SSD and success in mating initiation by males in G. gracilicornis in laboratory experiments. (a) Effect of the TTL ratio (Female/Male; F/M TTL in Figure 2) on male success in mating initiation (n = 61). The arrow indicates mean F/M TTL ratio of G. gracilicornis wild population, 1.18. (b) Effect of the MCG/FTG ratio (Female/Male) on male success in mating initiation (n = 49). (c) The distribution of MCG/FTG ratio categories (three categories) among successful (n = 32) and unsuccessful (n = 17) mating pairs of G. gracilicornis in the laboratory experiments.