A recent genomic mapping study, published in the journal Nature Communications, has revealed an alarming reality: the historic continental connectivity of African elephants is vanishing.
Human activity, through hunting, agriculture, and the construction of infrastructure, is fragmenting their habitat and condemning them to genetic isolation.
The impact of habitat fragmentation
For centuries, elephants roamed freely across the continent, allowing for a genetic exchange that ensured their genetic robustness.
Today, the reality is different. According to the analysis of 232 genomes, the herds are becoming confined to small spaces, preventing their natural migration.
Critical areas: the case of Eritrea and Ethiopia
Research detected particularly vulnerable populations in the northeast of Africa. Surrounded by human settlements, these groups exhibit:
-
Inbreeding: Mating between closely related individuals.
-
Low genetic variability: Reduced adaptability.
-
Harmful mutations: Accumulation of genetic defects making them more susceptible to diseases and environmental changes.
Hybridization: a historical survival strategy
The study also explored the relationship between the two species: the savanna elephant and the forest elephant. Through interspecific hybridization, elephants have managed to incorporate genes from one species to another.
In central-western Africa, for example, this genetic mix has helped partially mask the negative effects of isolation and the genetic bottlenecks they have historically suffered.
The model of success: connectivity in the south
Not everything is negative. In southern Africa, specifically in the Kavango-Zambezi Transfrontier Conservation Area, elephants maintain enviable genetic health.
The reason? The landscape allows for the natural flow of herds between protected areas. Experts point out that to ensure the species’ survival, it is not enough to protect individuals; it is imperative to protect landscapes and create ecological corridors that connect the reserves.
A warning for conservation
Researchers emphasize that the intelligence of elephants and their adaptability have a limit.
Without international coordination to halt the disappearance of migratory routes, even the populations we consider “protected” today are at risk of weakening.
As scientists rightly point out, understanding their genomic history is the first essential step to prevent the species from becoming fragmented and irreversibly vulnerable.
