This species is currently known from a very narrow elevation range (1,620-1,730 m asl) in Bidoup Nui Ba National Park, Lam Dong Province in Viet Nam. The distribution of this species likely extends to adjacent areas in the Langbian Plateau, including Chu Yang Sin National Park and Phuoc Binh National Park (in Dak Lak and Ninh Thuan Provinces) (Rowley et al. 2011) and its range map includes suitable habitat contiguous with the species' known localities. Further surveys in these areas are warranted to determine its presence there and to extend its known elevation limits. The species' extent of occurrence (EOO) is 214 km². This likely represents three threat-defined locations and thus to current knowledge the population is geographically restricted.
Habitat and Ecology
This species is associated with swampy areas adjacent to fast-flowing rocky streams and rocky seeps adjacent to streams within montane evergreen forest. Despite the only known locality being within a protected area, habitat in the area is being increasingly modified (Le 2011). Calling has been detected in May and June (Rowley et al. unpubl. data), and metamorphs have been seen toward the end of May (Rowley et al. 2011). Eggs and larvae of this species are unknown, however it likely has a free-swimming larval stage like all other Leptolalax species for which larvae are known (J. Rowley pers. comm., February 2015).
Little information is available on the size or trends of this species' population except that its presence had gone undetected at or near the type locality during several surveys prior to its discovery (Le 2011). Only seven individuals were detected during initial May 2008 surveys (Rowley et al. 2011) and only a few individuals have been recorded since (Rowley et al. unpubl. data), possibly because the species is difficult to detect due mostly to its small size, cryptic colouration and behaviour, and quiet call (Rowley et al. unpubl. data). Due to ongoing habitat loss, however, the species' population is suspected to be decreasing. Further surveys are needed to determine its abundance.
The species' elevation restrictions may be quite narrow (Rowley et al. 2011). This may leave it susceptible to restriction of suitable habitat which, in the protected area where it is found, is becoming increasingly modified and fragmented due to anthropogenic processes including the construction of roads, subsistence logging and a salmon farm (Le 2011, J. Rowley pers. comm. February 2014).
This species is currently only known from Bidoup Nui-Ba National Park, and may also occur in adjacent protected areas (Rowley et al. 2011). Further research into the species' ecology, distribution and population trends would improve conservation decisions. Strategies for additional protection of habitat within its range may be warranted.
Red List Status
This species is listed as Endangered due to an estimated extent of occurrence (EOO) of only 214 km² (its area of occupancy is therefore also less than 500 km²), a continuing decline in area and quality of suitable habitat, and a high level of restriction on the species' population (only three threat-defined locations known).
IUCN SSC Amphibian Specialist Group 2015. Leptolalax bidoupensis. The IUCN Red List of Threatened Species 2015: e.T48101579A48101583. http://dx.doi.org/10.2305/IUCN.UK.2015-2.RLTS.T48101579A48101583.en .Downloaded on 14 November 2018