Geographic Range
The distribution of California pocket mice (
Chaetodipus californicus
) is restricted to the state of California, ranging from San Francisco Bay south to
the border of Baja California, and eastward to the edge of the Central Valley.
C. californicus
is also encountered on the west side of the Central Valley, along the foothills of
the Sierra Nevada. This species is found from the town of Auburn south, and west
across the Tehachapi Mountains to the coast.
Habitat
C. californicus
occupies a wide variety of habitats year-round within its range in the Upper Sonoran
and Transition life zones. These include montane hardwood, valley foothill hardwood-conifer,
valley foothill hardwood, annual grassland, sagebrush, chamise-redshank and montane
chaparral, and coastal scrub.
C. californicus
occurs in greatest abundance in habitats where grassland and chaparral are in close
proximity. In central California, this species is found at low to moderate elevations,
whereas in southern California it is found primarily at moderate elevations. The
species is restricted to high elevations at the southernmost portion of its range
in the Sierra San Pedro Martir, with an overall range in elevation from sea level
to 2400 m.
- Habitat Regions
- temperate
- terrestrial
Physical Description
C. californicus is large for a pocket mouse. Its overall body length is 190-224 mm, with a tail length of 103-143 mm. The tail features a distinctive tuft measuring 9-14 mm. The ears and hind feet, import characters when distinguishing C. californicus from other members of its genus, measure 9-144 mm and 24-29 mm respectively. Overall body coloration is brownish-gray on top, and yellowish-white underneath, with a distinctive brownish line on the side. Conspicuous white, grooved hairs, or spines, are found on the rump. Like the body, the tail is brownish above and light below, with a prominent tuft of hairs at its base. Ears are large for a pocket mouse, with long black or buffy hairs at their base nearly as long as the ear. Hind feet are also large, and their color is yellowish-white. The average weight for this species is 23 g.
The San Diego Pocket Mouse (
C. fallax
) is easily confused with
C. californicus
. Although the two species are largely allopatric, with
C. californicus
to the north and
C. fallax
to the south, some overlap between species ranges can occur in cismontane southern
California. As mentioned above, length of the ears and hind feet are the most reliable
characters for distinguishing between the two species. The ears of
C. fallax
are shorter and rounder, with a length of 7-9 mm and its hind feet, at 21-26 mm,
are slightly smaller than those of
C. californicus
.
- Other Physical Features
- endothermic
- bilateral symmetry
- Sexual Dimorphism
- sexes alike
Reproduction
The mating system of these animals has not been reported.
C. californicus
typically produce one litter a year (occasionally two) between April and July. Litter
size ranges from 2-7, with and average of 4 young. Gestation takes about 25 days,
and young are typically weaned in about three weeks. Females reach reproductive maturity
around the age of 3 months, which is when they reach their adult size. Little other
information is available on the reproductive biology of this species.
- Key Reproductive Features
- iteroparous
- seasonal breeding
- gonochoric/gonochoristic/dioecious (sexes separate)
- sexual
- fertilization
- viviparous
Not much is known about the parental behavior of these animals. Adult females give
birth to their young in burrows dug in soft soil. The young are nursed for approximately
3 weeks. They probably disperse sometime shortly after weaning. No male parental
care has been reported for these animals.
- Parental Investment
- no parental involvement
-
pre-fertilization
-
protecting
- female
-
protecting
-
pre-hatching/birth
-
provisioning
- female
-
protecting
- female
-
provisioning
-
pre-weaning/fledging
-
provisioning
- female
-
protecting
- female
-
provisioning
-
pre-independence
-
provisioning
- female
-
protecting
- female
-
provisioning
Lifespan/Longevity
The longevity of this species has not been reported. However, a congener,
C. fallax
, was reported to have lived an amazing 8 years and 4 months in captivity--an impressive
lifespan for such a small rodent.
Behavior
C. californicus
is nocturnal and aggressively solitary. During the day they remain in their burrow
systems, the entrances of which are plugged with earth to keep the temperature low
and humidity high. The existence of
C. californicus
, like all pocket mouse species, is largely fossorial, with above ground activity
reduced to the essentials of food gathering and reproduction . Above ground forays
are not necessarily local, and movement of adult individuals of up to 850 m in a 24
hour period have been recorded in trapping studies.
On their nightly food gathering expeditions,
C. californicus
endeavor to fill their external, fur-lined pouches with food. When their pockets
are filled, they return to their burrows to cache the contents in small pits along
the passageways.
C. californicus
use their forepaws to push out the contents of their pouches, sometimes turning them
inside out to remove remaining seeds.
In response to hypothermia,
C. californicus
can enter torpor at a variety of ambient temperatures. While this response is common
to all
Chaetodipus
species,
C. californicus
is unique in that arousal is always within 24 hours.
Although these mice are mainly terrestrial and fossorial, they are known to be agile
in climbing tinot small trees and shrubs. They are quadrupedal.
Home Range
Trapping studies suggest an extensive home range of up to 56.74 ha.
Communication and Perception
These mice have a variety of means of communication. Scent marking of the territory
occurs when these animals take dust baths near the periphery of their territories,
depositing some of their odorous secretions (produced by glands at the base of the
tail) in the dirt.
C. californicus
is also known to make an aggressive, tooth-chattering noise, and will growl when
threatened. These animals make a higher-pitched squeal when they are injured or attacked.
Food Habits
C. californicus
is primarily a grainivore, consuming the seeds from annual grasses and forbs. Insects
and leafy vegetation supplement this diet seasonally.
C. californicus
rarely, if ever, drinks water, obtaining its water through moisture stored in seeds
and leafy vegetation. The forefeet of
C. californicus
are equipped with long claws, which are used to sift for seeds buried in soil. The
mice then place the seeds in external cheek pouches.
- Animal Foods
- insects
- Plant Foods
- leaves
- seeds, grains, and nuts
- Foraging Behavior
- stores or caches food
Predation
C. californicus
is preyed upon by a variety of terrestrial and avian predators common in California.
Ecosystem Roles
As small prey items, these animals probably affect populations of their predators. As seed cachers, they likely play some role in distributing seeds. As fossorial animals, they help to aerate the soil.
- Ecosystem Impact
- disperses seeds
- soil aeration
Economic Importance for Humans: Positive
These animals are not known to positively affect humans.
Economic Importance for Humans: Negative
No negative impact on humans has been reported for this species.
Conservation Status
C. californicus
is threatened by habitat loss where human development occurs in its range. Grazing
activity of domestic livestock reduces cover necessary for predator avoidance.
IUCN: A subspecies, C. californicus femoralis (Dalzura pocket mouse), is listed as DD (Data deficient).
Other Comments
Studies indicate that hypothermic
C. californicus
show significantly higher hepatic ATP levels than non-hypothermic control groups.
This suggests a metabolic heat arousal mechanism similar to that used by 13-lined
ground squirrels
Citellus tridecemlineatus
.
Eight subspecies have been described in southern California:
C. californicus bensoni
,
C. californicus bernardinus
,
C. californicus califonicus
,
C. californicus dispar
,
C. californicus femoralis
,
C. californicus mariniensis
,
C. californicus mesopolius
,and
C. californicus ochrus
.
Additional Links
Contributors
Nancy Shefferly (editor), Animal Diversity Web.
Matthew Johnson (author), California State University, Sacramento, James Biardi (editor), California State University, Sacramento.
- Nearctic
-
living in the Nearctic biogeographic province, the northern part of the New World. This includes Greenland, the Canadian Arctic islands, and all of the North American as far south as the highlands of central Mexico.
- native range
-
the area in which the animal is naturally found, the region in which it is endemic.
- temperate
-
that region of the Earth between 23.5 degrees North and 60 degrees North (between the Tropic of Cancer and the Arctic Circle) and between 23.5 degrees South and 60 degrees South (between the Tropic of Capricorn and the Antarctic Circle).
- terrestrial
-
Living on the ground.
- chaparral
-
Found in coastal areas between 30 and 40 degrees latitude, in areas with a Mediterranean climate. Vegetation is dominated by stands of dense, spiny shrubs with tough (hard or waxy) evergreen leaves. May be maintained by periodic fire. In South America it includes the scrub ecotone between forest and paramo.
- forest
-
forest biomes are dominated by trees, otherwise forest biomes can vary widely in amount of precipitation and seasonality.
- iteroparous
-
offspring are produced in more than one group (litters, clutches, etc.) and across multiple seasons (or other periods hospitable to reproduction). Iteroparous animals must, by definition, survive over multiple seasons (or periodic condition changes).
- seasonal breeding
-
breeding is confined to a particular season
- sexual
-
reproduction that includes combining the genetic contribution of two individuals, a male and a female
- fertilization
-
union of egg and spermatozoan
- viviparous
-
reproduction in which fertilization and development take place within the female body and the developing embryo derives nourishment from the female.
- fossorial
-
Referring to a burrowing life-style or behavior, specialized for digging or burrowing.
- nocturnal
-
active during the night
- motile
-
having the capacity to move from one place to another.
- sedentary
-
remains in the same area
- solitary
-
lives alone
- territorial
-
defends an area within the home range, occupied by a single animals or group of animals of the same species and held through overt defense, display, or advertisement
- acoustic
-
uses sound to communicate
- chemical
-
uses smells or other chemicals to communicate
- visual
-
uses sight to communicate
- tactile
-
uses touch to communicate
- acoustic
-
uses sound to communicate
- chemical
-
uses smells or other chemicals to communicate
- stores or caches food
-
places a food item in a special place to be eaten later. Also called "hoarding"
- soil aeration
-
digs and breaks up soil so air and water can get in
- herbivore
-
An animal that eats mainly plants or parts of plants.
- granivore
-
an animal that mainly eats seeds
- endothermic
-
animals that use metabolically generated heat to regulate body temperature independently of ambient temperature. Endothermy is a synapomorphy of the Mammalia, although it may have arisen in a (now extinct) synapsid ancestor; the fossil record does not distinguish these possibilities. Convergent in birds.
- bilateral symmetry
-
having body symmetry such that the animal can be divided in one plane into two mirror-image halves. Animals with bilateral symmetry have dorsal and ventral sides, as well as anterior and posterior ends. Synapomorphy of the Bilateria.
References
Berry, W., E. Berry. 1960. Mammals of the San Francisco Bay Region . Berkely: University of California Press.
Erickson, R., M. Patten. 1999. Identification and Distribution of Spiny Pocket Mice (*Chaetodipus*) in Cismontane Southern California. Bulletin of Southern California Academy of Sciences , 98(2): 57-65.
Ingles, L. 1965. Mammals of the Pacific States . Palo Alto: Stanford University Press.
Merritt, J. 1985. The Effects of Torpor on Adenosine Triphosphate Storage in the California Pocket Mouse, *Perognathus californicus*. Journal of Neurobiology, Biochemistry, and Physiology , 82: 297-299.
Nowak, R. 1999. Walkers Mammals of the World, Sixth Edition . Baltimore: The Johns Hopkins University Press.
Spiegel, L., M. Small, J. Tom, T. Dao. 1995. An iccurrance of long range movement in the California pocketmouse (*Chaetodipus californicus*). The Southwestern Naturalist , 40: 225-226.
Whitaker, Jr., J. 1996. National Audobon Society Field Guide to North American Mammals . New York: Chanticleer Press.
Williams, D. 1999. California Pocket Mouse ( Chaetodipus californicus ). Pp. 508-510 in The Smithsonian Book of North American Mammals . Washington D.C., London: Smithsonian Institution Press.
Zeiner, D., W. Laudenslayer, K. Mayer, E. White, (eds.). 1990. California's Wildlife. Vol. 3, Mammals . Sacramento: California Department of Fish and Game.