Re-introduction of Manglietia longipedunculata, an endemic and critically endangered species in China

Summary

Manglietia longipedunculata, a Critically Endangered magnolia relative discovered as a new species in 2004 and known from just one extremely small, narrowly distributed population of 11 mature individuals across roughly 100 km2 of Mt. Nankunshan in Guangdong Province, China, faced near-certain extinction from severe inbreeding risk and a near-total failure to reproduce naturally, since its flowers' single-day stigma receptivity and the near-absence of effective pollinators (only beetles, never bees) left no seedlings ever found beneath mature trees. Funded by Botanic Gardens Conservation International from 2008, the South China Botanical Garden conducted four years of field surveys across three counties alongside pollination biology research, and built a roughly 20-metre bamboo scaffold to reach the canopy for artificial cross-pollination, since the species' height made natural hand-pollination access impossible. This effort collected more than 2 kg of seed and propagated about 3,000 seedlings, establishing a 200-plant ex-situ collection at the botanical garden and reintroducing around 1,000 seedlings into native habitat within Nankunshan Nature Reserve, where reserve staff have since managed and monitored them; by October 2011, average seedling height reached 140 cm, with the tallest at 295 cm. The project paired this with stakeholder workshops and public outreach to build local community awareness and involvement. Difficulties included the population's inability to reproduce naturally, having no prior biological reference data for this newly described species, and the challenge of pollinating very tall trees. The project rates itself successful, crediting close collaboration with local communities who helped record flowering conditions, rigorous species-specific research, and a strong multi-institutional working group.