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Tough decisions: Reproductive timing and output vary with individuals' physiology, behavior and past success in a social opportunistic breeder

Mariette, Mylene M., Buchanan, Katherine L., Buttemer, William A. and Careau, Vincent 2015, Tough decisions: Reproductive timing and output vary with individuals' physiology, behavior and past success in a social opportunistic breeder, Hormones and behavior, vol. 76, pp. 23-33, doi: 10.1016/j.yhbeh.2015.03.011.

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Title Tough decisions: Reproductive timing and output vary with individuals' physiology, behavior and past success in a social opportunistic breeder
Author(s) Mariette, Mylene M.
Buchanan, Katherine L.ORCID iD for Buchanan, Katherine L. orcid.org/0000-0002-6648-5819
Buttemer, William A.
Careau, Vincent
Journal name Hormones and behavior
Volume number 76
Start page 23
End page 33
Total pages 11
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2015-11
ISSN 1095-6867
Keyword(s) Canonical analysis
Correlational selection
Corticosterone
Fitness
Fledgling survival
Metabolic rate
Reproductive plasticity
Reproductive timing
Selection gradient
Zebra finch
Summary This article is part of a Special Issue SBN 2014. Photoperiod and the hormonal response it triggers are key determinants of reproductive timing in birds. However, other cues and physiological traits may permit flexibility in the timing of breeding and perhaps facilitate adaptation to global change. Opportunistic breeders are excellent models to study the adaptive significance of this flexibility, especially at the individual level. Here, we sought to quantify whether particular male physiological and behavioral traits were linked to reproductive timing and output in wild-derived zebra finches. We repeatedly assessed male stress-induced corticosterone levels (CORT), basal metabolic rate (BMR), and activity before releasing them into outdoor aviaries and quantifying each pair's breeding timing, investment, and output over a seven-month period. Despite unlimited access to food and water, the colony breeding activity occurred in waves, probably due to interpair social stimulations. Pairs adjusted their inter-clutch interval and clutch size to social and temperature cues, respectively, but only after successful breeding attempts, suggesting a facultative response to external cues. When these effects were controlled for statistically or experimentally, breeding intervals were repeatable within individuals across reproductive attempts. In addition, males' first laying date and total offspring production varied with complex interactions between pre-breeding CORT, BMR and activity levels. These results suggest that no one trait is under selection but that, instead, correlational selection acts on hormone levels, metabolism, and behavior. Together our results suggest that studying inter-individual variation in breeding strategy and their multiple physiological and behavioral underpinnings may greatly improve our understanding of the mechanisms underlying the evolution of breeding decisions.
Language eng
DOI 10.1016/j.yhbeh.2015.03.011
Field of Research 060801 Animal Behaviour
060603 Animal Physiology - Systems
Socio Economic Objective 970106 Expanding Knowledge in the Biological Sciences
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2015, Elsevier
Persistent URL http://hdl.handle.net/10536/DRO/DU:30074589

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