Age of Weaning in Two Subspecies of Deer Mice

King, John A.; Deshaies, John C.; Webster, Ronald L.

doi:10.1126/science.139.3554.483

Cited by 34 publications

(39 citation statements)

References 8 publications

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“…Litter-sizes are only approximate, being based on means, modes or medians, usually from small samples. Weaning is a gradual process that has not been precisely defined (except by King et al, 1963), so that estimates of age at weaning (and therefore size of offspring at weaning) depends to a considerable extent on the type of estimate used by the original author. Virtually all of the data on growth of mammals between birth and weaning is based on captive mammals of unknown absolute age, so that variation due to age, season, or the effects of captivity cannot be considered.…”

Section: Methodsmentioning

confidence: 99%

Adaptive Features of Mammalian Reproduction

1977

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Section: Methodsmentioning

confidence: 99%

Adaptive Features of Mammalian Reproduction

1977

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“…Layne (1966) suggested that large neonates, small litters, and protracted development are associated with arid habitats. Glazier (1980) suggested that small litters are associated with low habitat quality (restricted ranges) and King et al (1963) found grassland P. maniculatus to have a younger age at weaning than forest mice.…”

Section: Introductionmentioning

confidence: 99%

Demographic and life cycle characteristics of montane deer mice

Millar¹,

Innes²

1983

Can. J. Zool.

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INNES. 1983. Demographic and life cycle characteristics of montane deer mice. Can. J. Zool. 61: 574-585. Demographic and life cycle characteristics of Peromyscus maniculatus borealis were documented in the wild and in the laboratory. Field studies in the Kananaskis Valley, Alberta, indicated that no mice matured in the summer of their birth, overwintered females produced a maximum of 3 litters each season (average, 1.9), nestling survival was variable (0 to 100%), summer survival of weaned young (average, 0.81 1 2 weeks) was similar to that of summer adults (average, 0.8012 weeks), dispersal rates were low, and winter survival (average, 0.98/semimonthly period) was relatively high. These demographic characteristics are similar to those of other populations in which opportunities for reproduction are limited. Laboratory studies indicated that basic life cycle characteristics such as adult size (20.3 g), litter size (5.2), neonate weights (1.70 g), nestling growth rates (0.34 glday), age at weaning (24.9 days), weight at weaning (9.9 g), and food consumption during lactation (220% of nonbreeding consumption) were not all the same as previously reported for northern P . m. borealis or other Peromyscus. These differences may be related to specific aspects of the annual cycle. MILLAR, J. S., et D. G. L. INNES. 1983. Demographic and life cycle characteristics of montane deer mice. Can. J. Zool. 61:574-585. Les caractkristiques dCmographiques et le cycle biologique ont CtC dCterminCs chez des Peromyscus maniculatus borealis en nature et en laboratoire. Des travaux sur le terrain dans la vallke Kananaskis, Alberta, ont dkmontrC qu'aucune souris n'atteint sa maturitC la Ire annCe, que les femelles qui survivent a l'hiver produisent au maximum trois portCes par saison (moyenne = 1,9), que la survie des jeunes au nid est variable (0,O a loo%), que la survie des jeunes sevrks durant 1'ktC (moyenne 0,8112 semaines) est semblable a celle des adultes durant llktC (moyenne 0,8012 semaines), que les taux de dispersion sont faibles et que la survie au cours de l'hiver (moyenne 0,98/demi-mois) est relativement Clevke. Ces caractCristiques dkmographiques sont semblables a celles d'autres populations dont les chances de reproduction sont 1imitCes. Les Ctudes en laboratoire ont permis d'ktablir que les caractkristiques de base du cycle, telles la masse de l'adulte (20,3 g), le nombre de petits par portCe (5,2), la masse des nouveaux-nCs (1,70 g), les taux de croissance au nid (0,34 g/jour), ]'Age au moment du sevrage (24,9 jours), la masse au moment du sevrage (9,9 g) et la consommation de nourriture durant la lactation (220% de la consommation des individus non reproducteurs) ne sont pas toutes les mcmes c o m e le laissent croire les Ctudes antkrieures sur les P. m. borealis du Nord ou sur d'autres especes de Peromyscus. Ces diffkrences sont peut-ttre reliCes a des aspects particuliers du cycle annuel.[Traduit par le journal]

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“…Excess food available under laboratory condition, but presumably not to wild shrews, permits the former to survive at younger age. If the method of King et al (1963) could be used in study of wild animals it could serve in determinating of the age of full self-dependence in the search for food.…”

Section: Weaningmentioning

confidence: 99%

“…(1963) and their determination of weaning time. The method of King et al (1963) can indicate only one clay in the life of .young animals, while, if weaning is to be regarded as a prolonged process, it should cover several days.…”

Section: Weaningmentioning

confidence: 99%

Growth and postnatal development of the European water shrew

Singleton¹

1987

Acta Theriol.

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Age of Weaning in Two Subspecies of Deer Mice

Cited by 34 publications

References 8 publications

Adaptive Features of Mammalian Reproduction

Adaptive Features of Mammalian Reproduction

Demographic and life cycle characteristics of montane deer mice

Growth and postnatal development of the European water shrew

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