Male position in a sexual network reflects mating role and body size

Several species are characterised by male mating polymorphisms, which often associated with sperm competition for some phenotypes show specialisation. With high-resolution behavioural data, we used network analysis to quantify intensity; the probability of overlap ejaculates different males among competing European bitterling (Rhodeus amarus) in a large experimental mesocosm. Implementing Bayesian inference informative priors, modelled intensity adopting two alternative roles understand how varied between as function body size. We demonstrated that larger performing “guarder” role experienced lower than smaller males. In contrast, “sneaker males”, greater intensity. discuss these findings context system evolution and reproductive biology bitterling.