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Trade-driven trapping dampens the biodiversity benefits of forest restoration in Southeast Asia

Tropical forest restoration stands to deliver important conservation gains in lowland Southeast Asia, which has suffered some of the world’s highest rates of forest degradation and loss. This promise, however, may be undermined by defaunation driven by ubiquitous wildlife trapping in the region, particularly for forest birds that are part of the multi-million-dollar pet trade. To date, quantification of the impacts of trade-driven trapping on rates of biodiversity recovery from forest restoration has been limited. Here, we use a unique long-term survey dataset to ask how trade-driven trapping may interfere with the expected recovery of avian community under forest restoration, at a flagship ecosystem restoration site in the lowland rainforests of Sumatra, Indonesia. We show that tropical forest restoration is associated with the increases in the abundance of 88% of bird species over time. However, impacts of trapping within more accessible areas of the forest meant that this recovery was dampened for 74% of bird species, relative to levels expected as a result of the magnitude of forest recovery observed. Most species (80%) showed increasingly positive relationships between abundance and site remoteness over the period, a pattern that was found for both species targeted for the pet trade (85% of species) and those trapped opportunistically or as ‘bycatch’ (78% of species). We emphasize the urgency of tackling the emerging threat of pet trade to Southeast Asia’s avian diversity, not least to ensure the effectiveness of efforts towards forest restoration.