Landmark Elephant Genome Study Warns of Growing Genetic Isolation Across Africa
The largest genomic study of African elephants to date has found that while elephant populations were historically connected across vast continental distances - building genetic robustness through intermingling - increasing habitat fragmentation is now producing measurable genetic consequences for isolated herds. Published in Nature Communications, the study analysed 232 whole genomes from both savanna and forest elephants collected across 17 African countries, using samples biobanked over 30 years ago and processed through Illumina's iConserve programme. Researchers found the most severe genetic deterioration in small, remote populations in Eritrea and Ethiopia, where herds are more than 400 kilometres from other populations and surrounded by human settlements and agricultural land, showing high inbreeding, low genetic variation, and an accumulation of mutations that increase vulnerability to disease and environmental change. West Africa's elephant populations have similarly been reduced and isolated by high human population densities and a long history of the ivory trade.
By contrast, southern Africa's Kavango - Zambezi Transfrontier Conservation Area (KAZA) - spanning 520,000 square kilometres across five countries - demonstrates the positive impact of landscape-level protection, with genetically diverse and well-connected elephant populations. Lead author Assistant Professor Patrícia Pečnerová of the University of Copenhagen said the study shows that "one of the most important forces for elephant evolution is that genes can move between populations," and that protecting landscapes and ecological corridors is as critical as protecting the animals themselves. The research also provides a practical tool for conservation authorities, with DNA tools being developed in partnership with Save the Elephants and San Diego Zoo Wildlife Alliance to monitor wild populations in the field, and genomic data made publicly available to support wildlife forensics, including tracing the origin of confiscated ivory to combat illegal trade.
Source: Phys Org
