LAUSR

Indonesia has amongst the highest primate species richness, and many species are included on the country's protected species list, partially to prevent over‐exploitation. Nevertheless traders continue to sell primates in open wildlife markets especially on the islands of Java and Bali. We surveyed 13 wildlife markets in 2012–2014 and combined our results with previous surveys from 1990–2009 into a 122‐survey dataset with 2,424 records of 17 species. These data showed that the diversity of species in trade decreased over time, shifting from rare rainforest‐dwelling primates traded alongside more widespread species that are not confined to forest to the latter type only. In the 1990s and early 2000s orangutans, gibbons and langurs were commonly traded alongside macaques and slow lorises but in the last decade macaques and slow lorises comprised the bulk of the trade. In 2012–2014 we monitored six wildlife markets in Jakarta, Bandung and Garut (all on Java), and Denpasar (Bali). During 51 surveys we recorded 1,272 primates of eight species. Traders offered long‐tailed macaque (total 1,007 individuals) and three species of slow loris (228 individuals) in five of the six markets, whereas they traded ebony langurs (18 individuals), and pig‐tailed macaques (14 individuals) mostly in Jakarta. Pramuka and Jatinegara markets, both in Jakarta, stood out as important hubs for the primate trade, with a clear shift in importance over time from the former to the latter. Slow lorises, orangutans, gibbons and some langurs are protected under Indonesian law, which prohibits all trade in them; of these protected species, only the slow lorises remained common in trade throughout the 25‐year period. Trade in non‐protected macaques and langurs is subject to strict regulations—which market traders did not follow—making all the market trade in primates that we observed illegal. Trade poses a substantial threat to Indonesian primates, and without enforcement, the sheer volume of trade may mean that species of Least Concern or Near Threatened may rapidly decline. Am. J. Primatol. 79:e22517, 2017. © 2015 Wiley Periodicals, Inc.