Reproductive phenotype predicts adult bite-force performance in sex-reversed dragons (Pogona vitticeps )
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AbstractSex‐related differences in morphology and behavior are well documented, but the relative contributions of genes and environment to these traits are less well understood. Species that undergo sex reversal, such as the central bearded dragon (Pogona vitticeps), offer an opportunity to better understand sexually dimorphic traits because sexual phenotypes can exist on different chromosomal backgrounds. Reproductively female dragons with a discordant sex chromosome complement (sex reversed), at least as juveniles, exhibit traits in common with males (e.g., longer tails and greater boldness). However, the impact of sex reversal on sexually dimorphic traits in adult dragons is unknown. Here, we investigate the effect of sex reversal on bite‐force performance, which may be important in resource acquisition (e.g., mates and/or food). We measured body size, head size, and bite force of the three sexual phenotypes in a colony of captive animals. Among adults, we found that males (ZZm) bite more forcefully than either chromosomally concordant females (ZWf) or sex‐reversed females (ZZf), and this difference is associated with having relatively larger head dimensions. Therefore, adult sex‐reversed females, despite apparently exhibiting male traits as juveniles, do not develop the larger head and enhanced bite force of adult male bearded dragons. This pattern is further illustrated in the full sample by a lack of positive allometry of bite force in sex‐reversed females that is observed in males. The results reveal a close association between reproductive phenotype and bite force performance, regardless of sex chromosome complement.
CitationJones, MEH, Pistevos, JCA, Cooper, N, et al. Reproductive phenotype predicts adult bite‐force performance in sex‐reversed dragons (Pogona vitticeps). J Exp Zool. 2020; 1– 12. https://doi.org/10.1002/jez.2353
Item DescriptionThis is the peer reviewed version of the following article: Jones, MEH, Pistevos, JCA, Cooper, N, et al. Reproductive phenotype predicts adult bite‐force performance in sex‐reversed dragons (Pogona vitticeps). J Exp Zool. 2020; 1– 12. https://doi.org/10.1002/jez.2353, which has been published in final form at https://doi.org/10.1002/jez.2353. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. The attached file is the final accepted manuscript version, you are advised to consult the publisher’s version if you wish to cite from it.