish an event that simply added to the indigenous Central English male gene pool from one where indigenous males were displaced elsewhere or one where indigenous males were reduced in number … This study shows that the Welsh border was more of a genetic barrier to Anglo-Saxon Y chromosome gene flow than the North Sea … These results indicate that a political boundary can be more important than a geophysical one in population genetic structuring.”

In 2003 a paper was published by Christian Capelli and colleagues which supported, but modified, the conclusions of Weale and colleagues.[14] This paper, which sampled Great Britain and Ireland on a grid, found a smaller difference between Welsh and English samples, with a gradual decrease in Haplogroup I frequency moving westwards in southern Great Britain. The results suggested to the authors that Norwegian Vikings invaders had heavily influenced the northern area of the British Isles, but that both English and mainland Scottish samples all have German/Danish influence.

But the original question was about Germany and Poland, not England and Wales, so we are wandering a bit off-track.

source: Big Think: Genetic map of EuropeLuckily for me, Wikipedia helpfully has a table of European Population Genetic Substructure based on SNPs[48][59]. We’ll be extracting the most useful parts.

A score of “1” on this graph means that the two populations in question are identical–fully inter-mixing. The closer to 1 two groups score, the more similar they are. The further from one they score, (the bigger the number,) the more different they are.

Why isn't it in English? Oh, well. We'll manage.
Here is a potentially relevant map of the neolithic cultures of Europe

For example, the most closely related peoples on the graph are Austrians and their neighbors in southern Germany and Hungary (despite Hungarians speaking a non-Indo-European language brought in by recent steppe invaders.) Both groups scored 1.04 relative to Austrians, and a 1.08 relative to each other.

Northern and southern Germans also received a 1.08–so southern Germans are about as closely related to northern Germans as they are to Hungarians, and are more closely related to Austrians than to northern Germans.

This might reflect the pre-Roman empire population in which (as we discussed in the previous post) the Celtic cultures of Hallstatt and La Tene dominated a stretch of central Europe between Austria and Switzerland, with significant expansion both east and west, whilst the proto-Germanic peoples occupied northern Germany and later spread southward.

The least closely related peoples on the graph are (unsurprisingly) the Sami (Lapp) town of Kuusamo in northeastern Finland and Spain, at 4.21. (Finns are always kind of outliers in Europe, and Spaniards are kind of outliers in their own, different way, being the part of mainland Europe furthest from the Indo-European expansion starting point and so having received fewer invaders.

So what does the table say about Germans and their neighbors?

source: Big Think: Genetic map of Europe

Northern Germany:
South Germany 1.08
Austria 1.10
Hungary 1.11
Sweden 1.12
Czech Repub 1.15
Poland 1.18
France 1.25
Bulgaria 1.32
Switzerland 1.36

Southern Germany:
Austria 1.04
North Germany 1.08
Hungary 1.08
France 1.12
Czech Repub 1.16
Switzerland 1.17
Bulgaria 1.19
Latvia 1.20
Sweden 1.21
Poland 1.23

 

Poland:
Czech Repub 1.09
Hungary: 1.14
Estonia 1.17
North Germany 1.18
Russia 1.18
Austria 1.19
Lithuania 1.20
South Germany 1.23
Latvia: 1.26
Bulgaria 1.29
Sweden 1.30
Switzerland 1.46

Obviously I didn’t include all of the data in the original table; all of the other sampled European groups, such as Italians, Spaniards, and Finns are genetically further away from north and south Germany and Poland than the listed groups.

So northern Germany and Poland are quite closely related–even closer than northern Germans are to the French (whose country is named after a Germanic tribe, the Franks, who conquered it during the Barbarian Migrations at the Fall of the Roman Empire,) or the Swiss, many of whom speak German. By contrast, southern Germany is more closely related to France and Switzerland than to Poland, but still more closely related to the Poles than Italians or Spaniards.

To be continued…

Rafflesia: the Parasitic Flowers of Breath of the Wild

Let’s consider the similarities between the fairy fountains found in Nintendo’s new Legend of Zelda installment, Breath of the Wild, and the enormous blooms of our terrestrial Rafflesia genus.

Rafflesia Arnoldii hold the record for world’s largest flowers, growing regularly to a width of 3 feet and weighing up to 24 pounds. Their central chamber is large enough to put a baby in, if you aren’t too perturbed by their odd spiky structures and horrific smell.

The Fairy Fountain is obviously the largest flower in Breath of the Wild and has a central chamber similar to Rafflesia’s; an enormous fairy woman lives inside.

Rafflesia is a parasitic plant which actually has no stems, leaves, roots, or even chlorophyll! (This has made tracing its genetic relationships to other plants difficult for scientists, because most of what we know about plant relationships is based off comparing differences in their chlorophyll’s DNA.) The only visible parts of the plant are its buds and, subsequently, the flowers they open into.

Likewise, the Fairy Fountain has no leaves, stems, or other visible plant parts–it is just a bud that opens into a flower. (However, the fairy fountain bud is green. Perhaps it would have looked too much like a giant nut if it were brown like the true Rafflesia.)

The rest of Rafflesia’s structure is hidden within the vines it parasitizes. When not in bloom, it’s just a network within the vine, just as a mushroom’s principle structures lie hidden within the ground or rotting logs.

The Fairy Fountain is surrounded by mushrooms, which suggest their similarity to the fountain’s hidden structure.

Rafflesia’s enormous size is due to the fact that it is pollinated by carrion flies, who are attracted to the largest carcasses they can find. Unfortunately, this also means that Rafflesia smells like rotting meat, earning it various unsavory names like “corpse flower.” It also possesses the remarkable ability to generate heat, creating a warm, comfortable environment for flies to congregate in.

In Breath of the Wild, the Fairy Fountain is also home to flies, though these are thankfully the much less smelly, tiny winged fairy kind.

What about pollen? According to Harvard Magazine:

“The pollen is incredible,” Davis continues. In most plants, the pollen is powdery, but in Rafflesia, it is “produced as a massive quantity of viscous fluid, sort of like snot, that dries on the backs of these flies—and presumably remains viable for quite a long time,” perhaps weeks. In their pollinating efforts, the flies may travel as much as 12 to 14 miles.

I don’t have a very good sense of scale in Breath of the Wild, but 12 or 14 miles between Fairy Fountains sounds about right. By picking up fairies at one fountain and carrying them to the next, Link is helping this likely endangered Hylian species reproduce.

Likewise, the center of the enormous Fairy Fountains is filled not with powder, but some kind of… liquid.

Flower snot.

Or it might just be water:

Vines move massive quantities of water, which may be one of the physiological reasons that Rafflesia colonize them, he explains. The flowers, which to the touch are like “a Nerf football that is wet,” are mostly water themselves, and the exponential growth of the blooms in the final stages of development is made possible “primarily by pumping massive quantities of water into the flower.”

That’s a lot like what I imagine the Fairy Fountain would feel like, too.

But the really interesting thing about Rafflesia is their genes:

Given his mandate to establish a phylogeny for the order Malpighiales, Davis set out, dutifully, to duplicate the published result for Rafflesia. What he found was not just unexpected. It absolutely astounded him. Some of the genes he sequenced confirmed that Rafflesia were indeed part of Malpighiales—but other sequenced genes placed them in an entirely different order (Vitales)—with their host plants. Davis had stumbled upon a case of massive horizontal gene transfer, the exchange of genetic information between two organisms without sex. …

The work is also facilitating the identification of Rafflesia’s past hosts, since many of the transgenes Davis found came from lineages of plants other than Tetrastigma, the current host. These ancient parasite/host associations, a kind of molecular fossil record, could be used to elucidate the timing and origin of plant parasitism itself.

Davis found that the host plant contributed about 2 percent to 3 percent of Rafflesia’s expressed nuclear genome (genes in the cell nucleus), and as much as 50 percent of its mitochondrial genome (genes that govern energy production). The sheer scale of the transfer was so far-fetched, his collaborator at the time at first didn’t believe that the findings could be accurate. The paper, published in 2012, demonstrated that intimate host/parasite connections are potentially an important means by which horizontal gene transfers can occur. And it showed that the physiological invisibility of Rafflesia within the host is echoed in its genes: the host and parasite share so much biology that the boundaries between them have become blurred.

Intriguingly, some of the transferred genes swap in at precisely the same genetic location as in the parasite’s own genome. “One of the ideas that we are exploring,” says Davis, “is whether maintaining these transferred genes might provide a fitness advantage for the parasite. Might these transfers be providing a kind of genetic camouflage so that the host can’t mount an immune response to the parasite that lives within it?”

And finally, Rafflesia flowers and the Fairy Fountain are basically the same color: both are both reddish with white mottling.

What Mental Traits does the Arctic Select for?

Apropos Friday’s conversation about the transition from hunting to pastoralism and the different strategies hunters employ in different environments, I got to thinking about how these different food-production systems could influence the development of different “intelligences,” or at least mental processes that underlie intelligence.

Ingold explains that in warm climes, hunter-gatherers have many food resources they can exploit, and if one resource starts running low, they can fairly easily switch to another. If there aren’t enough yams around, you can eat melons; if not enough melons, squirrels; if no squirrels, eggs. I recall a study of Australian Aborigines who agreed to go back to hunter-gatherering for a while after living in town for several decades. Among other things (like increased health,) scientists noted that the Aborigines increased the number of different kinds of foods they consumed from, IIRC, about 40 per week to 100.

By contrast, hunters in the arctic are highly dependent on exploiting only a few resources–fish, seals, reindeer, and perhaps a few polar bears and foxes. Ingold claims that there are (were) tribes that depended largely on only a few major hunts of migrating animals (netting hundreds of kills) to supply themselves for the whole year.

If those migrating change their course by even a few miles, it’s easy to see how the hunters could miss the herds entirely and, with no other major species around to exploit, starve over the winter.

Let’s consider temperate agriculture as well: the agriculturalist can store food better than the arctic hunter (seal meat does not do good things in the summer,) but lacks the tropical hunter-gatherer’s flexibility; he must stick to his fields and keep working, day in and day out, for a good nine months in a row. Agricultural work is more flexible than assembly line work, where your every minute is dictated by the needs of the factory, but a farmer can’t just wander away from his crops to go hunt for a months just because he feels like it, nor can he hope to make up for a bad wheat harvest by wandering into his neighbor’s fields and picking their potatoes.

Which got me thinking: clearly different people are going to do better at different systems.

But first, what is intelligence? Obviously we could define it in a variety of ways, but let’s stick to reasonable definitions, eg, the ability to use your brain to achieve success, or the ability to get good grades on your report card.

A variety of mental traits contribute to “intelligence,” such as:

  1. The ability to learn lots of information. Information is really useful, both in life and on tests, and smarter brains tend to be better at storing lots and lots of data.
  2. Flexible thinking. This is the ability to draw connections between different things you’ve learned, to be creative, to think up new ideas, etc.
  3. Some form of Drive, Self Will, or long-term planning–that is, the ability to plan for your future and then push yourself to accomplish your goals. (These might more properly be two different traits, but we’ll keep them together for now.)

Your stereotypical autistic, capable of memorizing large quantities of data but not doing much with them, has trait #1 but not 2 or 3.

Artists and musicians tend to have a lot of trait #2, but not necessarily 1 or 3 (though successful artists obviously have a ton of #3)

And an average kid who’s not that bright but works really hard, puts in extra hours of effort on their homework, does extra credit assignments, etc., has a surfeit of #3 but not much 2 or 1.

Anyway, it seems to me like the tropical hunting/gathering environment, with many different species to exploit, would select for flexible thinking–if one food isn’t working out, look for a different one. This may also apply to people from tropical farming/horticulturalist societies.

By contrast, temperate farming seems more likely to select for planning–you can’t just wander off or try to grow something new in time for winter if your first crop doesn’t work out.

Many people have noted that America’s traditionally tropical population (African Americans) seems to be particularly good at flexible thinking, leading to much innovation in arts and music. They are not as talented, though, at Drive, leading to particularly high highschool dropout rates.

America’s traditionally rice-farming population (Asians,) by contrast, has been noted for over a century for its particularly high drive and ability to plan for the future, but not so much for contributions to the arts. East Asian people are noted for their particularly high IQ/SAT/PISA scores, despite the fact that China lags behind the West in GDP and quality of life terms. (Japan, of course, is a fully developed country.) One potential explanation for this is that the Chinese, while very good at working extremely hard, aren’t as good at flexible thinking that would help spur innovation. (I note that the Japanese seem to do just fine at flexible thinking, but you know, the Japanese aren’t Chinese and Japan isn’t China.)

(I know I’m not really stating anything novel.) But the real question is:

What kind of mental traits might pastoralism, arctic pastoralism, or arctic hunting select for?

Do Chilblains Affect Blacks More than Whites?

toes afflicted with chilblains
toes afflicted with chilblains

While tromping through a blizzard, seeking insight into circum-polar peoples, I discovered a condition called chilblains. The relevant Wikipedia page is rather short:

Chilblains … is a medical condition that occurs when a predisposed individual is exposed to cold and humidity, causing tissue damage. It is often confused with frostbite and trench foot. Damage to capillary beds in the skin causes redness, itching, inflammation, and sometimes blisters. Chilblains can be reduced by keeping the feet and hands warm in cold weather, and avoiding extreme temperature changes. Chilblains can be idiopathic (spontaneous and unrelated to another disease), but may also be a manifestation of another serious medical condition that needs to be investigated.

The part they don’t mention is that it can really hurt.

The first HBD-related question I became interested in–after visiting a black friend’s house and observing that she was comfortable without the AC on, even though it was summer–is whether people from different latitudes prefer different temperatures. It seems pretty obvious: surely people from Yakutsk prefer different temperatures than people from Pakistan. It also seems easy to test: just put people in a room and give them complete control over the thermostat. And yet, I’d never heard anyone discuss the idea.

Anyway, the perfunctory Wikipedia page on chilblains mentioned nothing about racial or ethnic predisposition to the condition–even though surely the Eskimo (Inuit) who have genetic admixture from both ice-age Neanderthals and Denisovans:

“Using this method, they found two regions with a strong signal of selection: (i) one region contains the cluster of FADS genes, involved in the metabolism of unsaturated fatty acids; (ii) the other region contains WARS2 and TBX15, located on chromosome 1.” …

“TBX15 plays a role in the differentiation of brown and brite adipocytes. Brown and brite adipocytes produce heat via lipid oxidation when stimulated by cold temperatures, making TBX15 a strong candidate gene for adaptation to life in the Arctic.” …

“The Inuit DNA sequence in this region matches very well with the Denisovan genome, and it is highly differentiated from other present-day human sequences, though we can’t discard the possibility that the variant was introduced from another archaic group whose genomes we haven’t sampled yet,” Dr. Racimo said.

The scientists found that the variant is present at low-to-intermediate frequencies throughout Eurasia, and at especially high frequencies in the Inuits and Native American populations, but almost absent in Africa.

Sub-Saharan Africans have their own archaic admixture, but they have very little to no ice-age hominin–which is probably good for them, except for those who’ve moved further north.

Imagine my surprised upon searching and discovering very little research on whether chilblains disproportionately affects people of different races or ethnicities. If you were a dermatologist–or a genetically prone person–wouldn’t you want to know?

So here’s what I did find:

The National Athletic Trainers Association Position Statement on Cold Injuries notes:

Black individuals have been shown to be 2 to 4 times more likely than individuals from other racial groups to sustain cold injuries. These differences may be due to cold weather experience, but are likely due to anthropometric and body composition differences, including less-pronounced CIVD, increased sympathetic response to cold exposure, and thinner, longer digits.3,6

I think CIVD=Cold-Induced Vasodilation

The Military Surgeon: Journal of the Association of Military Surgeons of the United States, Volumes 36-37, states:

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c2ijvyvveaaehdz c2ijw49vqaajuou

The text continues with descriptions of amputating rotting feet.

A PDF from the UK, titled “Cold Injury,” notes:

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Notice that the incidence of chilblains is actually less in extremely cold places than moderately cold places–attributed here to people in these places being well-equipped for the cold.

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Finally I found a PDF of a study performed, I believe, by the US Military, Epidemiology of US Army Cold Weather Injuries, 1980-1999:

picture-2

While I would really prefer to have more ethnic groups included in the study, two will have to suffice. It looks like trench foot may be an equal-opportunity offender, but chilblains, frostbite, and other cold-related injuries attack black men (at least in the army) at about 4x the rate of white men, and black women 2x as often as white women (but women in the army may not endure the same conditions as men in the army.)

On a related note, while researching this post, I came across this historic reference to infectious scurvy and diabetes, in the Journal of Tropical Medicine and Hygiene, Volumes 4-5 (published in 1902):

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Note: this is why it is important to discard bad theories after they’ve been disproven. Otherwise, you kill your scurvy victims by quarantining them instead of giving them oranges.

Wed Open Thread: 770,000 genomes and the American Nations

Wow, is it Wednesday already? Time definitely flies when you’re busy.

In interesting news, Politico ran an article with a long (and somewhat misleading) section about Moldbug, and further alleging (based on unnamed “sources” who are probably GodfreyElfwick again*,) that Moldbug is in communication with the Trump Administration:

In one January 2008 post, titled “How I stopped believing in democracy,” he decries the “Georgetownist worldview” of elites like the late diplomat George Kennan. Moldbug’s writings, coming amid the failure of the U.S. state-building project in Iraq, are hard to parse clearly and are open to multiple interpretations, but the author seems aware that his views are provocative. “It’s been a while since I posted anything really controversial and offensive here,” he begins in a July 25, 2007, post explaining why he associates democracy with “war, tyranny, destruction and poverty.”

Moldbug, who does not do interviews and could not be reached for this story, has reportedly opened up a line to the White House, communicating with Bannon and his aides through an intermediary, according to a source. Yarvin said he has never spoken with Bannon.

Vox does a much longer hit piece on Moldbug, just to make sure you understand that they really, truly don’t approve of him, then provides more detail on Moldbug’s denial:

The idea that I’m “communicating” with Steve Bannon through an “intermediary” is preposterous. I have never met Steve Bannon or communicated with him, directly or indirectly. You might as well accuse the Obama administration of being run by a schizophrenic homeless person in Dupont Circle, because he tapes his mimeographed screeds to light poles where Valerie Jarrett can read them.

*In all fairness, there was a comment over on Jim’s Blog to the effect that there is some orthosphere-aligned person in contact with the Trump administration, which may have set off a chain of speculation that ended with someone claiming they had totally legit sources saying Moldbug was in contact with Bannon.

In other news, Han et al have released Clustering of 770,000 genomes reveals post-colonial population structure of North America:

Here we identify very recent fine-scale population structure in North America from a network of over 500 million genetic (identity-by-descent, IBD) connections among 770,000 genotyped individuals of US origin. We detect densely connected clusters within the network and annotate these clusters using a database of over 20 million genealogical records. Recent population patterns captured by IBD clustering include immigrants such as Scandinavians and French Canadians; groups with continental admixture such as Puerto Ricans; settlers such as the Amish and Appalachians who experienced geographic or cultural isolation; and broad historical trends, including reduced north-south gene flow. Our results yield a detailed historical portrait of North America after European settlement and support substantial genetic heterogeneity in the United States beyond that uncovered by previous studies.

Wow! (I am tempted to add “just wow.”) They have created a couple of amazing maps:

ncomms14238-f3

Comment of the Week goes to Tim Smithers for his contributions on IQ in Are the Pygmies Retarded:

IQ generally measures the ability to learn, retain information, and make logical decisions and conclusions. It is not about mathematics nor reading, at least in modern testing (since about 1980).
Modern IQ tests typically do not have any math or even reading. Many have no verbiage at all, and there is no knowledge of math required in the least.
For example, a non-verbal, non-math IQ test may have a question that shows arrows pointing in different directions. The test taker must identify which direction would make the most sense for the next arrow to go.
I’m very sorry to disappoint, but I’ve done considerable research into IQ testing over the past decade. The tests have had cultural biases removed (including the assumption that one can read) in order to assess a persons ability to learn, to retain information, and to use common logic. …

You may, of course, RTWT there.

So, how’s it going out there?

 

Race: The Social Construction of Biological Reality

Note: This post contains a lot of oversimplification for the sake of explaining a few things. (Yes, I am still meditating on the greater Asian clade.)

Imagine you’re driving down a long highway that stretches from Nigeria to Beijing, passing through Berlin and New Delhi. In reality this route takes some large twists and turns, but we’re drawing it as a straight line, for all maps must simplify to be useful.

As you drive along, you pass many houses along the way–sometimes just a few clustered next to the highway, sometimes small towns, sometimes megalopolises with billions of people.

race

Queen Anna Nzinga of Ndongo and Matatmba
Queen Anna Nzinga of Ndongo and Matatmba

Our drive begins in one such megalopolis, that of Sub-Saharan Africa (SSA.) Here we meet people like Queen Anna Nzinga, author Chinua Achebe, and–though they have traveled far abroad–African Americans like Oprah Winfrey and Martin Luther King.

Though thousands of different languages are spoken by the thousands of different groups throughout SSA, we may still note a certain physical similarity among them–dark skin perfectly adapted to the equator’s strong sun, dark eyes, and tightly curling hair. While there is a tremendous amount of variety here–probably the most of any megalopolis in the world–they are also, quite clearly, related. You don’t have to go measuring skulls to figure that out.

But as we drive north, the houses thin out. Suddenly we are in a zone with almost no people–an enormous desert: the Sahara.

We speed through this harsh, empty landscape on a starry night, spotting only a few camels in the distance. We’re lucky we have a full tank of gas and several more in the trunk–for all but the most intrepid of our pre-automobile ancestors, this desert was nigh impassible, a vast barrier to human movement.

King Tutankhamun receives flowers from Ankhesenpaaten as a sign of love.
King Tut receives flowers from Ankhesenpaaten as a sign of love.

Finally we reach the vast inland sea of the Mediterranean, and the beginning of our second megalopolis. Most of the people here, from Berbers to Egyptians, have their own distinct look, more similar to their neighbors from the Middle East and Southern Europe than their neighbors to the south, across the inhospitable expanse of sand.

While there are many different countries and languages, no clear phenotypic line separates the people of Northern Africa, the Middle East, southern Europe, or northern Europe. Skin pales, hair lightens and becomes wavy, eyes turn a variety of hues as one nationality melts into the next. North-central Europe is the only place in the world where blue/green/hazel eyes and blond hair are common in adults; even in Wales, dark hair is dominant.

US Defense Secretary William S. Cohen with Prime Minister Nawaz Sharif (1998)
US Defense Secretary William S. Cohen (Jewish surname) with Pakistan’s Prime Minister Nawaz Sharif (Punjabi,) 1998

We hang a right through Turkey, Iran, Pakistan, and India, teeming with people.  Here again, though the people change and there are barriers like the Thar Desert, we find no harsh, nigh-impenetarable breaks like the Sahara.

Then, suddenly, we run smack into a wall, a natural wall of majestic proportions: the Himalayas. Beyond lie the Tibetan Plateau, Gobi Desert, and the vast emptiness of the Asian steppe. If this land was ever densely populated, generations of marauding steppe warriors have wiped them out. We see a few people here–aptly named Tibetan lamas, flocks of sheep grazing beside a scattering of yurts. Mongolia holds the distinction of being the world’s least densely populated independent country. (Ice-covered Greenland is even less dense, but owned by Denmark.)

Finally we pass beyond the shadow of the Great Khan’s memorial and into the valley of the Yellow River, where we find our third megalopolis: east Asia.

There is notably less genetic diversity here than in the first megalopolis–indeed, 93% of Han Chinese share a particular variety of the EDAR allele:

A derived G-allele point mutation (SNP) with pleiotropic effects in EDAR, 370A or rs3827760, found in most modern East Asians and Native Americans but not common in African or European populations, is thought to be one of the key genes responsible for a number of differences between these populations, including the thicker hair, more numerous sweat glands, smaller breasts, and dentition characteristic of East Asians.[7] … The 370A mutation arose in humans approximately 30,000 years ago, and now is found in 93% of Han Chinese and in the majority of people in nearby Asian populations.

The late, great, Satoru Iwata, accompanied by a caricature of a hard-working Caucasian toilet engineer
The late, great, Satoru Iwata, accompanied by a caricature of a hard-working Caucasian toilet engineer

Here, too, skin tones vary from north to south, though not as greatly as they do closer to the Greenwich Meridian. Most people have dark eyes, slim frames, and straight, smooth black hair.

Here in the megalopolis made famous by Beijing, Shanghai, Hong Kong, Seoul, and Tokyo, we have come to the end of the–first round–of our journey. From Africa to Asia, we have found three vast areas filled with people, and two major barriers which–though not completely impassible–have hindered humanity’s footsteps over the millennia.

People sometimes try to claim that human races do not exist simply because edge cases exist, small, scattered groups which possess a mixture of genes common to both Sub-Saharan Africans and Caucasians, Caucasians and Asians. And these groups do in fact exist, and are fascinating in their own rights. But these groups are also small, often living in extremely harsh, forbidding lands where few humans can survive (The inhabitants of the Himalayas and Tibetan plateau, I note, actually carry a gene that helps them survive at high altitudes which they received via an ancestor’s dalliance with a Denisovan hominin–the Denisovans were cousin to the Neanderthals and lived in Asia long before Homo Sapiens. No one else in the world carries this gene, so if you don’t have it, good luck living up there!)

But the vast, vast majority of the world’s people do not live in these harsh and unforgiving lands. They live clustered together in the enormous population centers, continually mixing, migrating, churning, and conquering each other, not people thousands of miles off. The concept of race stems from this basic observation of the geography of human settlements.

I totally stole this from Razib Khan, didn't I?
I totally stole this from Razib Khan, didn’t I?

Physical distance is genetic distance, but since my diagram is only two-dimensional, it can only show the genetic distance between two points at a time. The genetic distance between Asians and Caucasians is about 40k years–much shorter than the distance between Sub-Saharan Africans and Caucasians, 70k years. But the distance between Sub-Saharan Africans and Asians is also about 70k years. Although Asians and Caucasians split apart from each other about 40,000 years ago, they are both descended from a single group of ancestors (a handful of Denisovans and Neanderthals excluded) who left sub-Saharan Africa about 70k years ago. We may best think of the relationship between these three groups not as a single highway, but as a triangle with two sides 70k long and one side of 40k. But to accurately add more groups to our journey, (as we shall do on Thursday), we would have to keep adding dimensions, and we are aiming here for simplicity, not n-dimensional hypercubes.

When did Asians Evolve?

When did Asians evolve?

Humanity's path out of Africa
Humanity’s path out of Africa

The history of humanity’s long sojourn across the globe has resulted in, more or less, three main super-clades, or races: Sub-Saharan Africans, Caucasians, and Asians. The words we use for these are not perfect (“Caucasian” is particularly imprecise,) but do the job well enough.

Genetic distance map of 18 human groups, by Saitou Naruya https://en.wikipedia.org/wiki/Mongoloid#/media/File:Neighbor-joining_Tree-2.png
Genetic distance map of 18 human groups, by Saitou Naruya

The Asian super-clade has three main branches: Melanesians (and Aborigines,) who traveled south into the Pacific; the Native Americans, who settled North and South America some 13-40,000 years ago; and of course the East Asians, like the Chinese, Japanese, and Polynesians.

(Amusingly, Indians, though they clearly live in Asia, are part of the Caucasian clade because they are more closely related to Middle Easterners and Europeans than Chinese people. As a result, Indians were–for a while—recorded as “white” on US censuses, though today they are recorded as “Asian.”)

People are fond of saying that the SS African race contains the greatest genetic diversity (as well it might, due to the inclusion of groups like the Pygmies and Bushmen, who may have split off from other human groups over 100,000 years ago,) but the Asian race has the greatest pre-Columbian geographic/environmental range, stretching from Australia and Polynesia to Siberia and Greenland, from Mongolia to Patagonia.

Asian, Australian, and Melanesian ethic groups (including Indian, Middle Eastern, and Chinese) from Haak et al's dataset
Locations of Asian, Australian, and Melanesian ethic groups (including Indian, Middle Eastern, and Chinese) from Haak et al’s dataset

Trying to offer a single, coherent description of the physical appearances of such a diverse range of peoples is nearly impossible. They range in skin tone from almost white to as black as most of Africa; in stature from slight, Pygmy-like Negritos to the formidable Comanches (who in the 1800s were among the world’s tallest measured people;) and in average reported IQs from >105 to >65. (Okay, IQ isn’t appearance.)

We will be able to speak much more meaningfully about appearances when we address each of the sub-races.

Here are the relevant portions from Haak et al’s lovely dataset:

nativeamerican eskimoonge eastasian

On the left, we have the Native American DNA, from the depths of the Amazonian rainforest to the tribes of upstate New York. The olive green section are the Inuit/Eskimo and related Russian groups. The Inuit (who appear to have wiped out the earlier Dorset people,) share a great deal of DNA with other Siberians, eg the Yakuts (a Turkic people) and the Nganasan, (who speak a highly divergent language of the Samoyedic branch of the Uralic family, which also includes the Finnish, Hungarian, and Sami languages–language is a very bad guide to genetics.)

The pale peach are the Onge, who live in India’s Andaman Islands; purple the people of Papua New Guinea and Australia.

The very yellow part is all of the groups normally thought of as “East Asian,” like Japanese, Chinese, and Thai. Yellow is most dominant in the aboriginal people of Taiwan (who were there before the Chinese started migrating there in the past few hundred years,) and are the ancestors of the (not pictured) Polynesian peoples of Hawaii, Easter Island, and New Zealand. (I think they picked up some Melanesian DNA on the way.)

And on the right we have the various peoples of Siberia and central Asia.

I think it an open question whether the Melanesians and Aborigines ought to be properly classed with the other Asians, or awarded their own clade.

I totally stole this from Razib Khan, didn't I?
I stole this from Razib Khan, didn’t I?

According to Masatoshi Nei, a biology professor at Pennsylvania State University,[131]  the ancestors of today’s Asians and Caucasians split into two separate groups around 41,000 years ago, (give or take 15,000 years,) and their ancestors split from the ancestors of modern Africans–the “Out of Africa Event”–around 114,000 years ago, (give or take 34,000 years.)

 

The Daily Mail reports:

BERLIN (AP) — The human populations now predominant in Eurasia and East Asia probably split between 36,200 and 45,000 years ago, according to a study released Thursday.

Researchers used new techniques to analyze genetic samples from the shin bone of a young man who died at least 36,200 years ago near Kostenki-Borshchevo in what is now western Russia. The study, published in the journal Science, concludes that Kostenki man shared genetic sequences with contemporary Europeans, but not East Asians.

A separate study published last month in the journal Nature determined that a 45,000-year old sample found in Siberia contained sequences ancestral to both modern East Asians and Europeans.

Meanwhile:

In a genetic study in 2011, researchers found evidence, in DNA samples taken from strands of Aboriginal people’s hair, that the ancestors of the Aboriginal population split off from the ancestors of the European and Asian populations between 65,000 and 75,000 years ago—roughly 24,000 years before the European and Asian populations split off from each other. These Aboriginal ancestors migrated into South Asia and then into Australia…

A different study found:

The first complete sequences of the Y chromosomes of Aboriginal Australian men have revealed a deep indigenous genetic history tracing all the way back to the initial settlement of the continent 50 thousand years ago, according to a study published in the journal Current Biology today.

The Native Americans much more conveniently split off around 25,000 years ago.

Or in other words:

Also credit Robert Lindsay
Also credit Robert Lindsay

So on the one hand, race is biological and real, and on the other, it’s a social construct. Australian Aborigines are more closely related to other Asians than to, say, Europeans or Africans, but the Chinese are more closely related to Europeans than to Aborigines.

nature-siberian-neanderthals-17.02.16-v2One reason why Australians and other Melanesians appear so divergent from other Asian populations maybe their Denisovan (or other human) DNA. Most (if not all) human groups appear to have picked up DNA from some other, non-Homo Sapiens source. Europeans, East Asians, and Native Americans all have a small percent of Neanderthal DNA. Africans, IIRC, have a small % of some local African homin. And Melanesians/Australians have a small % of Denisovan DNA (Denisovans were a less-well-known cousin of the Neanderthals.)