Supplementary material from "No evidence of male-biased sexual selection in a snake with conventional Darwinian sex roles"
Posted on 2020-09-25 - 09:00
Decades of research on sexual selection have demonstrated that ‘conventional’ Darwinian sex roles are common in species with anisogamous gametes, with those species often exhibiting male-biased sexual selection. Yet, mating system characteristics such as long-term sperm storage and polyandry have the capacity to disrupt this pattern. Here, these ideas were explored by quantifying sexual selection metrics for the western diamond-backed rattlesnake (Crotalus atrox). A significant standardized sexual selection gradient was not found for males (βSS = 0.588, p = 0.199) or females (βSS = 0.151, p = 0.664), and opportunities for sexual selection (Is) and selection (I) did not differ between males (Is = 0.069, I = 0.360) and females (Is = 0.284, I = 0.424; both p > 0.05). Furthermore, the sexes did not differ in the maximum intensity of precopulatory sexual selection (males: s′max = 0.155, females: s′max = 0.080; p > 0.05). Finally, there was no evidence that male snout–vent length, a trait associated with mating advantage, is a target of sexual selection (p > 0.05). These results suggest a lack of male-biased sexual selection in this population. Mating system characteristics that could erode male-biased sexual selection, despite the presence of conventional Darwinian sex roles, are discussed.
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Levine, Brenna A.; Schuett, Gordon W.; Clark, Rulon W.; Repp, Roger A.; Herrmann, Hans-Werner; Booth, Warren (2020). Supplementary material from "No evidence of male-biased sexual selection in a snake with conventional Darwinian sex roles". The Royal Society. Collection. https://doi.org/10.6084/m9.figshare.c.5132899.v1