ࡱ> #` (bjbj\.\. .>D>DG%0000000D8$Dh|DJ9D:* "L L L '!'!'!8888888$:h<8Q02'!'!22800L L 955520L 0L 852855005L  ?%4|5690J95~=4v~=55X~=0!6h'!'<5Q+d.'!'!'!88q5X'!'!'!J92222DDD  DDDDDD000000 Early Modern Homo sapiens All people today are classified as Homo sapiens sapiens - i.e., the sapiens variety of the species Homo sapiens. They first began to appear 130,000 years ago or somewhat earlier in association with technologies not unlike those of the early Neanderthals. It is now clear that they did not come after the Neanderthals but were their contemporaries. Compared to the Neanderthals and other late archaic Homo sapiens, modern humans generally have more delicate skeletons. Their skulls are more rounded and their brow ridges protrude less. They also have relatively high foreheads and pointed chins.  INCLUDEPICTURE "http://anthro.palomar.edu/homo2/images/modern_human_and_Neandertal_skulls.gif" \* MERGEFORMATINET  Neanderthal modern Homo sapiensThe first fossils of early modern humans to be identified were found in 1868 in a 30,000 year old rock shelter site near the village of Les Eyzies in southwestern France. They were subsequently named the Cro-Magnon people. They were very similar in appearance to modern Europeans. Males were 5 feet 4 inches to 6 feet tall (1.6-1.8 m.) That was 4-12 inches (10-31 cm.) taller than Neanderthals. Their skeletons and musculature generally were less massive than the Neanderthals. The Cro-Magnon had broad, small faces with pointed chins and high foreheads. Their cranial capacities were up to 1590 cm3, which is relatively large even for people today. Origins of Modern Humans Current data suggest that modern humans evolved from archaic Homo sapiens primarily in East Africa. A 160,000 year old skull from the Herto site in the Middle Awash area of Ethiopia seems to be at the beginning of this transition. It had the rounded skull case of modern people but retained the large brow ridges of archaic Homo sapiens. Somewhat more advanced transitional forms have been found at Omo in Ethiopia and Laetoli in Tanzania dating to about 130,000 and 120,000 years ago respectively. By 115,000 years ago, early modern humans had expanded their range to South Africa and into Southwest Asia shortly after 100,000 years ago. Evidently, they did not appear elsewhere in the Old World until 60,000-40,000 years ago. This was during a short temperate period in the midst of the last ice age. Important Early Modern Homo sapiens Sites INCLUDEPICTURE "http://anthro.palomar.edu/homo2/images/map_of_early_modern_Homo_sapiens_sites.gif" \* MERGEFORMATINET  Years Ago (approximate)  East Africa: Herto, Middle Awash1 160,000-154,000 Omo 130,000 Laetoli 120,000 South Africa: Border Cave 115,000-90,000 Klasies River Mouth 90,000 Israel: Skhul and Qafzeh 92,000 Australia: Lake Mungo 60,000-46,000 Europe: 2 Pe_tera cu Oase (Romania) 36,000-34,000 Mlade  and PYedmost (Czech Republic) 35,000-25,000 Cro-Magnon (France) 30,000-23,000  It would seem from these dates that the location of initial modern Homo sapiens evolution and the direction of their dispersion from that area is obvious. That is not the case. Since the early 1980's, there have been two leading contradictory models that attempt to explain modern human evolution--the replacement model and the regional continuity model. The replacement model of Christopher Stringer and Peter Andrews proposes that modern humans evolved from archaic Homo sapiens 200,000-150,000 years ago only in Africa and then some of them migrated into the rest of the Old World replacing all of the Neanderthals and other late archaic Homo sapiens beginning around 100,000 years ago. If this interpretation of the fossil record is correct, all people today share a relatively modern African ancestry. All other lines of humans that had descended from Homo erectus presumably became extinct. From this view, the regional anatomical differences that we see among humans today are recent developments--evolving mostly in the last 40,000 years. This hypothesis is also referred to as the "out of Africa", "Noah's ark" and "African replacement" model. The regional continuity (or multiregional evolution) model advocated by Milford Wolpoff, of the University of Michigan, proposes that modern humans evolved more or less simultaneously in all major regions of the Old World from local archaic Homo sapiens. For example, modern Chinese are seen as having evolved from Chinese archaic Homo sapiens and ultimately from Chinese Homo erectus. This would mean that the Chinese and some other peoples in the Old World have great antiquity in place. Supporters of this model believe that the ultimate common ancestor of all modern people was an early Homo erectus in Africa who lived at least 1.8 million years ago. It is further suggested that since then there was sufficient gene flow between Europe, Africa, and Asia to prevent long-term reproductive isolation and the subsequent evolution of distinct regional species. It is argued that intermittent contact between people of these distant areas would have kept the human line a single species at any one time. However, regional varieties, or subspecies, of humans are expected to have existed.  INCLUDEPICTURE "http://anthro.palomar.edu/homo2/images/models_of_Hss_evolution.gif" \* MERGEFORMATINET  Replacement Model Arguments There are two sources of evidence supporting the replacement model--the fossil record and DNA. So far, the earliest finds of modern Homo sapiens skeletons come from Africa. They date to at least 130,000 years ago on that continent. They appear in Southwest Asia by at least 100,000 years ago and elsewhere in the Old World by 60,000-40,000 years ago. Unless modern human remains dating to 130,000 years ago or earlier are found in Europe or East Asia, it would seem that the replacement model better explains the fossil data for those regions. However, the DNA data supporting a replacement are more problematical. Beginning in the 1980's, Rebecca Cann, at the University of California, argued that the geographic region in which modern people have lived the longest should have the greatest amount of genetic diversity today. Through comparisons of mitochondrial DNA sequences from living people throughout the world, she concluded that Africa has the greatest genetic diversity and, therefore, must be the homeland of all modern humans. Assuming a specific, constant rate of mutation, she further concluded that the common ancestor of modern people was a woman living about 200,000 years ago in Africa. This supposed predecessor was dubbed "mitochondrial Eve". More recent genetic research at the University of Chicago and Yale University lends support to the replacement model. It has shown that variations in the DNA of the Y chromosome and chromosome 12 also have the greatest diversity among Africans today. John Relethford and other critics of the replacement model, have pointed out that Africa could have had the greatest diversity in DNA simply because there were more people living there during the last several hundred thousand years. This would leave open the possibility that Africa was not necessarily the only homeland of modern humans. Critics of the genetic argument for the replacement model also point out that the rate of mutation used for the "molecular clock" is not necessarily constant, which makes the 200,000 year date for "mitochondrial Eve" unreliable. The rate of inheritable mutations for a speciescan vary due to a number of factors including, generation time, the efficiency of DNA repair within cells, and varying amounts of natural environmental mutagens. In addition, some kinds of DNA molecules are known to be more subject to mutation than others, resulting in faster mutation rates. This seems to be the case with the Y chromosome in human males. Further criticism of the genetic argument for the replacement model has come from geneticists at Oxford University. They found that the human betaglobin gene is widely distributed in Asia but not in Africa. Since this gene is thought to have originated more than 200,000 years ago, it undercuts the claim that an African population of modern Homo sapiens replaced East Asian archaic Homo sapiens less than 50,000 years ago. Regional Continuity Model Arguments Fossil evidence also is used to support the regional continuity model. Its advocates claim that there has been a continuity of some anatomical traits from archaic Homo sapiens to modern humans in Europe and Asia. In other words, the Asian and European physical characteristics have antiquity in these regions going back over 100,000 years. They point to the fact that many Europeans have relatively heavy brow ridges and a high angle of their noses reminiscent of Neanderthals. Similarly, it is claimed that some Chinese facial characteristics can be seen in Asian archaic Homo sapiens dating to 200,000 years ago. Like Homo erectus, East Asians today commonly have shovel-shaped incisors while Africans and Europeans rarely do. This supports the contention of direct genetic links between Asian Homo erectus and modern Asians. Alan Thorne of the Australian National University believes that Australian aborigines share key skeletal and dental traits with people who inhabited Indonesia at least 100,000 years ago. The implication is that there was no replacement by modern humans from Africa 60,000-46,000 years ago. However, the evidence does not rule out gene flow from African populations to Europe and Asia at that time and before. David Frayer, of the University of Kansas, believes that a number of European fossils from the last 50,000 years have characteristics that are the result of archaic and modern Homo sapiens interbreeding. Assimilation Model It is apparent that both the complete replacement and the regional continuity models have difficulty accounting for all of the fossil and genetic data. What has emerged is a new hypothesis known as the assimilation (or partial replacement) model. It takes a middle ground and incorporates both of the old models. Gunter Brauer, of the University of Hamburg in Germany, proposes that the first modern humans did evolve in Africa, but when they migrated into other regions they did not simply replace existing human populations. Rather, they interbred to a limited degree with late archaic Homo sapiens resulting in hybrid populations. In Europe, for instance, the first modern humans appear in the archaeological record rather suddenly shortly before 40,000 years ago. The abruptness of the appearance of these Cro-Magnon people could be explained by their migrating into the region from Southwest Asia and possibly North Africa. They apparently shared Europe with Neanderthals for another 12,000 years. During this long time period, it is argued that interbreeding occurred and that the partially hybridized predominantly Cro-Magnon population ultimately became modern Europeans. In 2003, a discovery was made in a Romanian cave named Pe_tera cu Oase that supports this hypothesis. It was a partial skeleton of a 15-16 year old male Homo sapiens who lived about 30,000 years ago. He had a mix of old and new anatomical features. The skull had characteristics of both modern and archaic Homo sapiens. This could be explained as the result of interbreeding with Neandertals according to Erik Trinkaus of Washington University in St. Louis. Alan Templeton, also of Washington University, reported that a computer-based analysis of 10 different human DNA sequences indicates that there has been interbreeding between people living in Asia, Europe, and Africa for at least 600,000 years. This is consistent with the hypothesis that humans expanded again and again out of Africa and that these emigrants interbred with existing populations in Asia and Europe. It is also possible that migrations were not only in one direction--people could have migrated into Africa as well. Expansion Out of the Old World The global population of modern Homo sapiens began to grow rapidly around 50,000-40,000 years ago. It was around that time they began to migrate into regions not previously occupied by people. Their movement into far northern areas coincided with the end of a long cold period that had begun about 75,000 years ago. Modern humans apparently moved into Australia for the first time between 60,000 and 46,000 years ago. Since Australia was not connected to Southeast Asia by land, it is probable that the first Australians arrived by simple boats or rafts. Around 35,000-30,000 years ago, human big game hunters moved into Northeastern Siberia. Some of them migrated into North America via the Bering Plain (or Beringia) 20,000-15,000 years ago or possibly somewhat earlier. That intercontinental land connection appeared between Siberia and Alaska as a result of sea levels dropping more than 300 feet during the last ice age. Until that time, all human evolution had occurred in the Old World. The rate of human population growth has continued to accelerate since then. The current world population is over six billion and intercontinental migration and gene flow are at higher levels than ever before. A consequence of human migrations into new regions of the world has been the extinction of many animal species indigenous to those areas. By 11,000 years ago, human hunters in the New World apparently had wiped out 135 species of mammals, including 3/4 of the larger ones. Most of these extinctions apparently occurred within a few hundred years. It is likely that the changing climate at the end of the last ice age was also a contributing factor. However, the same cannot be said for the animal extinctions that occurred following the arrival of aboriginal people in Australia and Polynesians in New Zealand. In both cases, humans were instrumental in wiping out easily hunted species. Large vulnerable marsupials were the main victims in Australia. In New Zealand, it was mostly large flightless birds that were driven to extinction by hunters. It is sobering to realize that the rate of animal and plant extinction has once again accelerated dramatically. During the last century and a half, the explosion in our global human population and our rapid technological development has allowed us to move into and over-exploit most areas of our planet. That exploitation has usually involved cutting down forests, changing the courses of rivers, pushing wild animals and plants out of farm and urban areas, polluting wetlands with pesticides and other man-made chemicals, and industrial-scale hunting of large land animals, whales, and fish. During the early 19th century, there were at least 40,000,000 bison roaming the Great Plains of North America. By the end of that century, there were only a few hundred remaining. They had been hunted to near extinction with guns. The same fate came to the African elephant and rhinoceros during the 20th century. Likewise, commercial fishermen have depleted one species of fish after another during the last half century. Governments have had to step in to try to stem the tide of these human population effects on other species. However, they have been only marginally successful. The World Conservation Union conservatively estimates that 7,266 animal species and 8,323 plant and lichen species are now at risk of extinction primarily due to human caused habitat degradation. The endangered list includes one third of all amphibian species, nearly half of the turtles and tortoises, one forth of the mammals, one fifth of the sharks and rays, and one eighth of the birds. This list does not include the many millions of species that are still unknown to science. It is likely that most of them will become extinct before they can be described and studied. Mankind Today Are we genetically different from our modern human ancestors who lived 10-20,000 years ago? The answer is almost certainly yes. In fact, it is very likely that the rate of evolutionary change for our species has continuously accelerated since the end of the last ice age, roughly 10,000 years ago. This is mostly due to the fact that our human population has explosively grown and moved into new kinds of environments, including cities. As a consequence, we have been subject to new natural selection pressures. For instance, our larger and denser populations have made it far easier for contagious diseases, such as small pox and the plague, to rapidly spread through communities and wreak havoc. This has exerted strong selection for individuals who were fortunate to have immune systems that allowed them to survive. We have been exposed to new kinds of environmental pollution that can cause increased mutation rates. There has been a marked change in diet for most people around the globe to one that is less varied and now predominantly vegetarian with a heavy dependence on foods made from cereal grains. It is not entirely clear what all of the consequences of these environmental and behavioral changes have been. However, it does appear that the average human body size has become somewhat shorter over the last 10,000 years. Finally, can we say what direction human evolution will take in the future? This is a fascinating question to consider but impossible to answer because of innumerable unknown factors. Though, it is certain that we will continue to evolve until we reach the point of extinction.  NEWS: In a December 2002 report in the Journal of Human Evolution, it was announced that a modern Homo sapiens skull from Liujiang County in Southern China has been tentatively dated to 139,000-111,000 years ago and that modern Homo sapiens teeth from two other sites in the same area have been dated to 94,000 years ago. If these dates are confirmed, it will be a significant blow to the out of Africa replacement model" of modern human evolution. NEWS: In a February 2006 review in the journal Nature, Paul Mellars announced that recent developments in the calibration of radiocarbon dating have resulted in a revision of the dating for the arrival and spread of modern humans in Europe. 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