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AnAge entry for Halichoerus grypus

Classification (HAGRID: 02571)
TaxonomyKingdom: Animalia
    Phylum: Chordata
        Class: Mammalia (Taxon entry)
            Order: Carnivora
                Family: Phocidae
                    Genus: Halichoerus
SpeciesHalichoerus grypus
Common nameGray seal

Lifespan, ageing, and relevant traits

Maximum longevity42.9 years (captivity)
Sourceref. 671
Sample sizemedium
Data qualityacceptable
Observations

After a 100 days period of delayed implantation, the active gestation lasts 240 days [0443]. In the wild, it has been estimated that females live up to 46 years [0573], which is dubious. Record longevity in captivity is 42.9 years [0671].

Life history traits (averages)

Female sexual maturity1,460 days
Male sexual maturity1,887 days
Gestation240 days
Weaning19 days
Litter size1 (viviparous)
Litters per year0.9
Inter-litter interval365 days
Weight at birth14,000 g
Weight at weaning41,450 g
Adult weight268,000 g
Postnatal growth rate
Maximum longevity residual129 %

Metabolism

No information on metabolism available.

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
[0538] Don Wilson and Sue Ruff (1999), The Smithsonian Book of North American Mammals
[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
[0573] David Macdonald (1985), The Encyclopedia of Mammals

External resources

Integrated Taxonomic Information SystemITIS 180653
Animal Diversity WebADW account
Encyclopedia of LifeSearch EOL
Genome ProjectSearch NCBI
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