AnAge entry for Callorhinus ursinus

Lifespan, ageing, and relevant traits

After fertilization, implantation is delayed for 3.5 to 4 months, making the total gestation period to be approximately 11.75 months [0443]. In the wild, females have been estimated to live more than 30 years [0001], which is possible but unverified. Their longevity in captivity has not been studied in detail but one wild born specimen was about 25.1 years old when it died in captivity [0671].

Life history traits (averages)

Metabolism

References

[0817] Bielby et al. (2007), The fast-slow continuum in mammalian life history: an empirical reevaluation, PubMed
[0671] Richard Weigl (2005), Longevity of Mammals in Captivity; from the Living Collections of the World
[0443] Ronald Nowak (2003), Walker's Marine Mammals of the World
[0610] Ernest (2003), Life history characteristics of placental non-volant mammals
[0434] Ronald Nowak (1999), Walker's Mammals of the World
[0441] William Burt et al. (1998), A Field Guide to Mammals
[0676] Purvis and Harvey (1995), Mammal life-history evolution: a comparative test of Charnov’s model
[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
[0731] Zullinger et al. (1984), Fitting sigmoid equations to mammalian growth curves
[0001] Longevity Records: Life Spans of Mammals, Birds, Amphibians, Reptiles, and Fish

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