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Fig. 11. Mean efficiency of sound production E for individuals of each
species. There were no statistically significant differences in E
between individual S. borellii. One S. vicinus had a mean
E significantly lower than the others. In both species the major
cause of variation in E was that Pac was
generally more variable than Pcall. Overall E was
significantly greater in S. borellii than in its congener. Values are
means ± 95% CI.