Fig. 4From: Extensive variation in sperm morphology in a frog with no sperm competitionVariation in a sperm length (n = 86) and b the frequency of sperm with any abnormalities (n = 85) within and between mtDNA lineages and their contact zone (left), as well as within and among populations within those lineages (right). Lineages or populations (Tukey box plots) that do not share the same lower case letters within panels are significantly different (Tukey HSD post hoc tests) based on statistical models described in the textBack to article page