Summarized information of experiments 1 to 4 (limited choice).

For each experiment are displayed the sex and the species of the choosing partner (such as female choice or male competition), the number of observed homo- and hetero-specific pairs and the number of worms that remained single. Sh = S. haematobium and Sb = S. bovis. Expected number of pairs under random mating hypothesis is shown in brackets (see the statistics section in Materials and Methods for details). Chi-square statistic, degree of freedom and P-value are given for each hamster, for each experiment and for all experiments combined. * indicates significant results at 5% level. In Exp. 3, worms from only two hamsters could be analysed, while others died prematurely (two hamsters) or presented too few numbers of paired worm (one hamster).