The indigenous peoples of Western New Guinea in Indonesia and Papua New Guinea, commonly called Papuans,[1] are Melanesians. There is genetic evidence for two major historical lineages in New Guinea and neighboring islands: a first wave from the Malay Archipelago perhaps 50,000 years ago when New Guinea and Australia were a single landmass called Sahuland, much later, a wave of Austronesian people from the north who introduced Austronesian languages and pigs about 3,500 years ago. They also left a small but significant genetic trace in many coastal Papuan peoples.
The term "Papuan" is used in a wider sense in linguistics and anthropology. In linguistics, "Papuan languages" is a cover term for the diverse, mutually unrelated, non-Austronesian language families spoken in Melanesia, the Torres Strait Islands, and parts of Wallacea. In anthropology, "Papuan" is often used to denote the highly diverse aboriginal populations of Melanesia and Wallacea prior to the arrival of Austronesian-speakers, and the dominant genetic traces of these populations in the current ethnic groups of these areas.[3]
The language families in Ross's conception of the Trans-New Guinea language family
Ethnologue's 14th edition lists 826 languages of Papua New Guinea and 257 languages of Western New Guinea, a total of 1083 languages, with 12 languages overlapping. They can be divided into two groups, the Austronesian languages, and all the others, called Papuan languages for convenience. The term Papuan languages refers to an areal grouping, rather than a linguistic one. So-called Papuan languages comprise hundreds of different languages, most of which are not related.[5][6]
The following indigenous peoples live within the modern borders of Indonesia and Papua New Guinea. Austronesian-speaking (AN) groups are given in italics.
Newly married Papuan couple in Jayapura, Indonesia
Origin and genetics
Phylogenetic position of the Papuan lineage among other East Eurasians.
Schematic summary of population settlement in Insular Southeast Asia, involving several East Eurasian lineages: (A) Initial occupation of Sunda and Sahul by ancestry related to modern New Guinean and Australian Aboriginal populations, followed by deep mainland Asian (Tianyuan- or Onge-related) ancestry. (B) Dispersals of ancestries associated with ancient Mainland Southeast Asian and ancestral Punan-related components predating the coastal South Chinese, and hence Austronesian-related, ancestries. (C) Austronesian expansion leading to Austronesian (Ami- and Kankanaey-related) ancestry observed in NE and SE Borneans and subsequent specific Papuan ancestry admixture observed in the Lebbo population in East Borneo.
The origin of Papuans is generally associated with the first settlement of Australasia by a lineage dubbed 'Australasians' or 'Australo-Papuans' during the Initial Upper Paleolithic, which is "ascribed to a population movement with uniform genetic features and material culture" (Ancient East Eurasians), and sharing deep ancestry with modern East Asian peoples and other Asia-Pacific groups.[10][11][12] It is estimated that people reached Sahul (the geological continent consisting of Australia and New Guinea) between 50,000 and 37,000 years ago. Rising sea levels separated New Guinea from Australia about 10,000 years ago. However, Aboriginal Australians and Papuans had diverged genetically much earlier, around 40,000 years BP. Papuans are more closely related to Melanesians than to Aboriginal Australians.[13][12]
Haplogroups
The majority of Papuan Y-DNA Haplogroups belong to subclades of HaplogroupMS, and HaplogroupC1b2a. The frequency of each haplogroup varies along geographic clines.[14][15]
Autosomal DNA
The genetic makeup of Papuans is primarily derived from Ancient East Eurasians, which relates them to other mainland Asian groups such as the "AASI", Andamanese, as well as East/Southeast Asians, although Papuans may have also received some gene flow from an earlier group (xOoA), around 2%,[16] next to additional archaic Denisovan admixture in the Sahul region. Papuans may habor varying degrees of deep admixture from "a lineage basal to West and East-Eurasians which occurred sometimes between 45 and 38kya", although they are generally regarded "as a simple sister group of Tianyuan" ("Basal East Asians").[11][12][10]
PCA plot of genetic variation of worldwide populations. Papuans (green) cluster relative close to other East Eurasians, such as East/Southeast Asians.
There is evidence that the ancestors of Papuans and related groups "underwent a strong bottleneck before the settlement of the region, and separated around 20,000–40,000 years ago".[17]
Papuans display pronounced genetic diversity, explained through isolation and drift between different subgroups after the settlement of New Guinea. The most notable differentiation was found to be between Highlanders and Lowlanders. Papuan Highlanders fall into three clusters, but form a single clade compared against Lowlanders. The Highlanders underwent a population bottleneck around 10,000 years ago, associated with the adaption of Neolithic lifestyles. Papuan Lowlanders display increased diversity and can be broadly differentiated into a Southern Lowlander cluster and a Northern Lowlander cluster. The genetic differentiation among Papuans is suggested to date back at least 20kya, while the sub-structure among Highlanders dates back around 10kya, with higher diversity among western Highlanders than Eastern ones. The genetic diversity is paralleled by linguistic and cultural diversity.[18]
Archaic introgression
Based on his genetic studies of the Denisova hominin, an ancient human species discovered in 2010, Svante Pääbo claims that ancient human ancestors of the Papuans interbred in Asia with these humans. He has found that people of New Guinea share 4%–7% of their genome with the Denisovans, indicating this exchange.[19] Denisovan introgressions may have influenced the immune system of present-day Papuans and potentially favoured "variants to immune-related phenotypes" and "adaptation to the local environment".[20]
ASPM gene
In a 2005 study of ASPM gene variants, Mekel-Bobrov et al. found that the Papuan people have among the highest rate of the newly evolved ASPM HaplogroupD, at 59.4% occurrence of the approximately 6,000-year-old allele.[21] While it is not yet known exactly what selective advantage is provided by this gene variant, the haplogroupD allele is thought to be positively selected in populations and to confer some substantial advantage that has caused its frequency to rapidly increase.
Notable people
Abba Bina, Papua New Guinean businessman and politician
Torres Strait Islanders between New Guinea and mainland Australia (including the Meriam people, whose language family is otherwise found in New Guinea)
^ abcVallini, Leonardo; Marciani, Giulia; Aneli, Serena; Bortolini, Eugenio; Benazzi, Stefano; Pievani, Telmo; Pagani, Luca (2022-04-10). "Genetics and Material Culture Support Repeated Expansions into Paleolithic Eurasia from a Population Hub Out of Africa". Genome Biology and Evolution. 14 (4). doi:10.1093/gbe/evac045. ISSN1759-6653. PMC9021735. PMID35445261. Taken together with a lower bound of the final settlement of Sahul at 37 kya it is reasonable to describe Papuans as either an almost even mixture between East-Eurasians and a lineage basal to West and East-Eurasians which occurred sometimes between 45 and 38kya, or as a sister lineage of East-Eurasians with or without a minor basal OoA or xOoA contribution. We here chose to parsimoniously describe Papuans as a simple sister group of Tianyuan, cautioning that this may be just one out of six equifinal possibilities.
^崎谷, 満. "DNA・考古・言語の学際研究が示す新・日本列島史 : 日本人集団・日本語の成立史" [New History of the Japanese Archipelago Revealed by Interdisciplinary Research on DNA, Archeology, and Language]. (No Title) (in Japanese).
^Mekel-Bobrov, Nitzan; Gilbert, Sandra L.; Evans, Patrick D.; Vallender, Eric J.; Anderson, Jeffrey R.; Hudson, Richard R.; Tishkoff, Sarah A.; Lahn, Bruce T. (2005-09-09). "Ongoing Adaptive Evolution of ASPM , a Brain Size Determinant in Homo sapiens". Science. 309 (5741): 1720–1722. Bibcode:2005Sci...309.1720M. doi:10.1126/science.1116815. ISSN0036-8075. PMID16151010. S2CID30403575.
