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Newsletter Wellness, Meet Inbox. If all males in female-biased tanks can establish territories, but at male-biased sex ratios, territories are limiting, red may be a badge of status, with males of low status decreasing red to escape fights. Contrasting hybridization rates between sympatric three-spined sticklebacks highlight the fragility of reproductive barriers between evolutionarily young species. In our field study, we sampled both limnetics and benthics because the number of males of each type mate availability may alter reproductive isolation between the two species via changes in female choice. If the sexes respond to sex ratio but not age, according to classic OSR theory, male—male competition and sexual signaling should be at their highest and females most choosy when the sex ratio is male biased Kvarnemo and Ahnesjo
During the same three time periods, we assessed the throat color index of all males in treatment tanks using a standardized color scoring method developed by our lab group Boughman , ; Lewandowski and Boughman that closely matches reflectance data Albert et al. Missionary with a split. Variation in the abundance of limnetic and benthic males may lead to species—specific encounter rates that vary seasonally and spatially. The evolution of mating preferences and the paradox of the lek. Each male in the group displays by vigorously hovering or by perching on the top of vegetation with wings spread and bright yellow scent brushes dangling. Trap ID was a random effect in the model.