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Chaetodipus fallax

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Taxonomy [top]

Kingdom Phylum Class Order Family
ANIMALIA CHORDATA MAMMALIA RODENTIA HETEROMYIDAE

Scientific Name: Chaetodipus fallax
Species Authority: (Merriam, 1889)
Common Name(s):
English San Diego Pocket Mouse

Assessment Information [top]

Red List Category & Criteria: Least Concern ver 3.1
Year Published: 2008
Date Assessed: 2008-06-30
Assessor(s): Linzey, A.V., Timm, R., Álvarez-Castañeda, S.T., Castro-Arellano, I. & Lacher, T.
Reviewer(s): McKnight, M. (Global Mammal Assessment Team) & Amori, G. (Small Nonvolant Mammal Red List Authority)
Justification:
This species is listed as Least Concern in view of its wide distribution, presumed large population, and because it is unlikely to be declining at nearly the rate required to qualify for listing in a threatened category.

Geographic Range [top]

Range Description: This species is found in Southern California and northern Baja California. It occurs up to 1,835 m. There is one population on Cedros Island (Baja) that was previously known as C. anthonyi.
Countries:
Native:
Mexico (Baja California); United States (California)
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: It is common and widespread (Wilson and Ruff 1999). Populations up to 52 mice/ha have been recorded.
Population Trend: Unknown

Habitat and Ecology [top]

Habitat and Ecology: Occupies shrublands that vary from sparse desert shrublands to dense coastal scrub. Tends to be more abundant where rocks or shrubs provide cover. Lives in a variety of habitats: desert slopes, agave, rocky areas, coastal sage scrub, etc.

It has a diet composed largely of seeds, but insects and plant foliage are also consumed. Like other heteromyid rodents, it is nocturnal, solitary, and seeks shelter in burrows during daylight. Burrow systems can be quite elaborate, consisting of a network of tunnels and chambers. Usually one or two chambers are used as dens for sleeping; the remaining chambers are used for hoarding seeds. Although reproduction can occurs throughout the year, this species breeds mainly during spring. The litter size probably ranges between 2 and 6. Young become sexually mature at 5 to 6 months of age. Females can produce 1 to 3 litters per year. Typical longevity in nature is only 4 to 6 months, but is not usual for some individuals survive 1 to 2 years (Wilson and Ruff 1999).
Systems: Terrestrial

Threats [top]

Major Threat(s): In some parts of its range (San Diego), the species may suffer habitat destruction from expansion of metropolitan areas (Hafner et al. 1998). Populations on Cedros Island, Baja are threatened by predation by feral dogs.

Conservation Actions [top]

Conservation Actions: Subspecies C. f. fallax and C. f. pallidus are federal candidate taxa in the United States and Species of Special Concern in the State of California. On Cedros Island, Baja California this species is considered endangered.

Citation: Linzey, A.V., Timm, R., Álvarez-Castañeda, S.T., Castro-Arellano, I. & Lacher, T. 2008. Chaetodipus fallax. The IUCN Red List of Threatened Species. Version 2014.1. <www.iucnredlist.org>. Downloaded on 23 July 2014.
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