Meeting Abstract

10.1  Sunday, Jan. 4 08:00  Bearded ladies: female lizards suffer fitness consequences when bearing male traits LANGKILDE, T*; SWIERK, LN; NORJEN, CM; Penn State University; Berkley; Ohio State University

A central assumption in evolutionary biology is that females of sexually dimorphic species suffer costs when bearing male secondary sexual traits, such as ornamentation. Nevertheless, it is common in nature to observe females bearing rudimentary versions of male ornaments (e.g. ‘bearded ladies’), as ornaments can be under similar genetic control in both sexes. Here, we provide evidence that masculinized females incur both social and reproductive costs in nature. Male fence lizards (Sceloporus undulatus) discriminated against ornamented females during mate choice. Ornamented females had lower reproductive output, and produced eggs that were laid and hatched later than those of non-ornamented females. Females with experimentally elevated T levels had lower hatching success of eggs, and produced smaller offspring that survived less well. These findings support established theories of the evolution of sexual dimorphism and intralocus sexual conflict, and raise questions regarding the persistence of masculinizing ornamentation in females.