Distribution, habitat and status of the new species Nonggang Babbler Stachyris nonggangensis

Abstract

SummaryThe Nonggang Babbler Stachyris nonggangensisis a new species of Timaliidae which was discovered in the Sino-Vietnamese border region in 2008. The species was initially classified as “Near Threatened” on the IUCN Red List and was believed to occur only in Nonggang Nature Reserve, where the type specimen was collected and where c.200 individuals were recorded. These few observations, and suggestions of a declining population, prompted us to initiate an extensive survey over the whole potential distribution range of this species in China from June 2009 to May 2011, during both dry and wet seasons. We conducted the survey in Guangxi Zhuang Autonomous Region and Yunnan Province and selected 19 reserves and forest areas where similar habitat to that in the Nonggang Reserve is known to occur. We used transects combined with playback to survey for this species. Nonggang Babbler was recorded at four new sites in the Sino-Vietnamese border region: two areas of the Nonggang Reserve (Nonggang and Longhu), Bangliang Gibbon Nature Reserve and Chunxiu Nature Reserve. The estimated population size of Nonggang Babbler was about 1,300 individuals in the four sites. Nonggang Babbler is also assumed to occur in the Trung Khanh Gibbon Reserve of Vietnam which adjoins Bangliang Gibbon Reserve. The estimated population in Trung Khanh is c.200 individuals. In total we estimate that the global population size of Nonggang Babbler is c.1,500 individuals. The Nonggang Babbler is restricted to karst forests, and its activities, foraging and nesting strictly rely on this habitat. Habitat loss and fragmentation are the main threats.