Figure 4

Mate choice in males and females in relation to eye span. (A) Experimental design. Two females with different eye spans and one male with an intermediate eye span were placed in a Petri dish and allowed to mate freely. (B) Results of 58 tests evaluating male choice of longer-eyed females. Frequencies are shown in percentages with standard errors and are categorized into three groups with respect to the number of matings (total, 4 times or fewer, and 5 times or more). P means P values according to Pearson’s Chi-square tests. (C) Experimental design. Two males with different eye-span lengths and one female with an intermediate eye-span were placed in a Petri dish and allowed to mate freely. (D) Results of 53 tests evaluating female choice of longer-eyed males. Frequencies are shown in percentages with standard errors. In the left graph, data are categorized into three groups with respect to the number of matings (total, 4 times or fewer, and 5 times or more). In the right graph, data are categorized into two groups with respect to the timing of mating during observation (first half and second half). P means P values according to Pearson’s Chi-square tests. The illustrations in (A) and (C) were processed by Microsoft PowerPoint 2007 software (www.microsoft.com).