About 27,000 liberated slaves ended up on St. Helena after the British Empire outlawed slave trading in 1807, with the Royal Navy enforcing the ban. St. Helena was used to drop off enslaved people whom the navy had liberated. However, about 8,000 of these newly liberated people, who were malnourished and in poor health, died on the South Atlantic island not long after landing there.
To determine the origins of the liberated slaves, scientists studied the teeth of 152 individuals, measuring the ratio of strontium isotopes, which are atoms of the element strontium that have a different number of neutrons in their nuclei. When a person's teeth grow during childhood, the strontium isotopes in the food they eat and the water they drink are incorporated into their tooth enamel. By studying the unique strontium ratios in a person's enamel, researchers can determine where individuals lived as children.
"Most individuals likely came from coastal or near-coastal regions in western Central Africa, [and] others appear to have originated much farther inland, implying forced displacement over hundreds to thousands of kilometers before embarkation," the team wrote in the study.
It's "possible that their displacement during childhood was connected with their enslavement," study co-author Hannes Schroeder, an associate professor of molecular ecology and evolution at the Globe Institute at the University of Copenhagen, told Live Science in an email. Unfortunately, we don't know much else about this individual, Schroeder said.
Schroeder said it's not clear if any of the people in the study have living descendants on St. Helena but it's unlikely given that these people probably died not long after landing on the island.
"These results are consistent with eyewitness accounts by Royal Navy personnel on the island, who reported multiple languages among the captives, including Congo and Benguela dialects," the team wrote, noting that the findings also align with historical records from Angola, Cuba and Brazil.
The reburial ceremony for the liberated slaves on St. Helena, a remote island in the Atlantic. (Image credit: Photo courtesy of the St Helena Museum)"The tragedy of enslaved children"
"This study is especially impactful because it investigates instances of slavery, where knowledge of individuals' ancestors and descendants have been erased from history," Steven Micheletti, a geneticist who has studied the trans-Atlantic slave trade but was not involved in the new research, told Live Science in an email. However, he said the study would have benefited from analyzing the DNA of more people.
What "seems most interesting to me is the promise of learning about individuals, which is often very hard to do since the slave traders kept the records," and records kept by slave traders tended not to include a lot of information on the lives of their slaves, Head added.
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This is important because "although strontium isotope ratios in human tooth enamel ultimately reflect local geology, they record a biologically available mixture of foods and water consumed while the tooth was forming during childhood," Bentley told Live Science in an email. "So it's rarely a unique geographic fingerprint." It's possible that similar approaches could be used to study the origins of enslaved people in the United States, Bentley added.
The remains were reburied in 2022. The scientists and members of St. Helena's community looked into the possibility of repatriating the remains to countries in Africa where the people came from, but no agreements were reached. In some cases, it would have been difficult to determine which country to return them to, the team noted in their paper.
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