Behavioral Ecology and Sociobiology

, Volume 62, Issue 12, pp 1899–1908 | Cite as

Maternal investment in eggs is affected by male feet colour and breeding conditions in the blue-footed booby, Sula nebouxii

  • Fabrice Dentressangle
  • Lourdes Boeck
  • Roxana Torres
Original Paper

Abstract

Females are expected to vary investment in offspring according to variables that may influence the offspring fitness in a way that optimises her inclusive fitness for a particular context. Thus, when sexual ornaments signal the quality of the male, females might invest in reproduction as a function of the attractiveness of their mate. We tested whether breeding conditions and male feet colour influence reproductive decisions of blue-footed booby females. In the blue-footed booby, male feet colour is a dynamic condition-dependent sexually selected trait that is related to paternal effort. During two consecutive years, an El Niño year (poor breeding conditions) and a year with good breeding conditions, we experimentally reduced male attractiveness by modifying their feet colour after the first egg was laid and recorded female investment in the second egg. We found that, relative to the first egg in the clutch, females laid heavier second eggs during the poor year than during the good year. Females paired with males with duller feet colour reduced second-egg mass and volume and delayed the laying of the second egg, independently of the year. Absolute yolk androstenedione (A4) concentration (but not testosterone, T) in second eggs was higher during a poor year than during a good year. Only during a year with poor breeding conditions, females paired with experimental males decreased the relative A4 concentration (but not T) in the second egg compared to control females. Thus, blue-footed booby females probably favour brood reduction by decreasing egg quality and increasing size asymmetry between chicks when the breeding and the mate conditions are poor.

Keywords

Sexual traits Egg quality Laying asynchrony Yolk androgens Sula nebouxii Maternal effects 

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Copyright information

© Springer-Verlag 2008

Authors and Affiliations

  • Fabrice Dentressangle
    • 1
  • Lourdes Boeck
    • 2
  • Roxana Torres
    • 1
  1. 1.Instituto de Ecología, Departamento de Ecología Evolutiva, Laboratorio de Conducta AnimalUniversidad Nacional Autónoma de MéxicoMéxicoMéxico
  2. 2.Laboratorio de Hormonas Esteroides, Biología de la ReproducciónInstituto Nacional de Ciencias Médicas y de la Nutrición, Salvador ZubiránMéxicoMéxico

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