Conservation of the toromiro tree: Case study in the management of a plant extinct in the wild

We reviewed the history and conservation of Sophora toromiro, a species that has been extinct in the wild since 1960 but has survived as scattered individuals in botanic gardens and private collections. The short-term conservation of S. toromiro is dependent on the management of surviving ex situ stocks. Ibis is being achieved through international collaboration by a working group established to coordinate the conservation management of the species. Molecular evidence indicates that the species retains greater genetic variability than expected. The greatest amount of genetic variability was located in specimens outside botanic garden collections. No unmodified natural habitat survives on Rapa Nui (Easter Island); so opportunities to establish a viable wild population are limited. Evidence from past reintroductions indicates that the best shortterm opportunity for the species is through conventional horticultural management in botanic gardens and traditional farm plots on Rapa Nui. Some extinct-in-the-wild taxa (sensu World Conservation Union 1994), such as the Toromiro, retain genetic variability and appropriate reintroduction sites exist These taxa represent valid priorities for conservation management.