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This IBA comprises Phong Dien proposed nature reserve, which is dominated by a ridge of low mountains extending south-east from the Annamite mountains. The proposed nature reserve, together with the contiguous Dakrong proposed nature reserve, supports the largest remaining area of lowland evergreen forest in the Annamese Lowlands Endemic Bird Area (EBA). Perhaps the species of greatest conservation importance at Phong Dien is Edwards's Pheasant. Until its rediscovery in 1996, this species was believed to be extinct in the wild. Edwards's Pheasant has a very restricted range in central Vietnam, but reports from hunters suggest that this species is still relatively common in the proposed nature reserve.
Rather little information is available about the population of Edwards's Pheasant Lophura edwardsi at Phong Dien but reports from hunters suggest that this species is still relatively common in the proposed nature reserve. Detailed information is also lacking on the status of other key species recorded at the site, such as Annam Partridge Arborophila merlini and Short-tailed Scimitar Babbler Jabouileia danjoui, although the 1998 BirdLife/FIPI survey confirmed that Crested Argus Rheinardia ocellata is still common. In February 2000, an Imperial Pheasant was captured in a forest area adjacent to Phong Dien proposed nature reserve. This globally threatened restricted-range species may also occur within the boundaries of the propsed nature reserve. For these reasons, Phong Dien proposed nature reserve can be considered a key site for the conservation of bird diversity in the Annamese Lowlands EBA.
Non-bird biodiversity: Two recently described mammal species, endemic to Indochina, occur at Phong Dien: Saola Pseudoryx nghetinhensis and Giant Muntjac Megamuntiacus vuquangensis. Rhesus Macaque Macaca mulatta, Stump-tailed Macaque Macaca arctoides, Red-shanked Douc Langur Pygathrix nemaeus nemaeus and White-cheeked Crested Gibbon Nomascus leucogenys (given as Yellow-cheeked Gibbon Hylobates gabriellae in the report) are recorded at Phong Dien. Podocarpus nerifolius is also reported to occur at the site.
BirdLife International (2020) Important Bird Areas factsheet: Phong Dien. Downloaded from http://www.birdlife.org on 28/05/2020.