Fifth eDNA Survey Boosts Dolphin Conservation in Senegal

Fifth eDNA Survey Boosts Dolphin Conservation in Senegal

In May 2025, following a successful annual boat survey for Atlantic humpback dolphins in the Saloum Delta in February, 2025, the African Aquatic Conservation Fund (AACF) carried out its fifth year of environmental DNA (eDNA) sampling in the Saloum Delta, a critical habitat for the endangered Atlantic humpback dolphin (Sousa teuszii). This work is part of a long-standing partnership with the Smithsonian National Museum of Natural History. 

The activity aimed to detect the presence of Sousa teuszii and other marine mammals through genetic traces left in the water. This innovative, non-invasive method is part of a broader effort to develop integrated monitoring strategies that complement traditional approaches such as photo-identification and passive acoustic monitoring.

Led by AACF’s Lucy Keith-Diagne and Diana Seck, in collaboration with Smithsonian scientists Michael McGowen and Charley Potter, the team collected eDNA samples from strategic locations across northern Saloum Delta, where Sousa teuszii is known to occur.

In addition to field collection, the activity included on-site filtration and preservation of water samples, followed by shipment to the Smithsonian’s molecular lab for detailed genetic analysis.

The survey achieved several important milestones, including:

• Successful collection of eDNA samples from key dolphin habitats
• Strengthening of a multi-year research collaboration between AACF and the Smithsonian
• Continued advancement of a multi-method approach to monitor marine mammal distribution and presence in Senegal’s coastal waters

This fifth round of eDNA sampling marks a significant step forward in the conservation of dolphins, by providing new tools for detection and protection, while minimizing disturbance to the animals and their environment.