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Bar plots of the duration of intra- or interspecific copulations. Number of replicates are given above the column bars expressing the means, whereas the s.e.m are given as vertical line bars. The effect of crossing type on the duration of copulations was significant, and the effect of species of male was bordering significance (two-way ANOVA, crossing type: F1,122=340.44, P<0.001, male species: F1,122=3.65, P=0.06).
