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A receiver bias for red predates the convergent evolution of red color in widowbirds and bishops

Journal article
Authors Calum E. Ninnes
Marius Adrion
P. Edelaar
J. L. Tella
Staffan Andersson
Published in Behavioral Ecology
Volume 26
Issue 4
Pages 1212-1218
ISSN 1045-2249
Publication year 2015
Published at Department of Biological and Environmental Sciences
Pages 1212-1218
Language en
Links dx.doi.org/10.1093/beheco/arv068
Keywords carotenoid pigmentation, Euplectes, preexisting receiver bias, sensory bias, sexual selection, status, AGELAIUS-PHOENICEUS, EUPLECTES SPP., SHOULDERED WIDOWBIRDS, COLLARED, WIDOWBIRDS, PLUMAGE COLORATION, WINGED BLACKBIRD, LONG TAILS, DOMINANCE, SIGNALS, PREFERENCES, Behavioral Sciences, Biology, Ecology, Zoology
Subject categories Ecology, Zoology

Abstract

In the African widowbirds, icons of sexual selection, bright red plumage colors are agonistic (threat) signals in territorial competition, but in the congeneric bishop birds, color functions remain obscure. In the yellow-crowned bishop, the earliest branching lineage of the genus, an experimentally introduced red color patch gave a competitive advantage over yellow. This indicates agonistic sexual selection for red also in bishops, and that a receiver bias predated the evolution of red coloration in the genus.Preexisting receiver biases are well known and empirically supported alternatives or complements to signal evolution through coevolving mate choice, but largely neglected as drivers of sexually or socially selected agonistic signal evolution. In further pursuit of a recently revealed receiver bias for red agonistic signaling in Euplectes (17 species of widowbirds and bishops), we investigate here its presence in the yellow-crowned bishop (Euplectes afer), a representative of the earliest phylogenetic branch of the genus. In a captive population in southern Spain, where the yellow-crowned bishop is invasive, we staged and filmed 10-min dyadic contests over access to a feeder, between males with experimentally yellow- (control-) and red-painted crown plumage, respectively. Red males secured significantly more time at the feeder, and tended to win more of the limited number of supplant attempts observed. This suggests that the previously demonstrated agonistic signal function of red carotenoid coloration in widowbirds also applies to the bishop birds, and may derive from a receiver bias (aversion) that is substantially older than the convergent gains of red plumage pigmentation in Euplectes, and perhaps also predating the evolution of red in a few other weaverbird (Ploceidae) lineages. Given the similarities in ecology and behavior across Euplectes, the color diversity appears to primarily be a consequence of evolutionary limitations on mechanisms for achieving red coloration.

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