Bill Kelso
The Emergence of the Asian Race
If the rise of the black race occurred roughly 2 million years ago when we became the naked ape, the emergence of both Asians and Caucasians as separate races is an even more recent event. The fossil evidence indicates that the rise of Asians and Caucasian among modern Homo Sapiens may have occurred somewhere between 40 to 30 thousand years ago. Since modern Homo Sapiens evolved around 250,000 years ago, the rise of two new races is a fairly recent occurrence.
How the Higher Latitudes Shaped the Asian Race
The incident that spurred the creation of two new races, Asians and Whites, was the decision by modern Homo Sapiens to leave the tropics and migrated to higher latitudes in Asia and Europe. As the population of early human in Africa began to increase, there was growing competing between different groups of early humans for better hunting grounds. To avoid conflict at home as the continent filled up with people, early humans decide to travel north in pursuit of better hunting and gathering opportunities. What seemed like a simple economic decision at the time, eventually radically altered the appearance of the human race.
Once again changes in the latitude and later the environment that early Africans migrated to and eventually colonized eventually led to the creation of multiple racial groups on the planet. While the origins and early presence of the black race was shaped by the climate of the equator, the origins of the two lighter color races, Asians and Caucasians, was shaped by the very different conditions at the higher latitudes.
If the areas of the equator suffered from two much sunshine and heat, higher latitudes suffer from too little sunlight. As is obviously the case, the factors that explain why there is an excess of sunlight at the tropics, also explains why there is a deficiency of sunshine at higher latitudes.
For example, because of the curvature of the earth, sunlight is widely scattered over a large area of land, diminishing the intensity of sunshine in northern latitudes. But even more importantly because of the tilt of the earth, northern areas of the planet will often only receive minimal sunshine or ultraviolet rays for many months of the year.
The Danger of Too Little Sunshine
Just as dark skins provide an evolutionary advantage to Africans living next to the equator, lighter skin colors provided a similar biological advantage to individuals living north or south of the equator. While too much sun and exposure to ultraviolet rays may cause medical problems, exposure to too little sunshine can be equally harmful to the health of humans. When individuals live at high latitudes with minimal or mild sunlight, they are at risk of suffering from vitamin D deficiency. The medical problems caused by our body’s inability to produce vitamin D in low sunlight are numerous ranging from minor problems such as fatigue to more serious illness such as developing rickets, suffering from a variety of cancers, experiencing cognitive decline, having immune problems or plagued by cardiovascular disease.
Faced with the above medical problems, humans evolved much lighter skin coloring once they migrated north to overcome the problems of less sunshine. Because individuals with lighter skin tones have less melanin, they can absorb UV radiation, more efficiently which enables them to produce vitamin D more effectively. Because the further north individuals go, the less sunshine they encounter, the greater is the biological pressure on individuals to evolve whiter skin tones.
While the concern of this post is with the evolution of humans it is interesting to note that the development of different races among humans is a trait that it shares with many other animals. For instance, in the southern part of the US, there are numerous bears that all have black fur. But if you travel north to Montana or even Alaska the black blacks have evolve into brown bears or grizzles. If you go further north to the arctic, grizzle bears have evolved once again into polar bears. As the above examples reveal evolution’s impact on our skin or fur covering is not just limited to our own species, but affect many other animals species as well.
Why Did Two Light Colored Races Appear
Because of the distinctive environmental pressures cited above it is easy to understand why humans all became distinctively lighter in color as they moved north. But the question that remains to be answered is why human created two new racial groups rather than just one.
Why don’t all humans in northern latitudes look alike? The answer is that when modern humans decided to migrate north, they left in two distinct waves. These two waves in turn followed very different migration paths which resulted in the separate groups living in very different environments. To fully understand why Asians evolved differently from Caucasians we need to examine in more detail 1) the actual migration route Asians followed as well as 2) the climate of their final destination. As we shall see shortly many physical anthropologists think the physical makeup of Asians primarily reflects their settlement in a very cold climate.
The Migratory Path of the People who Became Asians.
The migration path of individuals who evolved into Asians has two separate parts. In their initial or first leg of their migration out of Africa, they primarily departed from either the horn of Africa through Saudi Arabia or from Egypt to the area east of the Caspian Sea. To quickly find this body of water, click the link below and place your mouse on the map, which will enlarge the lands masses and clearly make visible the Caspian Sea. If you are still uncertain of this location, it is the area just north of Iran which is colored green. From this area, the groups that in the future will become Asians will turn east and travel towards China.
Map of the Caspian Sea
Now that we know where the Caspian Sea is, we need to take a larger bird’s eye view of the world atlas and compare the different routes the two groups took out of Africa. While the group that became Caucasians took a turn left and migrated northwest into Europe, settling eventually in areas close to the Arctic Circle, such as northern Russia and Scandinavia, the individuals who would be Asians settled in at lower latitudes. The areas in the map listed below which is colored blue will become the home of Caucasians and the grey area under the blue portion of the map will become the residence of Asians.
Percentage of the population who are blond
Since the travelers who migrated towards Europe settled in area of much higher latitude than those living east of the Caspian Sea, they faced real risks of vitamin D deficiency. Given these medical threats, natural selection created individuals with very white skins, and even blond hair.
Since those who became Asians settled in an area at a much lower latitude, they faced less danger than their European counterparts of experiencing little sunshine. As a result, the biological pressure to lighten their skin tones was less intense. In the above internet link, we see that all those who develop fair skins and even blond hair, are primarily from Scandinavia and northern Russia. Because Asians occupied lower latitudes they retained their black hair and evolved generally darker skin tones than their Caucasian counterparts.
The Second Migratory Path of Asians.
As significant as the first part of their journey was, the second part of their trip by the people who became Asians was equally important. After they reached the areas east of the Caspian Sea, the future population of Asians began a 3000 march eastward through what is today called Siberia, a journey that probably took several thousands of years to complete. This was a long and dangerous migration during a hard and unforgiving ice age.
Before examining this environment of Siberia, it is helpful to understand how Asians settled East Asia. While Europeans colonized their continent by traveling from the south to the north, Asians colonized their continent by traveling from the north to the south.
Dzungarian Pass
If we look at the following link, it becomes much clearer how the settlement of Asia differed from that of Europe. As the future population of Asians migrated eastward, they followed the Tien Shan range of mountains until they came to one of the most important mountain passes in the world, which is called the Dzungarian Pass, a pass that separates the Tien Shan Mountains from the Altai Mountains. Once you hit the following link, scroll down and you will clearly see the pass separating the two red circles outlining the different mountain chains.
Map of Altai mountains,
Once we know where the Dzungarian pass is, we can take a larger view and see how the people who became Asian settled their continent. If you put your mouse over the light purple area in the following internet link, the country today called Kazakhstan ends where the Dzungarian pass begins. As Asians poured through this gap between the above two mountain chains, their group split with some traveling northward around Mongolia to become the future populations of Koreans and Japanese.
Map of Europe and Asia and Route of Asians
Leaving aside the development of northern Asian populations, the remaining migrants went southward in what is today called China. If you look at the letter a in the name for Mongolia and scan downward in the following duplicate map of Asia, you will find the city Xian (pronounced Shian) which will become the first capital of the Chinese people. Over thousands of years, the Chinese will move southward, eventually conquering the whole country. In the process they will also spin off other Asian groups such as the people of Thailand and Cambodia who will all migrate from south China into Southeast Asia, becoming separate Asian ethnic groups. Asia is thus settled from the top down as opposed to Europe which early humans colonized from the bottom up.
Map of Europe and Asia and Route of Asians
If you are wondering whether some people elected not to go through southward through the Dzungarian Pass you would be absolute right. Those individuals will eventually end up in Alaska and become the indigenous Indian population we find in north and south America today.
The Impact of Climate on the Asian Population
Given both the length and time involved in their long and difficult route through Siberia, it should not surprise us that their journey had a profound impact on their racial identity. Leaving aside for the moment the fact that Asians and European initially elected to settle at different latitudes, their different routes out of Africa resulted in these two separate populations facing very different environmental and weather conditions. This latter situation may surprise you as both groups began their norther migration to Eurasia at the very same time as the earth was in the midst of a severe ice age. From 2 million years ago to 10,000 years ago temperatures on the planet dropped significantly.
Even though the world as a whole was in an ice age, the severity of that ice age varied from one region to the next. For example, in a planet as diverse as ours, there is a significant difference in the climate of a maritime as opposed to a continental land mass. While the overall planet was cooling, a maritime area like Europe which is surrounded by water on three sides was considerably less frigid compared to a continental land mass like Siberia which experienced the full force of the ice age. Since Siberia was distant from any bodies of water, she experienced a dry windy climate with incredibly low temperatures.
Why these two different land masses faced such different climates is a topic we will explore in the next section. But the significance of these climate changes is that they equaled the impact of latitude in shaping the creation of two new races. As we saw earlier, the impact of latitude on the creation of Asians and Caucasians was primarily limited to the color on their skin.
In this post, we want to show how the climate and environment of Siberia and Europe, in contrast, had a much larger impact in shaping their bodily and facial characteristics rather than their skin color. When blacks, Asians and Caucasians finally evolved, they all had slightly different types of scalp hair, facial hair, noses, and eys as well as skin color.
How a Cold Climate Affects our Facial and Bodily features.
Hopefully as the follow discussion will make clear, the distinctive appearance of Asians may reflect their development in a very cold climate. In the 19th century biologists formulated two separate rules suggesting how living in an intensely cold region will affect an individual’s anatomy including his race.
Bergman’s Rule
While physical anthropologists have modified their findings, the first rule which is called Bergmann’s rule states that in colder climates individuals are likely to have more compact bodies than in warm areas. In a very cold climate, the last thing you want is to have a body that is tall, thin and lanky. The reason for this development is that individuals who have compact bodies have a lower surface area to volume ratio than in lanky body types and are thus less likely to lose heat to the environment.
Allen’s Rule
Complimenting Berman’ s Rule is Allen’s rule which argues that in cold climates individual will not want to have appendages such as large noses or ears that extend out from your body. The larger and more extended your facial features are, the more likely they will become frozen and cause bodily harm. As was true of your body the more compact and rounded your facial feature are the smaller the ratio of surface area to volume which conserves bodily heat.
The Bodily and Facial Features of Asians
When we look at the anatomy and facial features of Asian, they seem to reflect the above two rules. For instance, today you find very few lanky Asians. When we look at the average height of someone from both Japan or China, we find that the average female is 5.2 feet tall and the average man is 5.7 in both countries. Among Mongolians who are in the middle of Siberia, there is a slight decrease in height as men average 5.6 feet and women are even more diminutive at 5.1 inches.
Body Size
As further confirmation of the role climate may play in shaping your physical appearance, we can compare Asians to what Europeans called the elongated African of East Africa. In East Africa, which is a relatively hot and dry Savannah, we find many tribes such as the Somali, the Fulani, and the Tutsi who are thin and lanky and close to 6 feet tall. The Maasi who live in Kenya are the tallest of the East African tribes and average over 6 feet 2.5 inches tall.
Facial Features: Noses and Eyes
The facial features of Asians also lend evidence for Allen’s rule. In contrast to Caucasians who have the largest noses of all three races, Asians tend to have relatively small noses. If viewed from the side Asians tend to have a lower nasal bridge than Caucasians, and a rounder tip. A bridge of a nose is merely the boney upper portion of your nose that connects with lower portion forming the nostril of your nose.
If you compare the profiles of Caucasians and Asians, Asians will also have a flatter shaped face. These features are well suited for a group of individuals who spend thousands of years slowly traveling through a very frigid Siberia.
The same principles apply to the makeup of their eyes. While we will discuss this topic in more detail in the final section of this post, Asian eyes are less rounded than Caucasian eyes and have a special fold at the bottom of their eye which is called an epicanthic fold. Evidently all humans have the ability to produce their fold, but if you possess a large nose, as do Caucasians, the fold remains hidden.
Once again, this unique anatomical feature benefitted Asians traveling through Siberia. Because the Siberia is landlock, Siberia was not covered with snow during the Great Ice Age. As a result the population that would became Asians had to deal with intense dry cold winds which created large dust storms in the center of Asia. These storms were especially dangerous for the eyes of people living or traveling through Siberia. By developing the epicanthic fold, Asians developed some protection for their eyes as the epicanthic fold shielded their cornea from potentially damaging dust winds.
Facial Hair: Scalp Hair and Bearded Hair
Finally the scalp hair of Asians is well adapted for living a prolonged period in a cold climate. While Africans generally have very thick scalp hair that is kinky, which is just a synonym for curly hair, Asians tend to have straight hair of average thickness. Why the difference? In Africa individuals developed thick kinky hair because it is very effective in diffusing heat from your head, preventing people’s scalps from overheating in the tropics.
Since Asians were living in a very cold climate far from the equator, they evolved straight hair thet helped them retain rather than diffuse heat from their scalps. But like their African ancestors, they kept the black color of the Africans ancestors because the color black retains heat.
Since the color of your hair is genetically related to the color of your skin, Africans could do very little about the color of their hair. But in light of the thick and curly nature of their scalp hair, dark hair has little negative effect on the health of Africans. But for Asians both the color and shape of their hair helped them adapt to their cooler climate.
When we look at facial rather than scalp hair, we also find that Asians are the racial group least likely to have beards. As we shall see when we discuss Caucasians, while a beard may provide some warmth for men in mildly cold climates. they can be downright painful in a very harsh and intensely cold climate. When it gets very cold, you facial hair will freeze causing incredible discomfort.
The Color of Your Skin
Finaly the harsh environment of Siberian even had an impact on the skin tones of Asians. As we discussed earlier, the latitude at which you live is the primary determinant of your skin color. But the environment may also influence the overall color of your skin. Just as the rain forest of Africa darkened the skin tones of Africans, the dry windy and very cold climate of Asia affected the appearance of people’s color in Siberia.
With the absence of snowfall in Siberia the winds stirred up huge dust storms of soil called loess that was yellow in color. Since early humans were primarily hunter gathers, they naturally wanted to blend in with their environment to enhance their hunting skills. While their latitude gave future Asians an olive color to their skin, they evolved a slighter lighter and yellow skin color to reflect their environment.
Tomorrow we will look at the rise of the Caucasian Race.
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