This species is only known from its' type locality in Marojejy National Park in Sava region, northeast Madagascar, at 746 m asl (Scherz et al. 2016). Most species of this genus are microendemic to narrow, altitudinal ranges however this one is less likely to be so, in comparison with other Rhombophryne that occur at higher altitudes, and it is possible that it occurs in other parts of the northern forest chain (Scherz et al. 2016). There is suitable habitat for this species throughout Marojejy National Park, thus for the purposes of this assessment it has been mapped to the park boundaries which has provided an extent of occurrence of 780 km2.
Habitat and Ecology
This species occurs in primary rainforest (Scherz et al. 2016). It was found about 600 m away from degraded forest to the east and 4.9 km in a straight line from the edge of the protected area and forest (Scherz et al. 2016). It is presumed to breed by larval development using foam nests, similar to other species in the genus (M.D. Scherz pers. comm. August 2016).
It is only known from two specimens; one of these is an uncatalogued specimen with the same collection as the holotype, but it could not be examined although the 16S sequence was found to be completely identical to the holotype (Scherz et al. 2016). Due to ongoing decline in the extent and quality of habitat, the population is thought to be decreasing.
Intensive illegal wood extraction of rosewood species within Marojejy National Park that followed the 2009 political crisis of Madagascar caused concerns for the survival of rainforest–restricted species, such as this one. However, while illegal rosewood logging has probably ceased, wood extraction currently taking place in the Park seems to occur at lower elevations; along the boundaries of Marojejy deforestation is taking place to clear land for agriculture (F. Glaw pers. comm. November 2015).
This species occurs in Marojejy National Park (Scherz et al. 2016), although anthropogenic activities continue to threaten the forest within them (Patel and Welch 2013).
Improved protection and management of forests throughout the region is required, including within the boundaries of protected areas.
Further research is required on the ecology of this species and to determine its' full distribution.
Red List Status
Listed as Endangered because its extent of occurrence (EOO) is 780 km2, it occurs in less than five threat-defined location, and there is ongoing decline in the extent and quality of habitat.
IUCN SSC Amphibian Specialist Group 2016. Rhombophryne savaka. The IUCN Red List of Threatened Species 2016: e.T100339944A100339947. http://dx.doi.org/10.2305/IUCN.UK.2016-3.RLTS.T100339944A100339947.en .Downloaded on 15 December 2018