Fig. 2From: Sperm competition-induced plasticity in the speed of spermatogenesisPlasticity in testis size and spermatogenesis kinetics according to the social environment in Macrostomum lignano. In octets compared to pairs, flatworms exhibit a greater relative investment in testes (i.e., a larger residual testis area) and b an increased speed of spermatogenesis, here visualized as the observed proportion of worms exhibiting BrdU-pulse labelled elongated spermatids in their testes, for octets (open circles) and pairs (filled circles) 5-7d after a 30Â min pulse administration of BrdUBack to article page