Incubation Temperature Affects Duckling Body Size and Food Consumption Despite No Effect on Associated Feeding Behaviors

dc.contributor.authorHope, Syndey F.en
dc.contributor.authorKennamer, R. A.en
dc.contributor.authorGrimaudo, A. T.en
dc.contributor.authorHallagan, John J.en
dc.contributor.authorHopkins, William A.en
dc.contributor.departmentBiological Sciencesen
dc.description.abstractDevelopmental conditions can have consequences for offspring fitness. For example, small changes (<1°C) in average avian incubation temperature have large effects on important post-hatch offspring phenotypes, including growth rate, thermoregulation, and behavior. Furthermore, average incubation temperatures differ among eggs within the same nest, to the extent (i.e., >1°C) that differences in offspring phenotypes within broods should result. A potential consequence of within-nest incubation temperature variation is inequality in behaviors that could cause differences in resource acquisition within broods. To investigate this, we incubated wood duck (Aix sponsa) eggs at one of two ecologically-relevant incubation temperatures (35°C or 36°C), formed mixed-incubation temperature broods after ducklings hatched, and conducted trials to measure duckling behaviors associated with acquisition of heat (one trial) or food (three trials). Contrary to our predictions, we found no effect of incubation temperature on duckling behaviors (e.g., time spent occupying heat source, frequency of feeding bouts). However, we found evidence that ducklings incubated at the higher temperature consumed more food during the 1-h feeding trials, and grew faster in body mass and structural size (culmen and tarsus) throughout the study, than those incubated at the lower temperature. Apparent food consumption during the trials was positively related to culmen length, suggesting that differences in food consumption may be driven by structural size. This could result in positive feedback, which would amplify size differences between offspring incubated at different temperatures. Thus, our study identifies incubation temperature as a mechanism by which fitness-related phenotypic differences can be generated and even amplified within avian broods.en
dc.description.sponsorshipThis work was supported by the National Science Foundation Graduate Research Fellowship Program [478969]; the Virginia Tech Graduate Student Assembly Graduate Research Development Program; and the Institute for Critical Technology and Applied Science at Virginia Tech. This material is based upon work financially supported by the U.S. Department of Energy under Award Number DE-FC09-07SR22506 to the University of Georgia Research Foundation. The U.S. Department of Energy had no involvement in the study design, collection, analysis, and interpretation of the data, or in the decision to publish this article. Funding for Open Access was provided by Virginia Tech’s Open Access Subvention Fund.en
dc.format.extent18 pagesen
dc.publisherOxford University Pressen
dc.rightsCreative Commons Attribution 4.0 Internationalen
dc.titleIncubation Temperature Affects Duckling Body Size and Food Consumption Despite No Effect on Associated Feeding Behaviorsen
dc.title.serialIntegrative Organismal Biologyen
dc.typeArticle - Refereeden
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