Denny and Matisoo-Smith. Rethinking Polynesian Origins - Human Settlement of the Pacific

Rethinking Polynesian Origins Panel: Michal Denny and Lisa Matisoo-Smith

Renowned for being successful navigators; they developed advanced techniques that allowed them to travel vast distances across the Pacific Ocean.
Utilized knowledge of tidal patterns, star constellations, wind and ocean currents for navigation.
Settled nearly every habitable island by the 16th century, prior to the arrival of European explorers, demonstrating remarkable maritime skills and resilience.

Hawaiki is depicted as the legendary homeland from which Māori and other Polynesian people undertook their voyages of exploration and settlement, providing a cultural narrative and connection to their ancestry.
These oral traditions offer insights into the values and beliefs of Polynesian societies.

Recent studies suggest Polynesians reached South America before the arrival of Europeans, indicating broader interactions across vast ocean distances.
Genetic analysis and archaeological findings continue to challenge traditional timelines of migration.

Core questions include: Where did Polynesian ancestors originate? What routes were taken through the Pacific? Understanding ancient migration patterns through genetic, archaeological, and cultural studies.

Focuses on biological anthropology, studying human migration patterns and cultural evolution through both genetic and archaeological evidence.
Lisa Matisoo-Smith’s research emphasizes the origins of Pacific peoples by employing ancient and modern DNA analysis to reveal population histories.

Commences with a literature search on human dispersal and settlement patterns, identifying known migration pathways, anomalies, and gaps.

Migration of anatomically modern humans from Africa occurred approximately 150,000–100,000 years ago, reaching South-East Asia by about 60,000 BP.
Expansion into the Pacific occurred through routes in New Guinea, leading to Australia (around 45,000 BP).
After a pause in migration for 30,000 years, renewed expansion into the Pacific around 3,500 BP saw settlement in Samoa, Tonga, Hawaii, Easter Island, and New Zealand.

Investigate the ancestry of modern Pacific peoples, their geographic origins, and the migration routes through the Pacific that led to current populations.

Emphasis on mitochondrial DNA (mtDNA) and Y chromosome due to their unique inheritance characteristics; they provide valuable information about maternal and paternal lineage.
Variation between populations aids in tracking the migration and genetic lineage of founding populations.

Polynesia is defined by the triangular region encompassing Hawaii, Aotearoa-New Zealand, and Easter Island, each with unique cultural practices.
Regions of the Pacific:
- Near Oceania: Settled by 30,000 BP.
- Remote Oceania: Settled around 3000 BP.

The Lapita culture represented the first settlers of Remote Oceania, known for their distinctive pottery and agricultural practices.
Lapita Culture Characteristics: Pottery first discovered in the Bismarck Archipelago (around 3500 BP); their artifacts indicate a pattern of migration and settlement from west to east into Polynesia.
Archaeological remains bolster the idea that Lapita people are ancestors of modern Pacific populations.

Prior to the 1990s, prevailing theories suggested that Lapita ancestors were the sole population responsible for settling Polynesia.
Evidence taken into consideration includes pottery styles, limited cultural variation, and distinctive Polynesian phenotypes, forming the basis of the Lapita-only model proposed by earlier scientists.

The study of animals like the Pacific rat (Kiore) aids in exploring genetic origins and human involvement in the ecosystem.
Characteristics of Kiore: Transported in canoes and cannot swim, it rapidly reproduces, which is useful in tracing genetic mutations.
A clear association exists between Kiore and Polynesian settlements, as they often arrived alongside the human populations.

Variability in mtDNA allows for mapping lineage connections among Pacific rat populations.
Research findings indicate multiple introductions of Pacific rats to the islands, suggesting later migrations and population exchanges.
Analysis of ancient DNA also assists in identifying patterns of introduction and migration timing.

Distinct haplotype groups in Pacific rats suggest diverse origins and movements into Polynesian islands over time.
Additional studies of pigs and chickens support findings related to human migration and the spread of animal domestication.

Proposal of a new model indicating initial Lapita colonization in West Polynesia, with new populations introduced around 1500 BP that had differing characteristics.
This led to the formation of an Ancestral Polynesian culture that facilitated extensive settlement across Polynesia.

Polynesian populations exhibit low genetic variation due to founder effects, which arise from small initial populations that lead to limited genetic diversity.
The case of Māori settlers supports this notion, with estimates indicating a founding population of merely 50 to 100 women aligning with oral histories.

An initiative aimed at uncovering the history of human migration, utilizing genetic research to elucidate global human ancestry and migrations.
Lisa Matisoo-Smith serves as a Principal Investigator, focusing on the genetic heritage of Pacific Island communities, contributing to broader understanding of human population dynamics and interactions.

Migration of Anatomically Modern Humans: Began approximately 150,000–100,000 years ago, reaching Southeast Asia around 60,000 years ago. The expansion into the Pacific occurred via New Guinea (around 45,000 BP) and a significant migration phase restarted around 3,500 BP, leading to settlements in Samoa, Tonga, Hawaii, Easter Island, and New Zealand.
Lapita Culture: The first settlers of Remote Oceania, noted for their distinctive pottery and agricultural practices. Pottery first identified in the Bismarck Archipelago (around 3500 BP) shows a migration from west to east into Polynesia. Archaeological evidence links Lapita people directly to modern Pacific populations.
Animal and Plant Studies: The Pacific rat (Kiore) played a key role in exploring genetic origins and ecosystem interactions. Found alongside human settlers, Kiore aids in tracing migration patterns through genetic analysis of its mtDNA, which reveals multiple introductions of these animals to island populations.
Genetic Diversity and Founder Effects: Polynesian populations exhibit low genetic variation due to founder effects from small initial populations. The Māori settlers, with an estimated founding population of 50 to 100 women, exemplify this phenomenon. Advances in genetic research, led by the Genographic Project, aim to refine understanding of these migration patterns and the ancestry of Pacific Island communities.