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Tianyuan man
Hominin fossil from China From Wikipedia, the free encyclopedia
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Tianyuan man (simplified Chinese: 田园洞人; traditional Chinese: 田園洞人; pinyin: Tiányuándòng Rén) are the remains of one of the earliest modern humans to inhabit East Asia. In 2007, researchers found 34 bone fragments belonging to a single individual at the Tianyuan Cave near Beijing, China.[1][2] Radiocarbon dating shows the bones to be between 42,000 and 39,000 years old, which may be slightly younger than the only other finds of bones of a similar age at the Niah Caves in Sarawak on the South-east Asian island of Borneo.
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Subsistence
Nothing is known directly about the material culture of this individual, since so far no artifacts or other cultural remains have been found at the site.[2] Isotope analysis suggests that a substantial part of his diet came from freshwater fish.[3]
Physical anthropology
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Morphology
Tianyuan man is considered an early modern homo sapiens. He lacks several mandibular features common among western Eurasian late archaic humans, showing its divergence. Based on the rate of dental occlusal attrition, it is estimated he died in his 40s or 50s.[2] The observed derived modern human features and the high crural index of Tianyuan 1, suggest "some relatively recent ancestry among more equatorial populations".[4]
Archaeogenetics
The first DNA analysis of the Tianyuan remains (focussing on mtDNA and chromosome 21) was published in 2013 and revealed that Tianyuan man is related "to many present-day Asians and Native Americans" and had already diverged genetically from the ancestors of modern Europeans.[5] He belonged to mitochondrial DNA haplogroup B,[5] and paternal haplogroup K2b.[6]
A genome-wide analysis confirmed the close affinity of Tianyuan man to modern East Asian and Southeast Asians; it also showed that he is not directly ancestral to modern populations, but rather represents a deeply diverged member of the East and Southeast Asian (ESEA) lineage, basal to all later populations of East and Southeast Asia.[7][8][9] The Tianyuan man was determined to be part of an Initial Upper Paleolithic wave (>45kya) "ascribed to a population movement with uniform genetic features and material culture" (Ancient East Eurasians), and sharing deep ancestry with other ancient specimens such as Bacho Kiro, Peștera cu Oase, the Ust'-Ishim man, as well as the ancestors of modern day Papuans (Australasians).[10] The lineage ancestral to the Tianyuan man (dubbed as the "ESEA" lineage) is inferred to have diverged from the Ancient East Eurasians, following a Southern Route dispersal, and subsequently diverged into the Hoabinhian lineage, the Tianyuan lineage, and a lineage ancestral to all modern East and Southeast Asians.[9]
The Tianyuan lineage can be modeled to have emerged by a Paleolithic admixture event between a primarily Onge-like source from Southeast Asia (c. 61%) and from a deeply diverged East Eurasian source associated with the IUP movements into Siberia (c. 39%), which were distantly related to the Bacho Kiro cave remains.[11][12][13][10] An earlier model estimated around 64% ancestry related to Eastern Asians and 36% ancestry represented by the deeply diverged Ust'-Ishim man.[14]
Tianyuan man also exhibits a unique genetic affinity for GoyetQ116-1 from the Goyet Caves in Namur province, Belgium. GoyetQ116-1 shares more alleles with Tianyuan man than does any other sampled ancient individual from West Eurasia.[7] The GoyetQ116-1 specimen is inferred to have received 17-23% ancestry from an IUP-affilated population distantly related to that one which also contributed to the Tianyuan man.[15][11]
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Ancestry related to the Tianyuan man is defined as Basal East Asian (BEA); ancestry related to Ancient East Asians (AEA); ancestry related to Ancient Northern East Asian (ANEA); ancestry related to Ancient Southern East Asian (ASEA); ancestry related to Ancient Guangxi population (Longlin/AGX).
The Tianyuan man displays high genetic affinities to a 33,000 year old specimen (AR33K) between the Amur region and modern day Mongolia, suggesting that Tianyuan-like ancestry was spread widely in Northeastern Asia during the Paleolithic period. This specific group is also known as "Tianyuan cluster".[17][18]
Contributions to later populations
Ancient and modern East Asians can be modeled to derive most of their ancestry from an Onge-like source (76–79%) with geneflow from a Tianyuan-like source (21–24%). Since around 26 to 22kya, the Tianyuan cluster became replaced by East Asian-like ancestry.[13][19][12]
A Tianyuan-like population contributed around 29-50% ancestry to the Ancient North Eurasians, with the remainder being made up by Early West Eurasian ancestry represented by the Kostenki-14 specimen. A c. 34,000 year old specimen from Northern Mongolia (Salkhit) derives approximately 75% ancestry from a Tianyuan-like population, with the remainder (25%) being derived from a Yana-like population. The Salkhit individual displayed a complex bi-directional relationship to the Ancient North Eurasians.[20][15][10]
Basal East Asian or "Deep Asian" ancestry represented by Tianyuan or Andamanese Onge contributed to the Peopling of Southeast Asia, following deeply diverged Australasian ancestry and preceding Mesolithic and Neolithic expansions of Ancient Southern East Asians associated with the spread of Austroasiatic and Austronesian languages.[16]
The Tianyuan man also shares more alleles with South American populations, such as the Surui and Karitiana in Brazil and Chane in northern Argentina and southern Bolivia, than with other indigenous Americans.[21]
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See also
References
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