AnAge entry for Urocitellus richardsonii
Classification (HAGRID: 03189)
- Taxonomy
-
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia (Taxon entry)
Order: Rodentia
Family: Sciuridae
Genus: Urocitellus
- Species
- Urocitellus richardsonii
- Common name
- Richardson's ground squirrel
- Synonyms
- Spermophilus richardsonii
Lifespan, ageing, and relevant traits
- Maximum longevity
- Not 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 maturity
- 335 days
- Male sexual maturity
- 335 days
- Gestation
- 24 days
- Weaning
- 36 days
- Litter size
- 6.06 (viviparous)
- Litters per year
- 1
- Inter-litter interval
- Weight at birth
- 6.35 g
- Weight at weaning
- 92.8 g
- Adult weight
- 342.5 g
- Postnatal growth rate
- 0.0559 days-1 (from Gompertz function)
Metabolism
- Typical body temperature
- 309ºK or 35.4ºC or 95.8ºF
- Basal metabolic rate
- 0.7880 W
- Body mass
- 266.3 g
- Metabolic rate per body mass
- 0.002959 W/g
References
- [1143] Nussey et al. (2013), Senescence in natural populations of animals: widespread evidence and its implications for bio-gerontology (PubMed)
- [1032] McNab (2008), An analysis of the factors that influence the level and scaling of mammalian BMR (PubMed)
- [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 System
- ITIS 930322
- Animal Diversity Web
- ADW account (if available)
- Encyclopaedia of Life
- Search EOL
- NCBI Taxonomy
- Taxonomy ID 37591
- Entrez
- Search all databases
- Ageing Literature
- Search Google Scholar or Search PubMed
- Images
- Google Image search
- Internet
- Search Google