Sign up & Download
Sign in

Robin's egg blue: Does egg color influence male parental care?

by Philina A. English, Robert Montgomerie
Behavioral Ecology and Sociobiology ()

Abstract

A recent hypothesis suggests that birds’ blue- green egg colors may be a sexually selected signal of female (and potentially nestling) quality that males use to make parental investment decisions. While there is some empirical support for this idea, both theory and observa- tions question its validity. To test this hypothesis experi- mentally, we examined the influence of egg color on male American robin Turdus migratorius behavior by replacing natural clutches with four artificial eggs that were all either pale or vividly colored, close to the extremes in natural egg coloration. At the end of the incubation period, three unrelated nestlings were fostered into each experimental nest, and parental provisioning behavior was monitored when nestlings were 3, 6, and 9 days old. Male provision- ing rate for 3-day-old nestlings was significantly higher in the vivid egg treatment compared to both the pale egg treatment and untreated controls, but there was no effect of egg color on paternal behavior at the older nestling stages. Male feeding rate at unmanipulated nests was only weakly positively related to natural egg color (chroma) when nestlings were 3 days old. These results suggest that blue- green egg color may act as a post-mating signal of female quality or investment in this species, but our findings do not exclude the possibility that egg color pigmentation also serves other adaptive functions.

Cite this document (BETA)

Readership Statistics

21 Readers on Mendeley
by Discipline
 
 
 
by Academic Status
 
52% Ph.D. Student
 
10% Other Professional
 
10% Assistant Professor
by Country
 
10% United States
 
5% United Kingdom
 
5% Italy

Sign up today - FREE

Mendeley saves you time finding and organizing research. Learn more

  • All your research in one place
  • Add and import papers easily
  • Access it anywhere, anytime

Start using Mendeley in seconds!

Already have an account? Sign in