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Table 1 Effect of hunger on identity in acoustic parameters.

From: The effect of hunger on the acoustic individuality in begging calls of a colonially breeding weaver bird

Acoustic parameter Effect of hunger treatment a   Variance components (in %)
    Estimate p-value   Hunger ID Nest Residual
  Duration (ms)   -4.17 ± 1.23 < 0.001   2.2 37.8 20.9 39.2
  Amplitude (dB) mean 2.98 ± 0.26 < 0.001   11.8 30.4 17.9 39.8
  Amplitude modulation (1/ms) variance (-0.02 ± 0.08) x10-3 0.753   0.2 21.4 11.0 67.4
  Frequency (Hz) mean -239.59 ± 36.87 < 0.001   3.9 31.5 19.2 45.4
Part 1 Frequency modulation mean 0.03 ± 0.34 0.926   0.4 43.7 20.9 35.0
  Frequency modulation variance 12.57 ± 5.19 0.016   0.3 35.7 12.7 51.3
  Entropy (log) mean 0.19 ± 0.03 < 0.001   3.6 22.8 37.4 36.2
  Entropy variance (-0.36 ± 10.85) x10-3 0.974   0.7 26.3 7.6 65.4
  Pitch (Hz) mean -289.59 ± 44.52 < 0.001   3.8 38.1 0.0 58.0
  Pitch goodness mean 24.33 ± 3.24 < 0.001   5.2 31.6 12.5 50.8
  Duration (ms)   15.85 ± 0.94 < 0.001   18.5 50.9 4.6 26.0
  Amplitude (dB) mean 4.58 ± 0.26 < 0.001   24.2 28.8 17.7 29.4
  Amplitude modulation (1/ms) (log) variance (-0.27 ± 0.06) x10-3 < 0.001   2.3 9.5 7.4 80.7
  Frequency (Hz) mean -32.08 ± 37.33 0.391   0.3 32.7 7.6 59.4
Part 2 Frequency modulation mean 1.39 ± 0.32 < 0.001   1.1 50.6 9.6 38.7
  Frequency modulation variance 11.94 ± 6.00 0.047   0.6 18.5 9.2 71.7
  Entropy (log) mean 0.26 ± 0.03 < 0.001   6.2 26.6 21.2 46.0
  Entropy variance (-1.43 ± 0.94) x10-2 0.128   0.0 31.6 1.4 66.9
  Pitch (Hz) mean -135.20 ± 48.15 0.005   0.4 42.0 1.5 56.2
  Pitch goodness mean 38.60 ± 3.82 < 0.001   7.5 17.8 30.0 44.8
  1. The effect of the hunger treatment on acoustic parameters and their variance components according to the differences in time stages of the experimental treatment (Hunger), identity (ID), origin (Nest) and unexplained variance (Residual), separately calculated for both parts of the begging call. Note that variance components for ID of mean amplitude might be overestimated since the measure was not standardized across individuals.
  2. a Estimates for the effect of hunger are given in change per hour. Number of dF = 294 for all tests. We used 1539 calls from 46 individuals and 27 nests for all tests. Bold typing indicates results that remain significant after correction for multiple testing (a = 0.0025, Bonferroni).