The cost of living in a seal harem

Bœuf, Burney J. Le; Briggs, Kenneth T.

doi:10.1515/mamm.1977.41.2.167

Cited by 138 publications

(90 citation statements)

References 67 publications

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“…The predicted mean number of calves born to a sample of this size (116 x 0.367) would be 42 to 43, suggesting that about 5 to 7% mortality had taken place in the first 2 to 3 months after birth. The perinatal mortality of young of other polygynous pinnipeds evidently varies widely in relation to population density, being as low as 2 to 3% in populations that are still in the rapid growth phase, and as high as 13 to 60% in those near maximum size (Laws 1953b;Kenyon et al 1954;Summers et al 1975;Le Boeuf and Briggs 1977).…”

Section: Survival and Recruitmentmentioning

confidence: 99%

Ecology and Biology of the Pacific Walrus,Odobenus rosmarus divergensIlliger

Fay¹

1982

North American Fauna

387

567

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Section: Survival and Recruitmentmentioning

confidence: 99%

Ecology and Biology of the Pacific Walrus,Odobenus rosmarus divergensIlliger

Fay¹

1982

North American Fauna

387

567

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“…Females form compact pods instead of dispersing randomly over the rookery because males are prone to crush or injure both females and pups during fights Le Boeuf and Briggs, 1977). Central females in a pod are also more likely to be inseminated by a dominant male, thus increasing the genetic quality of their male offspring (McLaren, 1967), and females even incite fights that break up copulation attempts by subordinate males in order to gain this advantage (Cox and Le Boeuf, 1977).…”

Section: Other Mammalsmentioning

confidence: 99%

The Evolution of Mating Systems in Birds and Mammals

Wittenberger

1979

Social Behavior and Communication

153

120

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“…If offspring do not survive, young or small mothers may still gain maternal experience that could enhance the success of future offspring. This may be important in long-lived species such as pinnipeds, where premature separation of mother and pup often resuhs in high pup mortality (Le Boeuf and Briggs 1977;Reiter et al 1981;Boness et al 1992). Like other pinnipeds, harbour seals {Phoca vitulina) are long-lived, iteroparous mammals that begin reproduction while they are still growing.…”

Section: Introductionmentioning

confidence: 99%

The effect of maternal age and other factors on birth mass in the harbour seal

Bowen¹,

Oftedal²,

Boness³

et al. 1994

Can. J. Zool.

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. 1994. The effect of maternal age and other factors on birth mass in the harbour seal. Can. J. . We studied the effects of maternal age, maternal body mass at parturition, year of birth, birth date, P^P «e'c and developmental stage (as indicated by the presence of a foetal pelage called lanugo) on the birth mass of harbour seals (Phoca ;« on Sable Mand. Nova Scotia, Canada. Between 1987 and 1992, mass was obtained on l^^-^'^;i^l^'l^ their mothers. Birth mass was significantly correlated with maternal mass (r = 0.42 for male pups; r = 0.32 for female pups). Among pups that had shed thei? lanugo, males were significantly heavier at birth (11.4 ± 0.09 kg, n = 107 than females (10 9 ± 0 09 n = 99). Birth mass increased significantly with maternal age (« = 71, range 4-12 years) even after the effects of maternal mass and pup sex were statistically removed. Mean birth mass varied significantly among years, from 0.5 to 11 5 kg Newboms averaged 12.8% of maternal mass at parturition (84.8 ± 0.49 kg). Most (84%) pups had shed their lanugo iefore birth Pups born lith extensive lanugo were born earher in the season and weighed about 20% less than pups born without lanugo. These data suggest that pups born with lanugo may be less developed than pups that had shed their foetal coat. Young mothers (4 and 5 years old) produced most of the underweight, lanugo-covered pups.BOWEN, W.D., OFTEDAL, O.T., BONESS, D. J., et IVERSON, S. J. 1994. The effect of maternal age and other factors on birth mass in the harbour seal. Can. J. Zool. 72 : 8-14. Nous avons étudié les effets de l'âge de la mère, de sa masse au moment de la parturition, de l'annexe de la naissance, de la date de la naissance, du sexe du rejeton et du stade de développement (tel qu'indiqué par la presence du pe age fetal appelé lanugo) sur la masse à la naissance chez des Phoques communs (Phoca vitulina) dans 1 île des Sables, Nouvelle-Ecosse Canada Entre 1987 et 1992, la masse a été mesuré chez 330 nouveau-nés et 259 mères. La masse a la naissance était en corrélation significative avec la masse de la mère (rejetons mâles, r = 0,42; rejetons femelles, r = 0'32). Parmi les rejetons qui avaient déjà rejeté leur pelage fétal, les mâles étaient significativement plus lourds à la naissance (11,4 ± 0,09 kg n -107) que les femelles (10 9 ± 0,09, n = 99). La masse à la naissance augmentait significativement en fonction de 1 age de la mère (n = 71, étendue 4-12 ans), même après avoir apporté une correction tenant compte des effets de la masse de la mere et du sexe du rejeton. La mass moyenne à la naissance a varié significativement d'une année à l'autre, de 10,5 a ^ ^-^ ''g La masse des nouveau-nés représentait en moyenne 12,8% de la masse de la mère au moment de la parturition (84 8 ± 0,49 kg). La plupart des rejetons (84%) avaient rejeté leur pelage fétal avant la naissance. Les petits nés avec une couche importante de lanugo naissaient plus tôt dans la saison et leur masse était d'environ 20% inférieure à celle des petits nés sans lanugo. Ces données indiquent que les petit...

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The cost of living in a seal harem

Cited by 138 publications

References 67 publications

Ecology and Biology of the Pacific Walrus,Odobenus rosmarus divergensIlliger

Ecology and Biology of the Pacific Walrus,Odobenus rosmarus divergensIlliger

The Evolution of Mating Systems in Birds and Mammals

The effect of maternal age and other factors on birth mass in the harbour seal

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