Young adults also produced significantly higher maximum F0 frequencies (mean 1599 ± 57 Hz, range 1387 – 1788) than old adults (mean 1441 ± 23 Hz, range 1329 – 1546, T (15) = 2.88, p = 0.02), but an inverse relationship ( r = −0.474) between the maximum F0 of great call climaxes and caller age barely failed to reach statistical significance (F (1, 15) = 3.99; p = 0.06).
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Age related decline in female lar gibbon great call performance suggests that call features correlate with physical condition.
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0.0600
0.1100
The sentences
The overall negative correlation ( r = − 0.425) across the entire population, however, barely failed to reach significance (F (1, 15) = 3.32; p = 0.09).
a significant trendp = 0.11
We did not find a significant trend in duty cycle change over the course of bouts ( r = 0.13) (F (1, 6) = 0.11; p = 0.11).