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Figure 1


Fig. 1. Number of chirps (A) and rises (B) (mean ± s.e.m.) produced during playback stimulation as a function of difference frequency (Df) in A. leptorhynchus (N=20, open squares) and A. albifrons (N=31, closed circles). (A) Both species produced significantly more chirps (low- and high-frequency chirps combined) in response to stimuli close in frequency to their own EOD (within 20 Hz) than to distant frequencies (±150 Hz). (B) There was no effect of Df on the number of rises (long-duration modulations) produced by either species. Data points with different letters differ significantly from each other; Tukey's HSD, P<0.05. NS, no significant effect of Df (repeated-measures ANOVA, P>0.05).





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