|Scientific Name:||Microtus umbrosus Merriam, 1898|
|Red List Category & Criteria:||Endangered B1ab(i,ii,iii)+2ab(i,ii,iii) ver 3.1|
|Assessor(s):||de Grammont, P.C. & Cuarón, A.|
|Reviewer(s):||McKnight, M. (Global Mammal Assessment Team) & Amori, G. (Small Nonvolant Mammal Red List Authority)|
Listed as Endangered because its has a maximum estimated extent of occurrence of less than 5,000 km2, and an estimated area of occupancy of less than 500 km2, its habitat is severely fragmented, and there is a continuing decline in the: extent of occurrence, area of occupancy, and quality of habitat. This species has lost 16-20% of its habitat over the past 10 years.
|Previously published Red List assessments:|
|Range Description:||This species occurs in Cerro Zempoaltépec (1,800 to 3,000 m), north central Oaxaca, México (Musser and Carleton 2005). The distribution of this species is restricted to the area south-east of Rio Cajones, Mixe District, Oaxaca in the two municipalities of Totontepec and Santa Maria Jalapa. |
The total area of occupancy is estimated to be 80 km2 (Frey and Cervantes 1997).
|Range Map:||Click here to open the map viewer and explore range.|
|Population:||This is a relict species with a limited distribution (Frey and Cervantes 1997). No population information could be found.|
|Current Population Trend:||Decreasing|
|Habitat and Ecology:||The habitat of the species has been described as humid Upper Austral Zone, dense oak forest, montane pine-oak forest, evergreen cloud-forest, and evergreen broadleaf rainforest; the habitat where it occurs is humid, with dense oak forest and cleared pastures (Frey and Cervantes 1997). This species is associated with mesic, well-drained soil (Getz 1985 in Frey and Cervantes 1997) It lives in burrows and in long subterranean tunnels (Bailey 1990 in Frey and Cervantes 1997).|
|Major Threat(s):||The habitat of this species is undergoing fragmentation from deforestation across its range. It is estimated to have lost 16-20% of its population based upon habitat change over the past 10 years (Carton de Granmont and Cuaron pers. comm.).|
|Conservation Actions:||This species is listed on the Mexican Red List as subject to special protection, "sujeta a proteccion especial".|
|Citation:||de Grammont, P.C. & Cuarón, A. 2008. Microtus umbrosus. The IUCN Red List of Threatened Species 2008: e.T42635A10737585.Downloaded on 16 December 2017.|
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