This species is known from across Sabah (Malaysia), central Sarawak (Malaysia), and western and north-eastern Kalimantan (Indonesia) in Borneo, from 750-980m asl. It probably occurs more widely than current records suggest.
Habitat and Ecology
This species is confined to primary and old secondary hilly rainforests, where it lives in the vegetation lining the banks of small, clear, rocky streams. Foam nests are placed in branches overhanging these streams and the larvae live in the rocky bottoms of riffles.
In some areas it appears to be locally abundant.
The major threats to this species are deforestation through clear-cutting and the resulting stream siltation (which deprives larvae of feeding sites).
It is present in many protected areas. Preservation of lowland forest is the main conservation measure required for this species.
Red List Status
Near Threatened (NT)
Listed as Near Threatened since although this species is still relatively widely distributed, it depends on streams in areas of undisturbed forest habitat, and so its Area of Occupancy is probably not much greater than 2,000 km2, and the extent and quality of its habitat is declining very rapidly due to widespread forest loss within its range, thus making the species close to qualifying for Vulnerable.
Robert Inger, Djoko Iskandar, Indraneil Das, Robert Stuebing, Maklarin Lakim, Paul Yambun, Mumpuni 2004. Rhacophorus gauni. The IUCN Red List of Threatened Species 2004: e.T58995A11857182. http://dx.doi.org/10.2305/IUCN.UK.2004.RLTS.T58995A11857182.en .Downloaded on 19 January 2019