This species is known from around 600m asl at three widely separated localities in western and northern Thailand: Tham Tarn Lot (Chalerm Rattanakosin) National Park in Kanchanaburi Province; Pa-la-u Waterfall in Kaeng Krachan National Park, Hua Hin District, Prachuap Kirikhan Province; and Doi Chiang Dao Mountain, Doi Chiang Dao Wildlife Sanctuary, Chiang Mai Province. The limits of its distributon remain unknown.
Habitat and Ecology
This species is known from near streams and waterfalls in moist lowland evergreen and semi-evergreen forest, where it is presumed to breed by larval development.
No information is currently available.
At Doi Chiang Dao, the main threats to it include encroachment by both permanent and shifting agriculture, and also fire and unsustainable tourism development (including plans for construction of a cable car) leading to habitat degradation. The threats at Kaeng Krachan are similar, but also include illegal logging (Bird Conservation Society of Thailand and BirdLife International 2004).
The only known localities for this species are all within protected areas: Tham Tarn Lot (Chalerm Rattanakosin) National Park, Kaeng Krachan National Park, and Doi Chiang Dao Wildlife Sanctuary. Given that the threats to the habitat of this species are ongoing despite, or in some cases even because of, current management practices, there is a need for significantly improved protected area management and law enforcement.
Simon Stuart 2006. Huia melasma. In: IUCN 2014