This species is known only from the central hilly regions of Borneo, below 500 m asl. It is likely to occur more widely than currently recorded.
Habitat and Ecology
This species inhabits the banks of clear, rocky streams in hilly lowland primary and secondary rainforest. Juveniles and adults do not disperse from the immediate vicinity of such streams and the larvae develop in pools along those streams. It is not likely to tolerate habitat disturbance (Y.M. Pui and I. Das pers. comm. March 2018).
It is considered to be locally abundant in Kalimantan. In Sarawak, it is considered to be rare (I. Das and Y.M. Pui pers. comm. March 2018). Due to ongoing decline in the extent and quality of habitat and off-take from the wild, the population is suspected to be decreasing.
The principal threat to the species in Kalimantan is rapid clear-cutting of lowland tropical rainforest in forest concession land and for oil palm plantations (Indonesia Red List Assessment Workshop May 2017). In Sarawak, the lowland forest range of this species outside of protected areas is threatened by logging concessions, small scale subsistence logging, and oil palm plantations (I. Das and Y.M. Pui pers. comm. March 2018). As it is quite large, local people often hunt this species for food, and its long life cycle and small clutch size make it particularly vulnerable to over-harvesting.
In Kalimantan it occurs in Betung Kerihun National Park, Bukit Baka Bukit Raya National Park, Gunung Poteng - Raya Pasi Nature Reserve, Beratus Protection Forest, Meratus Protection Forest, and several forest concession areas in Central and East Kalimantan provinces (Indonesia Red List Assessment Workshop May 2017). In Sarawak, it is known from Gunung Mulu National Park and Pelagus National Park (I. Das and Y.M. Pui pers. comm. March 2018).
Effective preservation of lowland forest is needed to conserve this species because oil palm plantations are encroaching into protected areas in Kalimantan (Indonesia Red List Assessment Workshop May 2017). Some oil palm companies and forestry companies designate High Conservation Value areas, which is required by some financial institutions providing loans. However, not all lenders require these areas to be set aside and the habitat within the HCVs could disappear if the lender or requirements change (Indonesia Red List Assessment Workshop May 2017).
Further work is required to improve the understanding of the species' population size, distribution and trends.
Red List Status
Near Threatened (NT)
Listed as Least Concern in view of its wide distribution and presumed large population.
IUCN SSC Amphibian Specialist Group 2018. Limnonectes ibanorum. The IUCN Red List of Threatened Species 2018: e.T58340A114921100. http://dx.doi.org/10.2305/IUCN.UK.2018-1.RLTS.T58340A114921100.en .Downloaded on 12 December 2018