Microtus umbrosus

Taxonomy

Assessment Information

Geographic Range

Population

Habitat and Ecology

Threats

Conservation Actions

Taxonomy [top]

Kingdom	Phylum	Class	Order	Family
ANIMALIA	CHORDATA	MAMMALIA	RODENTIA	CRICETIDAE

Scientific Name:

Microtus umbrosus

Species Authority

Merriam, 1898

Common Name/s:

English

–

Zempoaltepec Vole

Assessment Information [top]

Red List Category & Criteria:

Endangered B1ab(i,ii,iii)+2ab(i,ii,iii) ver 3.1

Year Assessed:

2008

Assessor/s

de Grammont, P.C. & Cuarón, A.

Evaluator/s:

McKnight, M. (Global Mammal Assessment Team) & Amori, G. (Small Nonvolant Mammal Red List Authority)

Justification:
Listed as Endangered because its has an 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.

History:

1996

–

Lower Risk/least concern (Baillie and Groombridge 1996)

Geographic Range [top]

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).
Countries:	Native: Mexico
Range Map:	(click map to view full version)

Population [top]

Population:	This is a relict species with a limited distribution (Frey and Cervantes 1997). No population information could be found.
Population Trend:	Decreasing

Habitat and Ecology [top]

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).
Systems:	Terrestrial

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).

Systems:

Terrestrial

Threats [top]

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.).

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 [top]

Conservation Actions:	This species is listed on the Mexican Red List as subject to special protection, "sujeta a proteccion especial".

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. In: IUCN 2008. 2008 IUCN Red List of Threatened Species. <www.iucnredlist.org>. Downloaded on 20 November 2008.
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