A label of health: a previous immune challenge is reflected in the expression of a female plumage trait.
Studies of ornaments as indicators of individual quality have hitherto focused on males, while studies of female ornaments have been almost absent. However, females within the same species may show large variation in both outer appearance and individual quality. We experimentally examined the effect of an immune challenge on the size of white fringes in the wing feathers produced one to two months after the challenge in female common eiders (Somateria mollissima), a long-lived sea duck. Immune-challenged females produced feathers with smaller white fringes, showing that a previous immune challenge may affect the expression of a plumage trait. We also report an unexpected difference in the expression of this white plumage trait within the immune-challenged group, related to the specific immune response against one of the injected antigens.
Hanssen
Sveinn A
SA
Norwegian Institute for Nature Research, Polar Environmental Centre, Tromsø, Norway. sveinn.a.hanssen@nina.no
Hasselquist
Dennis
D
Folstad
Ivar
I
Erikstad
Kjell E
KE
D000818:Animals; D003116:Color; D004168:Diphtheria Toxoid / Q000276:immunology; D004372:Ducks / Q000033:anatomy & histology / Q000276:immunology*; D005241:Feathers / Q000033:anatomy & histology*; D005260:Female; D009425:Nesting Behavior; D012098:Reproduction; D013745:Tetanus Toxoid / Q000276:immunology; D014921:Wings, Animal / Q000033:anatomy & histology
D004168:Diphtheria Toxoid; D013745:Tetanus Toxoid