2026-06-06T20:02:04Zhttps://riubu.ubu.es/oai/request

oai:riubu.ubu.es:10259/114342026-02-26T01:05:52Zcom_10259.4_2532com_10259.4_2477com_10259.4_106com_10259_2604col_10259.4_2533

00925njm 22002777a 4500 dc Arauna, Lara R. author Bergstedt, Jacob author Choin, Jeremy author Mendoza-Revilla, Javier author Harmant, Christine author Roux, Maguelonne author Mas Sandoval, Alex author Lémée, Laure author Colleran, Heidi author François, Alexandre author Valentin, Frédérique author Cassar, Olivier author Gessain, Antoine author Quintana-Murci, Lluis author Patin, Etienne author 2022-11 The Vanuatu archipelago served as a gateway to Remote Oceania during one of the most extensive human migrations to uninhabited lands ∼3,000 years ago. Ancient DNA studies suggest an initial settlement by East Asian-related peoples that was quickly followed by the arrival of Papuan-related populations, leading to a major population turnover. Yet there is uncertainty over the population processes and the sociocultural factors that have shaped the genomic diversity of ni-Vanuatu, who present nowadays among the world’s highest linguistic and cultural diversity. Here, we report new genome-wide data for 1,433 contemporary ni-Vanuatu from 29 different islands, including 287 couples. We find that ni-Vanuatu derive their East Asian- and Papuan-related ancestry from the same source populations and descend from relatively synchronous, sex-biased admixture events that occurred ∼1,700–2,300 years ago, indicating a peopling history common to the whole archipelago. However, East Asian-related ancestry proportions differ markedly across islands, suggesting that the Papuan-related population turnover was geographically uneven. Furthermore, we detect Polynesian ancestry arriving ∼600–1,000 years ago to Central and South Vanuatu in both Polynesian-speaking and non-Polynesian-speaking populations. Last, we provide evidence for a tendency of spouses to carry similar genetic ancestry, when accounting for relatedness avoidance. The signal is not driven by strong genetic effects of specific loci or trait-associated variants, suggesting that it results instead from social assortative mating. Altogether, our findings provide an insight into both the genetic history of ni-Vanuatu populations and how sociocultural processes have shaped the diversity of their genomes. 0960-9822 https://hdl.handle.net/10259/11434 10.1016/j.cub.2022.08.055 Pacific Remote Oceania Vanuatu Lapita Peopling Migrations Admixture Genetics Assortative mating Residence rules The genomic landscape of contemporary western Remote Oceanians