Behavioural Ecology

Oecologia

, Volume 143, Issue 3, pp 477-482

First online:

Carotenoid-based nestling colouration and parental favouritism in the great tit

  • Barbara TschirrenAffiliated withDivision of Evolutionary Ecology, Zoological Institute, University of Bern Email author 
  • , Patrick S. FitzeAffiliated withBehavioural Ecology Group, Zoology Department, University of Cambridge
  • , Heinz RichnerAffiliated withDivision of Evolutionary Ecology, Zoological Institute, University of Bern

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Abstract

While elaborate carotenoid-based traits in adult birds may have evolved as honest signals of individual quality in the context of sexual selection or other social interactions, the function of carotenoid-based colours in juveniles is less well understood. We investigated the hypothesis that carotenoid-based nestling colouration has evolved in response to parental preference of intensely coloured offspring during food provisioning. In a field experiment, we manipulated nestling plumage colouration by a carotenoid-supplementation and analysed the parental food provisioning behaviour before feather appearance and at the end of the nestling stage. Carotenoids per se did not influence the nestling’s begging behaviour or parental feeding decisions and we found no evidence that carotenoid-based colouration in nestling great tits has a signalling function in parent-offspring interactions. Parents did not discriminate between intensely coloured and control offspring in their food provisioning and in accordance with this finding intensely coloured nestlings were not heavier or larger at the end of the nestling stage. Alternative explanations for the evolution of carotenoid-based colours in nestling birds are discussed.

Keywords

Begging Feeding behaviour Food provisioning Parent-offspring interaction Signalling