(left) Dark circles in the figure show the infection
prevalence (percent infected) of Microphallus in
P. antipodarum hosts. Treatments consisted of either
same sex or cohabitation sex conditions. Infection was
determined as the presence or absence of Microphallus. Within the all female treatment, likelihood ratio chi-squared analysis revealed a significant relationship between infection status and ploidy (LRX2=59.62; df=2; n=276; Sig. p < .001). Males were more infected than females (t34 = 6.9, P < 0.001). Ploidy was not determined for the all male treatment.