Female competition and reproductive success in northern elephant seals

@article{Reiter1981FemaleCA,
  title={Female competition and reproductive success in northern elephant seals},
  author={J. Reiter and Kathy J. Panken and B. L. Boeuf},
  journal={Animal Behaviour},
  year={1981},
  volume={29},
  pages={670-687}
}
The probability of weaning a healthy pup increases with age in female northern elephant seals, Mirounga angustirostris. On Ano Nuevo Island, California, weaning success among ‘prime’ females, those 6 years of age or older, was more than double that of ‘young’ females, those 3 to 5 years old. Prime females were better mothers than young females because of superior size, higher social dominance, and greater maternal experience; they were more likely to mate with high-ranking males and gave birth… Expand
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Models based on the data show that differential survival of seals that vary in age at primiparity has important consequences for population growth and life history strategies. Expand
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It is concluded that the reduced maternal performance is likely the result of the increased male harassment in the grey seal, as reduced weaning mass can lead to reduced juvenile survival and male harassment may have contributed to the enhanced reproductive synchrony in this species. Expand
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Equal investment in male and female offspring in southern elephant seals
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Mother-pup separation and adoption in northern elephant seals
TLDR
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References

SHOWING 1-10 OF 61 REFERENCES
Aggression in the female northern elephant seal, mirounga angustirostris.
TLDR
Maternal aggressive behavior of northern elephant seals enhances reproductive success by increasing the likelihood of pup survival and correlated negatively with the number of times the pup was bitten by alien females. Expand
Male-male Competition and Reproductive Success in Elephant Seals
Male-male competition and reproductive success of northern elephant seals, Mirounga augustirostris , was studied for six consecutive breeding seasons at Ano Nuevo Island, California. The conclusionsExpand
Sexual behavior in the Northern Elephant seal Mirounga angustirostris.
TLDR
The mating behavior of Northern elephant seals was studied during the I968, I969 and I970 breeding seasons at Ano Nuevo Island, I9 miles north of Santa Cruz, California and the greatest difference in the copulatory pattern of the elephant seal, a true seal, and members of the sea lion family is that the former interfere with the copulations of other males while the latter do not. Expand
Perinatal behavior of northern elephant seal females and their young.
TLDR
Various aspects of the reproductive process in northern elephant seals, Mirounga angustirostris, particularly maternal behavior and the interaction of adult females and pups in the harem during the breeding season are described. Expand
Elephant seals on the Farallones: population structure of an incipient breeding colony.
The colonization of Southeast Farallon Island, California, by northern elephant seals, Mirounga angustirostris , began in 1959 with the appearance of a single animal. By 1971, over 100 juveniles wereExpand
Studies on the southern elephant seal, Mirounga leonina (L.). IV. Breeding and development
TLDR
Pressures within this population that is at its natural limit, operating among females as well as males, retard development and breeding, and the effects of continuous sealing at South Georgia may have resulted in a population still below its potential size. Expand
Social Status and Mating Activity in Elephant Seals
TLDR
Individually marked male elephant seals, Mirounga angustirostris, observed on an island off central California participate in a social hierarchy resembling the peck order of domestic chickens, the higher the status of a male, the more readily he approaches and copulates with females. Expand
FACTORS AFFECTING THE AGE OF FIRST BREEDING OF THE KITTIWAKE RISSA TRIDACTYLA
TLDR
A model is proposed whereby the age at which a bird starts to breed, the nesting site which it obtains, and its subsequent breeding strategy result in each individual producing an optimal number of reproducing offspring in its lifetime, relative to its quality. Expand
Variation in the Secondary Sex-Ratio of the Grey Seal Halichoerus grypus (Fab.) during the Breeding Season
TLDR
Of 1,433 calves which were tagged, sexed and aged between 1952 and 1959 inclusive, 731 were males and the remaining 702 females ; a result which does not differ significantly from a 1 : 1 sex-ratio and which confirms Hewer's findings. Expand
Elephant seals breeding on the mainland in California
lUlSTRACT: A northern elephant seal gave birth on the mainland at Ano Nuevo Point, California, in 1975, the rust mainland birth for this species in this century. Seven females gave birth in 1976 andExpand
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