The people of Easter Island built hundreds of monolithic statues called Moai.
Stephanie Morcinek via Unsplash
The widely held claim that the ancient people of Easter Island experienced a social collapse due to overexploitation of natural resources is being called into fresh doubt: analysis of historical agricultural practices suggests that a small, stable population lived sustainably for centuries before Europeans arrived.
Famous for its towering stone statues, Easter Island (also known as Rapa Nui) in the Pacific Ocean is thought to have been inhabited by Polynesians as early as A.D. 1200. At the time, the island’s 164 square kilometers were covered in palm forests, but a combination of rats and over-logging soon destroyed them.
According to a narrative popularized by historian Jared Diamond, unsustainable resource use led to a rapid population growth and collapse before Europeans arrived in 1722.
The islanders made their living primarily from rock gardening, a type of agriculture common in areas with poor soil and harsh climates, by scattering stones throughout the fields to create micro-habitats and windbreaks, conserve moisture, and provide important minerals.
Previous studies have suggested that the rock gardens covered 21 square kilometres of land on Rapa Nui and supported a population of up to 16,000 people.
To learn more, Carl Lipo Researchers from Binghamton University in New York combined satellite imagery and machine learning models trained on ground surveys to generate estimates of rock gardening areas across the island.
They found that the largest rock gardens measured just 0.76 square kilometers. The researchers estimate that such a system could not have supported more than 4,000 people, roughly the estimated population at the time Europeans arrived. In other words, the population was remarkably stable, the team argues.
Robert DiNapoli, a researcher at Binghamton University in New York, inspects the rock garden.
Carl Lipo
Lipo says those who continue to use Easter Island as a case study of degradation and collapse need to see the empirical evidence: “The results we produce suggest that the island was never… [had] “Huge populations overconsumed resources,” he says, “and overall, the archaeological record shows no evidence of population collapse before European arrival.”
Instead, Lipo says, the increasingly popular theory is that the islanders modified their environment to enable sustainable livelihoods for generations: “Their small populations and low-density, dispersed settlement patterns allowed them to reliably produce enough food for over 500 years before Europeans arrived.”
Dale F. Simpson The University of Illinois researchers say further research is needed to assess whether the precision and accuracy of the model calculations used in the study match the archaeological record.
“Overall, this is [study] Rapa Nui [people] “Rapa Nui is often portrayed as a culture that collapsed due to sociopolitical competition, overexploitation of ecosystems, and megalithic overproduction, but the argument is better served by recognizing Rapa Nui as a Polynesian island culture of adaptation and survival that thrived for almost a millennium,” Simpson said.
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