Evolution of Sexual Dichromatism. 2. Carotenoids and Melanins Contribute to Sexual Dichromatism in New World Orioles (Icterus spp.)

The Auk

Christopher M. Hofmann¹  Thomas W. Cronin¹  Kevin E. Omland¹ 

关键词: comparative methods;    Icterus;    independent contrasts;    loss of elaboration;    sexual dichromatism;   

DOI  :  10.1525/auk.2008.07113

学科分类：动物科学

来源: Central Ornithology Publication Office

【 摘 要 】

Several recent studies have investigated how different proximate mechanisms of color production contribute to sexual dichromatism. These studies suggest that carotenoid pigments—which are frequently subject to sexual selection—are more strongly associated with sexual dichromatism than melanins. This reasoning implicitly assumes that increased male elaboration leads to sexual dichromatism. However, sexual dichromatism can be generated through multiple evolutionary pathways, including decreases in female elaboration. We examined whether evolutionary changes in carotenoid- and melanin-based plumage were correlated within New World orioles (Icterus spp.), a genus in which male elaboration is ancestral and only female elaboration varies. We found a significant correlation between evolutionary changes in the degree of carotenoid and eumelanin sexual dichromatism. These findings differ from those of previous comparative studies and suggest the possibility of interesting differences when different evolutionary pathways—such as changes in male versus female coloration—lead to sexual dichromatism.

【 授权许可】

Unknown