22 February 2019 Duetting correlates with territory quality and reproductive success in a suboscine bird with low extra-pair paternity
Pedro Diniz, Regina H. Macedo, Michael S. Webster
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Duetting has been intensively studied, but we still have little consensus about its fitness consequences. Some studies suggest that duetting functions in acoustic mate guarding to prevent cuckoldry (acoustic paternity guarding hypothesis), whereas other studies argue that duetting is a cooperative behavior to defend common resources (territory defense hypothesis). We tested these 2 hypotheses by investigating the relationships among song traits, extra-pair paternity, territory quality and reproductive success in the Rufous Hornero (Furnarius rufus), a Neotropical, socially monogamous bird. We found a low rate of extra-pair paternity (3.33% of 120 offspring and 6.52% of 46 broods), which suggests that acoustic paternity guarding is probably not a primary function of duetting behavior in this species. Female song output was positively correlated with territory quality, measured as the availability of territory foraging patches. The number of young that survived post-fledging was positively correlated with duet duration, but not with territory features. Our results support the territory defense hypothesis, suggesting that female song in duets might be used in the defense of food resources within territories. Our study provides the first evidence that song traits correlate with both territory features and reproductive success in a duetting species.

Copyright © American Ornithological Society 2019. All rights reserved. For permissions, e-mail: journals.permissions@oup.com. This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model).
Pedro Diniz, Regina H. Macedo, and Michael S. Webster "Duetting correlates with territory quality and reproductive success in a suboscine bird with low extra-pair paternity," The Auk 136(1), 1-13, (22 February 2019). https://doi.org/10.1093/auk/uky004
Received: 9 January 2018; Accepted: 11 September 2018; Published: 22 February 2019
female song
Furnarius rufus
joint territory defense
social monogamy
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