Atelopus nanay 

Scope: Global
Language: English

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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Chordata Amphibia Anura Bufonidae

Scientific Name: Atelopus nanay Coloma, 2002
Taxonomic Source(s): Frost, D.R. 2014. Amphibian Species of the World: an Online Reference. Version 6 (27 January 2014). New York, USA. Available at: (Accessed: 27 January 2014).

Assessment Information [top]

Red List Category & Criteria: Critically Endangered B1ab(iii,v) ver 3.1
Year Published: 2018
Date Assessed: 2016-07-19
Assessor(s): IUCN SSC Amphibian Specialist Group
Reviewer(s): Neam, K.
Contributor(s): Brito, J., Sánchez, J., Coloma, L.A., Bustamante, M.R., Szekely, P., Betancourt, R., Ron, S.R. & Lötters, S.
Facilitator/Compiler(s): NatureServe
Listed as Critically Endangered because it has not recuperated from the extreme decline caused by chytridiomycosis in the late 1980s, it has an extent of occurrence (EOO) of approximately 86 km2, it is found in one single location where there is continuing decline in extent and quality of habitat due to extension of agricultural land, and a declining number of mature individuals due to introduced trout. Furthermore, a road is planned to be built directly through its range which is expected to cause additional degradation to this species' habitat.
Previously published Red List assessments:

Geographic Range [top]

Range Description:This species is known only from páramo habitats near Laguna Toreadora, Cajas National Park and Patul, in the Cordillera Occidental, in Azuay Province, Ecuador (Coloma 2002) at around 4,000 m asl.
Countries occurrence:
Additional data:
Number of Locations:1
Lower elevation limit (metres):4000
Upper elevation limit (metres):4000
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:As of the 2004 assessment, the species had not been recorded since July 1989 despite surveys within its range, suggesting a serious population decline. Infrequent efforts to find this species at Páramo del Cajas (nine visits between 1991 and 2007) yielded no specimens (Ron et al. 2011). However, one individual was sighted in 2007 and seven females were found in March–May 2008 at Patul (E. Arbelaez pers. comm. In: Ron et al. 2011). The species was last reported in 2014 in Patul (C. Korfel pers. obs. In: Ron et al. 2010), Azuay province. Due to ongoing decline in the extent and quality of habitat the population is suspected to be decreasing, and there is continuing decline in the number of mature individuals due to predation by introduced trout.
Current Population Trend:Decreasing
Additional data:
Continuing decline of mature individuals:Yes
Population severely fragmented:No

Habitat and Ecology [top]

Habitat and Ecology:This species is an inhabitant of herbaceous páramo. Some specimens have been found active close to streams and springs in an area of many interconnected pools, while others have been found on land under rocks and in dense vegetation (E. Arbeláez unpubl. data In: Ron et al. 2010, Coloma 2002). There is no specific information available on its breeding habits, but it is likely to be similar to other Atelopus species, with breeding and larval development taking place in streams.
Systems:Terrestrial; Freshwater
Continuing decline in area, extent and/or quality of habitat:Yes
Movement patterns:Not a Migrant

Use and Trade [top]

Use and Trade: There are no records of this species being utilized.

Threats [top]

Major Threat(s): In the past the species suffered a large population reduction due to chytridiomycosis (Ecuador Red List Assessment Workshop July 2016). Of nine museum specimens tested for Batrachochytrium dendrobatidis, all tested positive for the fungus (Manzano-Pasquel 2014). At present, predation by trout (Martín-Torrijos et al. 2016) and cattle grazing are considered to be the major threats throughout its range. A road is projected to be built in the middle of the species' range and it is expected to negatively affect its habitat and population (J.C. Sánchez, J. Brito, R. Betancourt and P. Szekely pers. comm. July 2016).

Conservation Actions [top]

Conservation Actions: Conservation Actions
The type locality of the species is within Parque Nacional Cajas. Individuals found since 2008 have been brought to captivity by two institutions (Amaru Zoo and 'Balsa de los Sapos' at Museo de Zoología de la Pontificia Universidad Católica del Ecuador) as part of ex situ conservation efforts (Cano and Rodríguez 2008, Ron et al. 2011, J.C. Sánchez, J. Brito, and R. Betancourt pers. comm. 2016).

Conservation Needed
Improved management is needed to mitigate predation rates by invasive trout on this species.

Research Needed
Further survey and monitoring work is required to determine the population trend and status in the wild.

Citation: IUCN SSC Amphibian Specialist Group. 2018. Atelopus nanay. The IUCN Red List of Threatened Species 2018: e.T54532A98642265. . Downloaded on 24 September 2018.
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