Nancy Gail Solomon

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Prairie vole (Microtus ochrogaster) family groups were examined to determine possible indirect fitness benefits from the presence of juvenile helpers at the natal nest. The reproductive performance of family groups retaining two juveniles was compared with that of families in which all juveniles were removed when the subsequent litter was born. Litter sizes(More)
Integrative studies of genetics, neurobiology and behaviour indicate that polymorphism in specific genes contributes to variation observed in some complex social behaviours. The neuropeptide arginine vasopressin plays an important role in the regulation of a variety of social behaviours, including social attachment of males to females, through its action on(More)
Social interactions are central to most animals and have a fundamental impact upon the phenotype of an individual. Social behavior (social interactions among conspecifics) represents a central challenge to the integration of the functional and mechanistic bases of complex behavior. Traditionally, studies of proximate and ultimate elements of social behavior(More)
Communal rearing of offspring may help mothers maximize their investment in offspring at a reduced cost to their own bodily condition, thus maximizing their potential for reproductive success. The objective of this study was to quantify the costs and benefits of communal rearing to prairie vole (Microtus ochrogaster) pups and mothers. Mothers were assigned(More)
We tested the hypothesis that the presence of an opposite-sex conspecific will result in time-related changes in measures of reproductive activation. We housed male-female pairs of pine voles together for 0, 2, 6, 12, or 24 h before collecting blood, reproductive organs and brains for immunocytochemical analysis of LHRH and c-fos. Control animals were never(More)
11 Breeding in Mamma/s (Solomon, N.G. and French, J.A., eds), Cambridge University Press (in press) Fitzgerald, R.W. and Madison, D.M. (1983) Behav. Ecol. Sociobiol. 13, 183-187 Powell, R.A. and Fried, J.J. (1992) Behav. Ecol. 3, 325-333 Cornblower, T.R. and Kirkland, G.L., Jr (1983) Proc. Penn. Acad. Sci. 57,147-154 Sherman, P.W., Lacey, E.A., Reeve, H.K.(More)
Recent discoveries of single-gene influences on social behaviour have generated a great deal of interest in the proximate mechanisms underlying the expression of complex behaviours. Length polymorphism in a microsatellite in the regulatory region of the gene encoding the vasopressin 1a receptor (avpr1a) has been associated with both inter- and(More)
Among various arvicoline rodents, reproduction is influenced to varying degrees by social factors, including behavioral or chemical cues. Since previous research suggested that chemosignals from adult males reproductively activate female pine voles (Microtus pine-torum), we sought to determine specifically what types of stimuli promote the activation(More)
Olfactory cues from conspecifics have strong influences on behavior. Both female and male juveniles are attracted to familiar odors while adults show preferences for odors of opposite-sex conspecifics. Females show an increased preference for male odors as they mature, but no study has examined whether change with age is seen in males. In this experiment,(More)
Males of many mammalian species exhibit contest competition and scramble competition for mates, but the relationship between these 2 forms of competition remains poorly understood. The authors measured dominance rank and spatial ability as traits likely to be selected by contest and scramble competition, respectively, among male meadow voles (Microtus(More)