Serum corticosterone concentrations in reproductively mature and inhibited deermice (Peromyscus maniculatus bairdii)

Sung, Kuo‐Li Paul; Bradley, Eric L.; Terman, C. Richard

doi:10.1530/jrf.0.0490201

Cited by 15 publications

(4 citation statements)

References 22 publications

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“…Because Terman and his associates (Gardner & Terman, 1970;Terman, 1969) had repeatedly failed to detect an alteration in the adrenal weights of deer mice housed in large groups or in experimental population cages, no index of adrenal function was measured in the present study. However, recent evidence of an elevation in blood corticosterone concentration, notwithstanding the absence of adrenal hypertrophy, in deer mice living in dense laboratory populations (Sung, Bradley, & Terman, 1977) raises the possibility of adrenal involvement in the inhibition of maturation in male deer mice.…”

Section: Discussionmentioning

confidence: 99%

Social inhibition of sexual maturation in male prairie deer mice.

Bediz

Whitsett²

1979

Journal of Comparative and Physiological Psychology

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The sexual maturation of male prairie deer mice (Peromyscus maniculatus bairdii) that were reared with other males was inhibited in comparison with that of males reared in isolation. Inhibition occurred in males reared with nine or four males of the same age, as well as in those housed with one adult male. This phenomenon was observed after several periods of grouping, and consequently at several ages ranging from 5 wk to 4 mo. Females did not retard the sexual development of males. These results indicate that the sexual maturation of individual deer mice is modulated by the specific composition, rather than density, of the local group. Cole (1954), in his analysis of the influence of life-history traits upon population dynamics, found the age at which animals first reproduce to be particularly important. In species having relatively short prereproductive periods, a modest change in the age at first reproduction markedly alters the reproductive potential of a population. This age is not a fixed characteristic of a species, as Cole assumed for the purpose of his illustrative calculations. A number of reports document a delay of sexual maturation in populations at peak density compared with those in which numbers are still increasing (Christian, 1971;Krebs & Myers, 1974). Density-dependent retardation of sexual maturation has been advocated as a major mechanism in the regulation of population growth (Christian, 1971). Laboratory investigations are required in order to determine the nature of this influence of density upon the sexual maturation of individual members of a population. The regulatory influence of conspecificsThis study was submitted by the first author to North Carolina State University in partial fulfillment of the requirements of the master's degree. We are indebted to P.

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Section: Discussionmentioning

confidence: 99%

Social inhibition of sexual maturation in male prairie deer mice.

Bediz

Whitsett²

1979

Journal of Comparative and Physiological Psychology

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“…Ces kchecs dam la reproduction sont considkrks comme conskquences de l'augmentation des interactions sociales. Celles-ci provoquent des rkajustements hormonaux de type rkaction au stress susceptibles de produire des risorptions foetales, des mises-bas prkmaturdes ou des anomalies de croissance chez les jeunes (BALDWIN 1973;EUKER et RIEGLE 1973;HAMBURGH et al 1974;SUNG et a]. 1977;PETRESCU-RAINU et al 1978).…”

Section: Discussionunclassified

Influence du groupement social sur la reproduction de la femelle de Microcebus murinus (Miller, 1777)

Perret¹

2010

Zeitschrift Für Tierpsychologie

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Microcebus murinus is a photoperiod‐dependent polyoestrous seasonal prosimian. In captivity, ♀♀ kept isolated or paired with a ♂ undergo 3 oestruses (April, June, August) during the breeding season. When 2, 3 or 4 pairs are kept together, a 25 % decrease in occurrence of the 2nd and 3rd seasonal oestrus is noticed. Life in social groups induces: — resorption or abortion in about 50 % of grouped ♀♀, — a high infant mortality (50 % of newborn young), — a significant modification of sex ratio (excess of ♂♂). Finally, the body weight gain is significantly reduced during the first two months of life in offspring of grouped ♀♀.

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“…Similar inconsistencies occur in the effect of density on reproductive organs (Christian, 1955;Southwick & Bland, 1959;Thiessen, 1964). In Terman's work cited above, no relationship was found between density in the cages and weights of reproductive organs or levels of progesterone or corticosterone (Albertson, Bradley, & Terman, 1975;Sung, Bradley, & Terman 1977;Terman, 1973).…”

Section: Relationship To Densitymentioning

confidence: 91%

Reconciling apparent differences between the responses of humans and other animals to crowding.

Freedman¹

1979

Psychological Review

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Psychologists have generally assumed that high density has negative effects on nonhuman animals. This assumption has presented a problem because it appears to be inconsistent with the findings of research involving human responses to density. However, recent research by biologists as well as information gained through careful reading of earlier research, indicates that this original assumption is incorrect. In this article, research on nonhuman animals is reviewed in order to show that there is no discontinuity between humans and other animals. For both, high density is not necessarily harmful. Rather, the effect of high density depends on other factors in the situation.

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Serum corticosterone concentrations in reproductively mature and inhibited deermice (Peromyscus maniculatus bairdii)

Abstract: Summary. Serum

Cited by 15 publications

References 22 publications

Social inhibition of sexual maturation in male prairie deer mice.

Social inhibition of sexual maturation in male prairie deer mice.

Influence du groupement social sur la reproduction de la femelle de Microcebus murinus (Miller, 1777)

Reconciling apparent differences between the responses of humans and other animals to crowding.

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