Abstract
Despite the growing literature on facultative sex-ratio adjustment in chromosomal sex-determining vertebrate taxa (birds, mammals), the consistency of results is often low between studies and species. Here, we investigate the primary and secondary offspring sex ratio of a small passerine bird, the Eurasian Penduline Tit (Remiz pendulinus) in three consecutive years. This species has a uniquely diverse breeding system, in which the male (and/or the female) abandons the nest during egg-laying, and starts a new breeding attempt. This allowed us to test (1) whether patterns of parental care, i.e., male-only care, female-only care or biparental desertion, influence offspring sex ratio, and (2) whether the offspring sex ratio is repeatable between successive clutches of males and females. Using molecular markers to sex 497 offspring in 176 broods, we show that (1) offspring sex ratio does not depend on which parent provides care, and (2) the offspring sex ratio is not repeatable between clutches of a given individual. The overall primary and secondary offspring sex ratio at a population level is not different from parity (54 ± 6% males, and 50 ± 3% (mean ± SE), respectively). We suggest that ecological and phenotypic factors, rather than individual traits of parents, may influence offspring’s sex, and conclude that there is currently no evidence for a facultative adjustment of offspring sex ratio in the Penduline Tit.
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Acknowledgments
We would like to thank the people that assisted in the field work: Maarten Bleeker, Dušan Brinkhuizen, Kenneth Hayes, Péter Horváth, Arno wa Kang’eri, Sjouke Kingma, Otília Menyhárt and Lídia Mészáros. We also acknowledge Kiskunság National Park and Szegedfish Ltd for permission to carry out our fieldwork at Fehértó. The manuscript benefited from comments on earlier drafts by Tim Fawcett, Thomas Friedl, and one anonymous reviewer. The research leading to these results has received funding from the European Community’s Sixth Framework Programme (FP6/2002–2006) under contract no. 28696. Further financial support was provided by a University Studentship of the University of Bath to R.E.v.D., and grants from the Hungarian National Science Foundation (OTKA T031706, T043390) and a Royal Society Joint Project grant (15056) to T.S. T.S. was also supported by The Leverhulme Trust (RF/2/RFG/2005/0279) and a HRDY Visiting Fellowship of Harvard University. The fieldwork carried out for this study complies with the Hungarian law.
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Communicated by T. Friedl.
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van Dijk, R.E., Komdeur, J., van der Velde, M. et al. Offspring sex ratio in the sequentially polygamous Penduline Tit Remiz pendulinus . J Ornithol 149, 521–527 (2008). https://doi.org/10.1007/s10336-008-0299-5
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DOI: https://doi.org/10.1007/s10336-008-0299-5