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Within-year differences in reproductive investment in laboratory zebra finches (Taeniopygia guttata), an opportunistically breeding bird

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Abstract

Reproduction in opportunistically breeding bird species has traditionally been considered non-seasonal with individuals taking advantage of favourable environmental conditions as they arise. However, some studies imply that this opportunistic breeding may be superimposed on an underlying seasonality, which has effects on the readiness to breed when conditions are favourable. The zebra finch (Taeniopygia guttata) is the classic opportunistic breeder and widely used as such in studies. In a series of laboratory-based breeding experiments, we found evidence to suggest that there are seasonal differences in maternal reproductive investment in the zebra finch even when photoperiod, temperature, relative humidity and diet were held constant. Females showed highly significant seasonal differences in clutch size and egg mass with laying order. Clutch size showed a spring/summer peak typical of multi-brooded species in the wild. There was also a significant increase in egg mass with laying order in all seasons except winter. This variation in breeding parameters with season may allow females to adjust investment depending on the potential fitness returns from a given reproductive attempt. These findings also raise a warning about interpreting results of multiple zebra finch breeding experiments that have been carried out in different seasons.

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Acknowledgements

We thank the Biotechnology and Biological Sciences Research Council and the Natural Environment Research Council for funding to JAG and the Natural Environment Research Council for a studentship for KAW and ECP. We are grateful to Isobel Maynard and Andrew Oliver for bird husbandry and to Kate Buchanan for improving the manuscript and Monique Mackenzie for very patient statistical advice. The experiments comply with the UK Home Office regulations for animal experimentation.

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Authors and Affiliations

  1. School of Biology, Harold Mitchell Building, St Andrews University, Fife, KY16 9TH, UK

    Kathryn Williamson, Emma C. Pariser & Jeff A. Graves

  2. The Macaulay Institute, Craigiebuckler, Aberdeen, AB15 8QH, UK

    Lucy Gilbert

  3. School of Biological, Earth and Environmental Sciences, University of New South Wales, Sydney, Australia

    Alison N. Rutstein

Authors
  1. Kathryn Williamson
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  2. Lucy Gilbert
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  3. Alison N. Rutstein
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  4. Emma C. Pariser
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  5. Jeff A. Graves
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Corresponding author

Correspondence to Jeff A. Graves.

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Williamson, K., Gilbert, L., Rutstein, A.N. et al. Within-year differences in reproductive investment in laboratory zebra finches (Taeniopygia guttata), an opportunistically breeding bird. Naturwissenschaften 95, 1143–1148 (2008). https://doi.org/10.1007/s00114-008-0436-2

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  • DOI: https://doi.org/10.1007/s00114-008-0436-2

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