Tanjung Pinang (Morotai) Maternal Lineages

The shores of Morotai sit at the crossroads of maritime Asia — a liminal place where island ecology and long-distance voyaging converge. Archaeological data indicates that the Tanjung Pinang locality in northern Morotai preserves cultural sequences attributed in the regional literature to late prehistoric phases often framed as Neolithic through Early Bronze Age contexts, but the directly dated genetic material reported here spans 752 BCE to 350 CE. This places the sampled individuals well after the initial Austronesian dispersal into Wallacea and into a dynamic era of interaction between incoming farming populations and longstanding Papuan-associated communities.

Limited evidence suggests continuity of island occupation and repeated maritime contacts rather than a single colonizing event. The material culture of the broader North Moluccas — pottery, shell working, and traded obsidian in other sites of Wallacea — evokes networks of exchange that would have shaped population composition. Given the small number of genetic samples (n = 4), interpretations of demographic change should be treated as provisional. Ancient DNA from Tanjung Pinang offers a tantalizing glimpse of how maternal lineages were distributed on a small island within these larger seascapes, but fuller narratives require additional excavation and direct dating of archaeological horizons.

The genetic signal from Tanjung Pinang is based on four individuals whose mitochondrial haplogroups are reported as Q (two individuals, including one Q1) and B (one individual), with one additional Q listed. Maternally, haplogroup Q is strongly associated in the genetic literature with Papuan and Near Oceanian ancestries and is considered an ancient lineage in Sahul and surrounding islands. Haplogroup B (notably sublineages associated with B4a1a and relatives in the wider region) is commonly linked to Austronesian expansions originating from Taiwan and western Island Southeast Asia.

Taken together, the presence of both Q and B maternal lineages at a single locus on Morotai is consistent with a mixed ancestry scenario: deep-rooted Papuan maternal heritage persisting alongside Austronesian-related maternal input. Because Y-chromosome data are not reported for these four samples, male-line dynamics remain unknown. Equally important is the small sample count: with n = 4, frequency estimates are highly uncertain and any inference about population proportions or timing of admixture is preliminary. Archaeogenetic studies elsewhere in Wallacea reveal variable admixture proportions and temporal shifts; thus the Tanjung Pinang results should be read as a local snapshot that complements but does not yet redefine broader regional models. Autosomal ancient genomes and larger sample series will be essential to clarify admixture dates, sex-biased processes, and continuity with modern Moluccan populations.