Ctenomys rionegrensis 

Scope: Global
Language: English

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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Chordata Mammalia Rodentia Ctenomyidae

Scientific Name: Ctenomys rionegrensis Langguth & Abella, 1970
Taxonomic Source(s): Bidau, C.J. 2015. Family Ctenomyidae Lesson, 1842. In: Patton, J.L., Pardiñas, U.F.J. and D’Elía, G. (eds), Mammals of South America, pp. 818-877. The University of Chicago Press.
Taxonomic Notes: This species is distinct from Ctenomys minutus (Bidau 2015).

Assessment Information [top]

Red List Category & Criteria: Endangered B2ab(i,ii,iii) ver 3.1
Year Published: 2018
Date Assessed: 2017-01-16
Assessor(s): Bidau, C.J.
Reviewer(s): Amori, G.
Contributor(s): Lessa, E., Ojeda, R. & McCay, S.
This species is assessed as Endangered because its area of occupancy (AOO) is less than 500 km², its distribution is severely fragmented, there are only four known populations, and there is continuing decline in the extent and quality of its habitat. It may be locally abundant if habitat is available but habitat is being quickly destroyed.
Previously published Red List assessments:

Geographic Range [top]

Range Description:This species is found in the southeastern part of the Rio Negro department in Uruguay, specifically in between the Rio Negro and Rio Uruguay and the coast of the Rio Uruguay in the Entre Rios province Argentina. In Argentina this species in located in the Entre Rios, Concorsia, Colonia Yeruaa, Paranacito, Parque Nacional El Palmar, Ubajay and Victoria. In Uruguay this species is found in Rion Negro, Arrayanes, Balneario Las Canas, La Guarida, La Tabare and Mafalda (Bidau 2015). It is restricted to sand dunes which make up <10% of the area the species range.
Countries occurrence:
Argentina; Uruguay
Additional data:
Estimated area of occupancy (AOO) - km2:152Continuing decline in area of occupancy (AOO):Yes
Estimated extent of occurrence (EOO) - km2:88280.49
Continuing decline in extent of occurrence (EOO):Yes
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:It is found in four disjunct populations. It may be locally abundant (Lessa pers. comm). This species has undergone recent demographic expansion and population densities are high around 40 adults per hectare (Bidau 2015).
Current Population Trend:Decreasing
Additional data:
Population severely fragmented:Yes

Habitat and Ecology [top]

Habitat and Ecology:This species is found in the sand dunes between Rio Negro and Rio Uruguay in Uruguay and in Argentina (Bidau 2015).
Continuing decline in area, extent and/or quality of habitat:Yes

Threats [top]

Major Threat(s): These sand dunes have been priorities for expansion of pine plantation and Eucalyptus. Many populations of C. rionegrensis have been extirpated because of this (Lessa pers. comm).

Conservation Actions [top]

Conservation Actions: There is no information available about any conservation measures being made to protect this species. Further research is necessary to clarify the true status of this species.

Citation: Bidau, C.J. 2018. Ctenomys rionegrensis. The IUCN Red List of Threatened Species 2018: e.T136635A22193418. . Downloaded on 23 September 2018.
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