Declines of ebony and ivory are inextricably linked in an African rainforest

Vincent Deblauwe Matthew Scott Luskin, Serge Désiré Assola, Olivier J. Hardy, Simon Jansen, Céline Loubières , Gaston Guy Mempong, Jean Mathurin Ntsihe, Gilbert Oum Ndjock [...] , and Thomas B. Smith

Forest elephants in Dzanga-Sangha National Park, Central Africa Republic, by Richard Rosomoff

Critically endangered African forest elephants preferentially eat fruits and disperse seeds of carbon-dense trees, including the highly valued and threatened African ebony. The illegal ivory trade has led to severe declines in elephant populations, but the long-term impacts on tree species are poorly understood. Using a comprehensive dataset including age-class, spatial, genetic, and experimental data, across a hunting pressure gradient, we show how paired declines in elephant and ebony populations are linked by a previously unrecognized mutualism in which elephant dung protects ebony seeds against seed predators. Disruption of this mutualism by poaching exacerbates seed predation by herbivores and was associated with a 68% reduction in small sapling recruitment. This threat to the survival of a valuable and iconic tree species raises concerns about the far-reaching consequences of forest elephant extermination.

DOI: DOI: 10.1126/sciadv.ady4392

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Year Published: 2025