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Tracing DNA of related elephants reveals illegal ivory trafficking networks


Researchers used genetic testing on ivory shipments seized by law enforcement and were able to trace the international crime ring shipping the ivory from Africa.

The team tested more than 4,000 elephant tusks from 49 different seizures, made between 2002 and 2019, across 12 different African countries. The findings published Monday in the journal Nature Human Behaviour.

The study establishes familial connections between the elephants that are being poached for their ivory tusks and reveals the poaching and shipping practices and interconnectedness of the traffickers.

This kind of DNA detective work can expose the tactics employed by transnational criminal organizations, believes the research team, comprised of scientists and US Department of Homeland Security special agents. These illicit organizations have operated out of Africa for decades, leading to the heavy decline of thousands of elephants in recent years, according to the study.

“These methods are showing us that a handful of networks are behind a majority of smuggled ivory, and that the connections between these networks are deeper than even our previous research showed,” said lead study author Samuel Wasser, a University of Washington professor of biology and co-executive director of the Center for Environmental Forensic Science, in a statement.

Linking elephant family members

Drawing connections between the separate seizures of ivory made at ports that were thousands of miles apart can create a trail of evidence and strengthen cases against those arrested for poaching and smuggling the tusks.

This study builds on previous work, published by Wasser and his colleagues in 2018, which showed tusks from the same elephant were often separated and smuggled in different shipments before being seized. These identifications linked the trafficking networks that smuggled ivory from three African port cities in Kenya, Uganda and Togo.

The new research broadened the DNA analysis to find elephants that were related in some way, including parents, offspring and siblings. Drawing connections between families of elephants, rather than trying to match individual tusks, helped the researchers understand the scope of the trafficking network.

The three networks established in the 2018 study “are involved with many more seizures and more connected to each other than previously discovered,” according to the new paper.

“If you’re trying to match one tusk to its pair, you have a low chance of a match. But identifying close relatives is going to be a much more common event, and can link more ivory seizures to the same smuggling networks,” Wasser said.

Special Agent John Brown, study coauthor and a criminal investigator with US Homeland Security Investigations, has worked on environmental crime issues for more than 25 years. The forensic analysis in the study can provide “a roadmap for far-reaching multinational collaborative investigations,” Brown said.

Targeted populations

The tusks came from both forest elephants and savannah elephants. Forest elephants represent about 6% of the remaining African elephant population and live in the humid forests of West Africa and the Congo Basin. Based on the tusk data from the seizures, tusks were heavily poached from Gabon and Republic of the Congo.

DNA tests on elephant tusks expose 'three major export cartels operating in Africa'

Savannah elephants roam across the grassy plains and bushlands in West and Central Africa and most of East and Southern Africa. Many of their tusks were poached in Tanzania, northern Mozambique and southern Kenya — including some from the Kavango Zambezi Transfrontier Conservation Area of southern Africa most recently.

Then, the tusks were shipped from ports in different countries. But the fact that the separated tusks were still shipped from the same ports helped the researchers determine there were fewer networks moving mass ivory shipments than previously suspected, Wasser said.

In elephant populations, females tend to remain in the same family group and males don’t move very far even when they emigrate. The genetic connection between the tusks showed how the poachers were targeting specific populations. Dozens of shipments were found to have tight familial connections, some of which spanned years.

“Identifying close relatives indicates that poachers are likely going back to the same populations repeatedly — year after year — and tusks are then acquired and smuggled out of Africa on container ships by the same criminal network,” Wasser said.

“This criminal strategy makes it much harder for authorities to track and seize these shipments because of the immense pressure they are under to move large volumes of containers quickly through ports.”

Holding traffickers accountable

A small group of smuggling networks are the most likely ones responsible for large ivory shipments, which can move mass quantities of tusks on container ships. The genetic data from the tusks linked seizures from the Ivory Coast along the Atlantic Ocean to Mozambique, bordering the Indian Ocean.

“There has been a lot of movement to make the sale of ivory illegal in many countries around the world,” Wasser said. “However, it has not had a great impact on the kinds of trade that we are talking about when we’re getting these big seizures. And when I say a big seizure, it’s a minimum size of a half-ton and that can go up to 10 tons or more.”

The 17-year span of the study also showed how the networks have shifted to different ports over time, moving from Tanzania, Kenya and Uganda to Angola and the Democratic Republic of the Congo.

Criminals are often linked with one ivory shipment seizure, or “one block of physical evidence,” Brown said. But tracking this kind of data could help prosecutors establish links and ensure the criminals are held accountable for everything they’ve done.

“Extinction of species and ecological collapse through wildlife trafficking can have long-lasting, irreversible, catastrophic impacts on our global community as a whole,” Brown said. “So the global effort to combat these illicit crimes is paramount to protecting our environment.”



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