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Table 1 Spectrogram measurements selected to compare the frequencies (Hz) of basic syllables comprising the different calls of Crested Guineafowl

From: Vocal behavior of Crested Guineafowl (Guttera edouardi) based on visual and sound playback surveys in the Umhlanga Lagoon Nature Reserve, KwaZulu-Natal province, South Africa

   Alarm call Staccato Tonal syllable Tremolo Twit
Frequency 95 % Number of exemplars (n) 31 16 11 21 8
  Number of months sampled 13 9 3 5 5
  Mean 5965.79 7030.29 2411.53 5137 2584.68
  SD 1062.62 1488.71 616.26 1404.8 134.86
  Range 4306–8441 4651–10335.9 1722–3273 3270–6718 2411.7–2756
Frequency 5 % Number of exemplars (n) 31 16 11 21 8
  Number of months sampled 13 9 3 5 5
  Mean 1077.8 2239.07 1988.6 2012.31 1614.85
  SD 440.08 2775.48 2775.48 523.41 431.18
  Range 172–1722 1033–2411.9 861–1032.6 1894–2756 861.3–2067.2
Frequency bandwidth Number of exemplars (n) 31 16 11 21 8
  Number of months sampled 13 9 3 5 5
  Mean 4942.81 5577.13 1268.36 3027.5 861
  SD 1017.4 1348.64 703.24 1146.66 263
  Range 4942.81–1017.49 5577.13–1348.64 1268.36–703.24 3027.5–1146.66 516.8–1205.8
Rate (syllables /second) Number of exemplars (n) 10 21 NA 2 5
  Number of months sampled 8 10 NA 2 4
  Mean 1.33 22.81 NA 1.47 0.107
  SD 0.79 7.68 NA 0.38 0.034
  Range 0.21–2.8 8–2.5 NA 1.2–1.75 0.064–0.142
Phrase size (syllables/bout) Number of exemplars (n) 23 18 11 1 8
  Number of months sampled 5 10 3 5 5
  Mean 6.18 8.35 1 1 1
  SD 4.15 2.6 0 0 0
  Range 2–17 6–13 0 0 0
  1. Not assessed (NA) = rate of tonal syllables was intermittent; Frequency 95 % (the frequency that divides the selection into two frequency intervals 95 % and 5 % of the energy in the selection); Frequency 5 % (the frequency that divides the selection into two frequency intervals 5 % and 95 % of the energy in the selection). Frequency bandwidth is the difference between Frequency 95 % and Frequency 5 %. Phrase size = syllables in a bout