Plumage characteristics in tree swallows Tachycineta bicolor: Honest signals of condition, reproductive investment and mating strategies.

Plumage characteristics are known to honestly reflect individual quality in many species of birds, and influence inter- and intra-sexual interactions between conspecifics. However, the information content of plumage signals, and the resulting influence on the receivers, can vary among species. In this study, I investigated the ecological significance of plumage characteristics of male and female tree swallows (Tachycineta bicolor). More specifically, I examined whether plumage characteristics are 1) honest indicators of individual quality, 2) associated with past or current reproductive investment and success, and 3) important to mating strategies in this species. ...Collectively, my results demonstrate that plumage characteristics in tree swallows convey information about individual quality and influence the behaviour of conspecifics.