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Table 1.

Multiple comparisons of peak-amplitude frequencies (from power spectra)among the five groups of EODs shown inFig. 1 

Mean peak-amplitude frequency (Hz)P-value of Fisher LSD multiple comparison test
GroupNvs type I females and non-breeding malesvs type I breeding malesvs type II females and non-breeding malesvs type II breeding males
Type I females and non-breeding males 18 2973 (±184)     
Type I breeding males 18 1088 (±93) P<0.0001    
Type II females and non-breeding males 18 1771 (±151) P<0.0001 P=0.0001   
Type II breeding males 23 1138 (±64) P<0.0001 P=0.7569 P=0.0002  
Type III females and males combined 14 802 (±49) P<0.0001 P=0.1209 P<0.0001 P=0.0563 
Mean peak-amplitude frequency (Hz)P-value of Fisher LSD multiple comparison test
GroupNvs type I females and non-breeding malesvs type I breeding malesvs type II females and non-breeding malesvs type II breeding males
Type I females and non-breeding males 18 2973 (±184)     
Type I breeding males 18 1088 (±93) P<0.0001    
Type II females and non-breeding males 18 1771 (±151) P<0.0001 P=0.0001   
Type II breeding males 23 1138 (±64) P<0.0001 P=0.7569 P=0.0002  
Type III females and males combined 14 802 (±49) P<0.0001 P=0.1209 P<0.0001 P=0.0563 

EODs were recorded at the Ivindo River from adults of the type I and type II morphs or at the Okano River from all sub-adults and adults of type III(N=number of individuals compared). For each group, the table gives the mean peak-amplitude frequency (±s.e.m.). These means differ significantly among groups (F4.86=50.48; P<0.0001; one-way ANOVA). The table also provides P-values for post-hoc comparisons of means between all possible pairs of groups (based on the Fisher LSD test, which is relatively liberal in terms of finding significant differences).

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