Abstract
Sexual conflict is magnified during the post-fledging period of birds when the sexes face different trade-offs between continuing parental care or investing in self maintenance or other mating opportunities. Species with reversed sex roles provide a unique opportunity to study the relationship between mating systems and investment in parental care. Here, we provide the first detailed study of the length of care by males versus females (n = 24 pairs) during the post-fledging period, assessing factors that may promote care within and between the sexes. In the northern flicker Colaptes auratus, a species with partly reversed sex roles, males cared longer than females (average 16 versus 12 days, respectively). Overall, 36 % of females but no males deserted the brood prior to fledgling independence. Parents that provisioned nestlings at a high rate also spent more days feeding fledglings. Among males, age and nestling feeding rates were positively associated with the length of care. Among females, a low level of feather corticosterone (CORTf) was associated with a longer length of care. About 45 % of fledglings died within the first week, but fledglings with intermediate body mass had the highest survival suggesting stabilizing selection on mass. Fledgling survival was also higher in individuals with larger broods and lower levels of CORTf. We demonstrate that because females can be polyandrous they often desert the brood before males, and that the sexes respond to different cues relating to their energy balance when deciding the length of care given to their offspring.
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Acknowledgments
We thank J. Allsop, B. Griffiths, H. Hanbridge M. Mitsutani, A. Musgrove and M. Van der Pol for help in the field. T. Marchant, S. Cabezas, G. Treen and G. Fairhurst for laboratory analysis of CORTf. This research was funded by the Kenneth Molson Foundation, NSERC Discovery (K. L. W.), NSERC Canada Graduate Scholarship (E. A. G.), the Society of Canadian Ornithologists, and the Isabel Maria López Matínez Memorial Scholarship (E. A. G.). This study was conducted with Animal Care Permit number 20010113 from the University of Saskatchewan and corresponds with the current laws of Canada.
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Communicated by Indrikis Krams.
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Gow, E.A., Wiebe, K.L. Determinants of parental care and offspring survival during the post-fledging period: males care more in a species with partially reversed sex roles. Oecologia 175, 95–104 (2014). https://doi.org/10.1007/s00442-014-2890-1
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DOI: https://doi.org/10.1007/s00442-014-2890-1