Many factors, including nestling age, brood size, and mate quality, can influence the provisioning behaviour of adult birds. Mate quality may affect provisioning behaviour because high-quality individuals may be 'good parents' and provision at higher rates. Alternatively, individuals
paired to high-quality mates may provision at higher rates because the benefits provided by such mates (e.g. good genes) increase the likelihood of reproductive success. We examined variation in the plumage colour of male and female Eastern Phoebes (Sayornis phoebe) and the possible
relationship between such variation and provisioning behaviour. During the 2006–2007 breeding seasons, we captured, banded, and measured adult Eastern Phoebes and collected belly feathers for spectral analyses. We also videotaped nests to quantify provisioning behaviour. Male Eastern
Phoebes were larger than females, but the plumage (belly feathers) of males and females did not differ in brightness, hue, and carotenoid chroma (all P≥0.37). Females provisioned nestlings at higher rates than males (P=0.009), but we found no significant relationship between
provisioning rates of males and females and plumage colour. However, relationships between female provisioning rates and the brightness and carotenoid chroma of their mates' belly feathers approached significance (P≤0.08). The larger size of male Eastern Phoebes suggests there is
male–male competition for access to resources (e.g. nest sites and mates), with larger size conferring a selective advantage. However, the absence of intersexual differences in plumage colour suggests limited sexual selection driven by female choice for extra-pair partners. Differences
in provisioning rates of males and females may be due to male uncertainty of paternity status or to intersexual differences in foraging behaviour. The relationship between female provisioning rates and male plumage quality suggests that females may invest more in reproduction if male Eastern
Phoebes with brighter, carotenoid-rich belly plumage are better able to provide quality nest sites and territories or, perhaps, high-quality genes that can potentially enhance female fitness (differential-allocation hypothesis).
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GOOD PARENT HYPOTHESIS;
Document Type: Research Article
Publication date: 01 August 2017
This article was made available online on 07 July 2017 as a Fast Track article with title: "Plumage colouration and the provisioning behaviour of male and female Eastern Phoebes".
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Avian Biology Research provides a forum for the publication of research in every field of ornithology. It covers all aspects of pure and applied ornithology for wild or captive species as well as research that does not readily fit within the publication objectives of other ornithological journals. By considering a wide range of research fields for publication, Avian Biology Research provides a forum for people working in every field of ornithology. The journal also includes sections on avian news, conference diary and book reviews.
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