This species is known from a single locality from Ambovo in Isalo National Park, Madagascar at 996 m Asl (Mercurio and Andreone 2007). It is believed to occur much more widely in the Isalo Massif, both within and outside of protected area boundaries (Andreone et al. 2008, Mercurio et al. 2008). For the purposes of this assessment, it has been mapped to the boundaries of the national park which provides an extent of occurrence (EOO) of 992 km2.
Habitat and Ecology
Several individuals were found inside a narrow canyon (Mercurio and Andreone 2007). Calling males were hanging at night on the almost vertical canyon walls at about 150–200 cm above the bottom or the water surface. Females and males have also been found on the canyon bed inside the water pools. It has also been found in rocky areas within canyons, near cliffs (F. Andreone pers. comm.). Breeding is not known, but it is presumed to be by larval development.
Several individuals were found at the only known locality, but surveys have generally shown this species to be rare (M. Vences pers. comm.). The population trend is unknown.
It is potentially at risk because of its small range and specialised habitat. Sapphire mining is occurring on the outskirts of Isalo National Park and could possibly pose a threat to the habitat of this species (F. Glaw pers. comm. May 2016).
Species in this genus have tested positive for Batrachochytrium dendrobatidis (Bd), however currently there have been no negative effects observed within amphibian populations in Madagascar suggesting the Bd strain has a low virulence level (Bletz et al. 2015).
This species occurs in Isalo National Park.
Research is required on the taxonomy of the numerous candidate species (F. Glaw pers. comm. May 2016) and to determine the extent of the distribution range, and to limit the additional loss of the species' habitat. It is also essential to fully understand the distribution, origin, type and virulence of Bd lineages found in Madagascar (Bletz et al. 2015).
Red List Status
Data Deficient (DD)
Listed as Data Deficient in view of uncertainties as to its distribution, population status (including candidate subpopulations which have not been included in this assessment) and threats.
Candidate species from the subgenus Brygoomantis (see Vieites et al. 2009 and Wollenberg et al. 2011) are not considered in this assessment (F. Glaw pers. comm. May 2016).
IUCN SSC Amphibian Specialist Group 2017. Mantidactylus noralottae. The IUCN Red List of Threatened Species 2017: e.T136048A517327. http://dx.doi.org/10.2305/IUCN.UK.2017-2.RLTS.T136048A517327.en