Sigmodon alleni 

Scope: Global
Language: English

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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Chordata Mammalia Rodentia Cricetidae

Scientific Name: Sigmodon alleni Bailey, 1902
Common Name(s):
English Allen's Cotton Rat

Assessment Information [top]

Red List Category & Criteria: Vulnerable A2c+3c+4c ver 3.1
Year Published: 2008
Date Assessed: 2008-06-30
Assessor(s): de Grammont, P.C. & Cuarón, A.
Reviewer(s): McKnight, M. (Global Mammal Assessment Team) & Amori, G. (Small Nonvolant Mammal Red List Authority)
This species is listed as Vulnerable because it has experienced estimated population decline of 30%, inferred from habitat conversion, in the past 10 years. The rate of habitat loss is increasing across its range and projected habitat loss is greater than 30% for the next 10 years.
Previously published Red List assessments:

Geographic Range [top]

Range Description:This species occurs in western México, from south Sinaloa to south Oaxaca (Musser and Carleton 2005). It has an altitudinal range from sea level to 3,050 m (Shump and Baker 1978).
Countries occurrence:
Additional data:
Upper elevation limit (metres):3050
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:This species has a low average density of between 0.023 and 0.52 individuals per hectare (Vazquez 1997).
Current Population Trend:Decreasing
Additional data:
Population severely fragmented:No

Habitat and Ecology [top]

Habitat and Ecology:This species prefers moist slopes covered with vines and shrubs in tropical or mixed tropical-boreal regions, including tropical deciduous forest and humid pine-oak forest.

Runways of this cotton rat are evident in thick grassy areas but are indistinct in brushy areas with little ground cover. This species constructs grass nests in a variety of places, including rotten pine logs, beneath volcano rocks, under piles of bark, and in grass-shrub clumps. In laboratory-raised animals, female produced offspring at 87 days and would have mated about 35 days earlier (Baker 1969 in Shump and Baker 1978).

Threats [top]

Major Threat(s): This species is experiencing deforestation for agriculture in many parts of its range. It is estimated to have lost at least 30% of its population based upon habitat change over the past 10 years (Carton de Granmont and Cuaron pers. comm.). The rate of deforestation is increasing across its range.

Conservation Actions [top]

Conservation Actions: It is found in Cerro de Matatlan Biosphere Reserve and Chamela-Cuixmala Biosphere Reserve.

Citation: de Grammont, P.C. & Cuarón, A. 2008. Sigmodon alleni. The IUCN Red List of Threatened Species 2008: e.T20209A9178285. . Downloaded on 16 August 2018.
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