Largest Ever Elephant Genome Study Reveals a Hidden Crisis — and a Path to Better Conservation

The largest ever genomic study of African elephants has revealed how the biological history of these enormous mammals was shaped by their long-distance migrations. The authors say their results also show that restrictions on elephant movements due to habitat loss impact the animals at the genomic level.

“Our study shows that until recently, elephants were connected over large distances. This freedom of movement created genetic robustness because populations mixed. Today the situation is different. Elephants live in a world where space is increasingly restricted and some populations are isolated,” said Patrícia Pečnerová, a geneticist at the University of Copenhagen and Lund University and co-author of the study, in a press release.

An international team published the research in Natural communications.

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Analyzing the elephant genome

For this new research, scientists analyzed 232 elephant genomes. In 2010, scientists first recognized that African elephants comprised two distinct species: the African bush (or savannah) elephant and the African forest elephant, according to a study published in PLOS biology. This new study is the first genomic effort to map the continent’s elephant population since this division was recognized, and it records the genomes of elephants from 17 countries.

The research team analyzed genomes stored more than 30 years ago. This rich source of data has begun to reveal the genomic differences between African elephants. Some animals, like those found between Eritrea and Ethiopia, were physically and genetically isolated. This has led to high rates of inbreeding, increasing the risk of harmful mutations spreading through the population.

Isolation didn’t always cause these problems. Human settlements encircle bush elephants in West Africa. These animals are also inbred but are at lower risk due to contributions from neighboring forest elephant populations, which can interbreed with bush elephants.

However, this cross-breeding could bring its own problems, the authors warn. The two species are genetically distinct; more than 85 percent of the total genetic variation in elephants is attributable to interspecific differences.

“Given this history, gene flow between species is unlikely to be beneficial, and hybrid elephants should be avoided for translocations,” Alfred Roca, a geneticist at the University of Illinois at Urbana-Champaign and co-author of the study, said in the press release.

Guiding more effective elephant conservation

The news is more positive from southern Africa. Here, the vast Kavango-Zambezi Transfrontier Conservation Area, one of the world’s largest nature reserves, provides a safe area of ​​520,000 square kilometers (more than 200,000 square miles) where elephants can travel and exchange genes. As a result, the animals here are genetically diverse.

The authors explained that preserving the landscape and ensuring elephants can move safely across countries and regions is an underappreciated aspect of conservation revealed by the new analysis.

“By identifying distinct population units and levels of gene flow, this research can guide more effective conservation strategies, including habitat management, corridor protection, and translocation decisions. Additionally, the genomic tools and data we generated can support wildlife forensics by helping to trace the origin of confiscated ivory, thereby strengthening efforts to combat the illegal wildlife trade,” said scientists Charles Masembe and Vincent Muwanika. evolutionists at Makerere University in Uganda and co-authors of the study, in the press release.

“By integrating genomics into education and conservation planning, we can better safeguard elephant populations for future generations, ensuring their ecological role and long-term survival in rapidly changing environments,” they conclude in the press release.

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