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AnAge entry for Spermophilus richardsonii

Classification (HAGRID: 03501)
TaxonomyKingdom: Animalia
    Phylum: Chordata
        Class: Mammalia (Taxon entry)
            Order: Rodentia
                Family: Sciuridae
                    Genus: Spermophilus
SpeciesSpermophilus richardsonii
Common nameRichardson's ground squirrel

Lifespan, ageing, and relevant traits

Maximum longevityNot yet established
Observations

They are sexually mature at emergence from their first hibernation. In the wild, females have been known to live more than 6 years, though males do not appear to live more than 4 years [0634].

Life history traits (averages)

Female sexual maturity335 days
Male sexual maturity335 days
Gestation24 days
Weaning36 days
Litter size6.06 (viviparous)
Litters per year1
Inter-litter interval
Weight at birth6.35 g
Weight at weaning92.8 g
Adult weight342.5 g
Postnatal growth rate0.0559 days-1 (from Gompertz function)

Metabolism

Typical body temperatureNot yet available
Basal metabolic rate0.7880 W
Body mass266.3 g
Metabolic rate per body mass0.002959 W/g

References
[0036] Savage et al. (2004), The predominance of quarter-power scaling in biology
[0610] Ernest (2003), Life history characteristics of placental non-volant mammals
[0434] Ronald Nowak (1999), Walker's Mammals of the World
[0455] Virginia Hayssen et al. (1993), Asdell's Patterns of Mammalian Reproduction: A Compendium of Species-Specific Data
[0680] Wootton (1987), The effects of body mass, phylogeny, habitat, and trophic level on mammalian age at first reproduction
[0634] Michener and Koeppl (1985), Spermophilus richardsonii
[0731] Zullinger et al. (1984), Fitting sigmoid equations to mammalian growth curves

External resources

Integrated Taxonomic Information SystemITIS 180157
Animal Diversity WebADW account
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