2015
DOI: 10.1111/bij.12653
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Plasma carotenoid concentrations of incubating American kestrels (Falco sparverius) show annual, seasonal, and individual variation and explain reproductive outcome

Abstract: In wild birds, the proximate and ultimate factors that affect circulating carotenoid concentrations remain poorly understood. We studied variation in plasma carotenoid concentrations across several scales: annual, seasonal, pair, territory and individual, and evaluated whether carotenoid levels explained reproductive outcome of wild American kestrels (Falco sparverius). We sampled plasma carotenoid concentrations of 99 female and 80 male incubating kestrels from April-June in 2008–2012. Plasma carotenoid conce… Show more

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Cited by 6 publications
(2 citation statements)
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References 42 publications
(53 reference statements)
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“…It is unclear why kestrels may track shifts in one land cover type and not another. Animals may preferentially track shifts in prey if one class of prey is higher quality or quantity than another class of prey, but there is no evidence that kestrels choose to nest in one type of land cover preferentially over another (Strasser & Heath 2013) or that land cover determines diet quality (Sassani et al 2016). Alternatively, shifts in prey may release former constraints on other selective pressures to breed early, such as seasonal declines in fecundity (Gienapp & Visser 2006) or competition for high-quality mates.…”
Section: Discussionmentioning
confidence: 99%
“…It is unclear why kestrels may track shifts in one land cover type and not another. Animals may preferentially track shifts in prey if one class of prey is higher quality or quantity than another class of prey, but there is no evidence that kestrels choose to nest in one type of land cover preferentially over another (Strasser & Heath 2013) or that land cover determines diet quality (Sassani et al 2016). Alternatively, shifts in prey may release former constraints on other selective pressures to breed early, such as seasonal declines in fecundity (Gienapp & Visser 2006) or competition for high-quality mates.…”
Section: Discussionmentioning
confidence: 99%
“…This concept of internal carotenoid limitation assumes that the quantities of carotenoids absorbed from the diet, transported through the body and stored for future use are finite and small enough that birds may not be able to allocate sufficient carotenoids to both external ornamentation and internal processes. Importantly, it is well known that internal carotenoid resources and their allocation may differ widely through seasons based on breeding (particularly for females depositing carotenoids in yolk) or moult (for species with plumage coloration), and studies must consider that limitation may be present in some seasons but absent in others—though changes in dietary consumption may also compensate for changing need (Hill, ; Isaksson, Von Post, & Andersson, ; McGraw, Nolan, & Crino, ; Sassani, Sevy, Strasser, Anderson, & Heath, ). Internal carotenoid limitation is most commonly tested by assessing correlations among different physiological processes that may require carotenoids, such as immune system function and ornamental colour production.…”
Section: Assumption 1: Carotenoid Limitationmentioning
confidence: 99%