Fig. 6. Effects of preventing male abdominal and cephalothorax contact on (A) thump, (B) scrape and (C) buzz seismic signals. Within individuals, peak intensities were normalized to the maximum intensity produced for all of the signal components. Normalized intensities were then averaged, and the relative dB difference between the treatments calculated. Graphs show relative dB difference between the treatments (control, experimental treatment and recovery) of all the individuals tested ± S.D. (N=5). Experimental treatments attenuated peak frequencies of scrape and high-frequency (>500 Hz) ranges of thumps significantly (^*P<0.05; Tukey post-hoc test with Bonferonni corrections). No significant differences were observed for buzz and low (<500 Hz)-frequency ranges of thumps. No significant differences were observed between control and recovery treatments.