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Maternal androgens in the pied flycatcher: timing of breeding and within-female consistency

  • Behavioral Ecology
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Abstract

Maternal hormones can have substantial phenotypic effects in the progeny of many vertebrates. It has been proposed that mothers adaptively adjust hormone levels experienced by particular young to optimize their reproductive output. In birds, systematic variation in egg hormone levels has been related to different female reproductive strategies. Because in many bird species prospects of the offspring change seasonally and with brood number, strategic adjustment of yolk androgen levels would be expected. To test this idea, we induced pied flycatcher (Ficedula hypoleuca) females to nest twice during the same season by removing their first clutches shortly after clutch completion. We collected eggs of first and replacement clutches to measure yolk concentrations of androstenedione (A4) and testosterone (T) and captured the females that laid these clutches for phenotypic measurements. Although average egg androgen levels were remarkably consistent within females, hormone patterns differed considerably between first and replacement clutches. Eggs of replacement clutches were heavier with larger yolks compared to first clutches, but they contained on average lower levels of androgens. Within clutches, androgen concentration increased over the laying sequence in the first clutch, but decreased or remained more constant over the laying sequence in the replacement clutch. Mean yolk T, but not A4 levels, were negatively associated with laying date for both breeding attempts. Moreover, females in good body condition produced eggs containing lower levels of androgens than females in poor condition. Our results are consistent with the idea that differences in yolk androgen levels may be one mechanism underlying seasonal variation in reproductive success and it is possible that changes in egg androgen patterns may reflect a change in female reproductive strategy. High within-female consistency also highlights the possibility that there may be some underlying genetic variation in yolk androgen levels.

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Acknowledgements

We thank Henrik Smith for statistical advice and comments on an earlier draft. Four anonymous reviewers provided helpful comments that improved the quality of the manuscript. The study was approved by the ethical committee for animal research, Malmö/Lund, Sweden. Financial support was provided by the Swedish Research Council (to M. Sandell).

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  1. Department of Animal Ecology, Lund University, 223 62, Lund, Sweden

    Michael Tobler, Martin Granbom & Maria I. Sandell

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  1. Michael Tobler
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  2. Martin Granbom
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  3. Maria I. Sandell
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Correspondence to Michael Tobler.

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Communicated by Markku Orell.

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Tobler, M., Granbom, M. & Sandell, M.I. Maternal androgens in the pied flycatcher: timing of breeding and within-female consistency. Oecologia 151, 731–740 (2007). https://doi.org/10.1007/s00442-006-0610-1

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  • DOI: https://doi.org/10.1007/s00442-006-0610-1

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