Behavioral Ecology and Sociobiology

, Volume 48, Issue 5, pp 353–357 | Cite as

Sexual dimorphism in house sparrow eggs

  • P. J. Cordero
  • S. C. Griffith
  • J. M. Aparicio
  • D. T. Parkin
Original Article

Abstract 

Recent evidence has revealed an apparently high degree of control by female birds over the physiological aspects of their reproduction and offspring sex allocation, consistent with adaptive hypotheses of sex allocation and differential investment in their offspring. In the house sparrow, we investigated possible mechanisms that may be used by females to enhance the fitness returns from a reproductive effort. Using molecular techniques, we demonstrate that house sparrow eggs containing male embryos are significantly larger than those containing female embryos. We also found that male embryos were laid randomly with respect to laying order. We speculate that this sexual dimorphism of eggs is adaptive, because male house sparrows show greater variance in condition-dependent reproductive success than females. More important, the result provides further evidence of the ability of females to detect or control ovulation of either male or female ova and to differentially invest in one sex over the other.

Key words Egg size Parental investment Passer domesticus Sex ratio 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2000

Authors and Affiliations

  • P. J. Cordero
    • 1
  • S. C. Griffith
    • 2
  • J. M. Aparicio
    • 1
  • D. T. Parkin
    • 3
  1. 1.Departamento de Ecología Evolutiva, Museo Nacional de Ciencias Naturales, C.S.I.C., J. Gutierrez Abascal 2, 28006 Madrid, Spain e-mail: pjcordero@mncn.csic.es Tel.: +34-91-4111328, Fax: +34-91-5645078ES
  2. 2.Department of Evolutionary Biology, Uppsala University, Norbyvägen 18d, 75236 Uppsala, SwedenSE
  3. 3.Division of Genetics, Queens Medical Centre, Nottingham, NG7 2UH, UKGB

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