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Figure 4


Fig. 4. Relationship between number of pulses per sound and total sound duration for courtship–female-visit, nest preparation, aggressive 1–2 pulse and aggressive >2 pulse sounds produced by the Hawaiian sergeant fish, Abudefduf abdominalis. There is a positive linear relationship between pulse number and sound duration for all four sound types. Coefficient of determination (r2), linear regression statistics, sample sizes and line equations for each sound type are as follows: courtship–female-visit (r2=0.84, P<0.001, N=78, y=5.4x+1.3); nest preparation (r2=0.78, P<0.001, N=38, y=3.3x+1.6); aggressive 1–2 pulse (r2=0.22, P=0.02, N=26, y=2.1x+1.2); aggressive >2 pulse (r2=0.62, P<0.001, N=37, y=3.1x+2.4).





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