New field evidence from South Africa and Cameroon shows that invasive species management in Africa can restore ecosystems, protect endangered wildlife, and improve local livelihoods when communities lead the way.
Invasive species management in Africa is no longer a distant goal. A new case study collection from the International Union for Conservation of Nature (IUCN) documents measurable progress across four conservation projects in South Africa and Cameroon. The findings show that coordinated, on-the-ground action is reversing damage that once seemed permanent.
Invasive alien species (IAS) are plants, animals, or microorganisms introduced outside their natural range by human activity. Once established, they spread rapidly, crowding out native wildlife, disrupting water systems, damaging crops, and raising the risk of wildfires and floods. Research from the Center for Agriculture and Bioscience International (CABI) estimates that IAS costs Africa’s agricultural sector around $3.6 trillion annually, roughly 1.5 times the combined GDP of all African nations. Many African ecosystems host highly specialized species found nowhere else on Earth, so when invasives take hold, native biodiversity can collapse quickly. That makes early detection and rapid response two of the most cost-effective tools available.
Across the four projects, conservation teams restored more than 7,200 hectares of land and freshwater habitats, roughly the size of 10,000 soccer fields. In South Africa’s Klein Swartberg mountains, teams cleared invasive pine trees using controlled ecological burns, restoring natural water flows on slopes choked with alien vegetation. Months later, surveyors discovered previously unknown populations of the rough moss frog, one of the world’s rarest amphibians, which was classified as critically endangered. This outcome shows why invasive species management in Africa must prioritize habitat restoration alongside direct species intervention.
A second South African project focused on the Clanwilliam sandfish, a rare freshwater fish found only in the Olifants River system. Scientists rescued young sandfish from vulnerable river pools, raised them in predator-free environments, and released them back into the wild, buying critical time for a species on the edge.
In Cameroon, dense mats of Salvinia molesta, an invasive aquatic plant, blanketed Lake Ossa, blocking sunlight, depleting oxygen, and cutting off transport routes. They also threatened the habitat of the endangered African manatee. Teams used mechanical removal in combination with a host-specific weevil, a small beetle that feeds only on Salvinia, clearing ~10,000 square meters of water surface and reducing plant coverage by ~20%. Local residents were trained in alternative livelihoods such as mushroom and snail farming, easing economic pressure on the lake and giving communities a direct stake in its recovery.
In Cape Town’s Tokai Park, community volunteers reduced invasive plant cover by up to 26% and replanted nearly 5,000 native seedlings, helping revive a fynbos ecosystem, one of the world’s most biodiverse plant communities, found only in a small coastal region of South Africa. Fynbos supports thousands of plant species, many of which exist nowhere else, and its recovery signals a broader return of ecological health to the area.
One clear lesson runs through every project: no single approach is enough. Effective invasive species management in Africa requires combining prevention, removal, biological control, monitoring, and community involvement. Local communities are not bystanders. They are partners with knowledge, labor, and long-term stakes in the outcome. The IAS currently affects livelihoods in more than 70% of African countries, making sustained funding and cross-border cooperation essential.
The IUCN Save Our Species African Wildlife Initiative (SOS AWI), funded by the European Union since 2017, has directed more than €10.8 million through 91 grants across 34 African countries, supporting positive population trends for more than 30 threatened species. The case study collection is the first of three thematic reports planned for this year, feeding into a major synthesis publication assessing nine years of SOS AWI impact.
Countries worldwide are accelerating action under the Kunming-Montreal Global Biodiversity Framework, a landmark agreement to protect 30% of the planet’s land and water by 2030. These projects offer exactly what policymakers need: a replicable model where global science, local knowledge, and sustained funding combine to protect species and strengthen communities. Where governments, conservation organizations, and local residents align around shared goals, the results speak for themselves. Scaled up, this approach to invasive species management in Africa could set the standard for conservation practice across the continent and beyond.
