Behavioral Ecology and Sociobiology

, Volume 37, Issue 5, pp 311–319 | Cite as

Is sex-biased maternal care limited by total maternal expenditure in polygynous ungulates?

  • Christophe Pélabon
  • Jean-Michel Gaillard
  • Anne Loison
  • Christine Portier
Article

Abstract

We examined data on sex-specific differences in neonatal weight, litter size and adult female body weight in 32 populations of polygynous ungulates of 18 different species to test for the existence of a trade-off between sex-biased maternal care and the total amount of maternal expenditure. This corresponds to an extension of the hypothesis of Byers and Moodie (1990) that sex-biased maternal care is limited by a high level of maternal expenditure. We did not find any relationship between sex-biased care and two measures of total maternal expenditure. We highlighted high intraspecific variability in sex-biased care and very low intraspecific variability in total maternal expenditure. Even when this between-population variability in sex-biased care was accounted for, no relationship between sex-biased maternal care and maternal expenditure was detected. Apart from difficulties in finding suitable measures for both variables, two other reasons may account for the lack of a relationship between sex-biased maternal care and total maternal expenditure. Firstly, male offspring seem to be more affected than female offspring by harsh environmental conditions. This may lead to the variation observed in the extent of sex-specific differences in birth weight within a single species. If we assume that for a given maternal expenditure reproductive costs incurred by mothers are highest during harsh conditions, this could indicate the existence of a trade-off between sex-biased maternal care and maternal expenditure at the intra-specific level, thereby supporting the Byers and Moodie hypothesis. Secondly, polygyny is only a poor predictor of sex-biased care and factors such as compensatory growth or extended periods of growth may be expected to modify predictions for different species. Thus, environmental conditions and relative effects of maternal care on male and female lifetime reproductive success are better predictors of sex-biased care than total maternal expenditure.

Key words

Sex-biased care Maternal expenditure Ungulates Neonatal dimorphism 

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Copyright information

© Springer-Verlag 1995

Authors and Affiliations

  • Christophe Pélabon
    • 1
  • Jean-Michel Gaillard
    • 1
  • Anne Loison
    • 1
  • Christine Portier
    • 1
  1. 1.Laboratoire de Biométrie Génétique et Biologie des Populations, URA CNRS 2055Université Lyon IVilleurbanne CedexFrance

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