Females that Imitate Males: Dorsal Coloration Varies with Reproductive Stage in FemalePodarcis bocagei(Lacertidae)

Abstract

Abstract Adults of Bocage's Wall Lizard (Podarcis bocagei), a lacertid endemic to the northwestern Iberian Peninsula, generally show marked sexual dichromatism with males having green dorsal coloration and females brown dorsal coloration. In some populations, however, some adult females show dorsal coloration similar to that of males. I used mark-recapture methods to study a population of this type on a coastal promontory in A Coruna. A proportion of adult females showed green dorsal coloration during the reproductive period (April–July), but not during the rest of the year. Green dorsal coloration was most frequent among females with oviductal eggs, whereas preovulatory females with vitellogenic follicles in all cases showed brown dorsal coloration. These findings suggest that the green dorsal coloration observed in some females may be related to stage in the reproductive cycle, with green coloration developing during the gravid phase (i.e., with fertilized eggs). The findings also raise the possibility ...