|Scientific Name:||Sigmodon alleni|
|Species Authority:||Bailey, 1902|
|Red List Category & Criteria:||Vulnerable A2c+3c+4c 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)|
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:||
|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).|
|Upper elevation limit (metres):||3050|
|Range Map:||Click here to open the map viewer and explore range.|
|Population:||This species has a low average density of between 0.023 and 0.52 individuals per hectare (Vazquez 1997).|
|Current Population Trend:||Decreasing|
|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).
|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:||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 27 May 2016.|
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