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Table 1 Summary of parameters associated with males, prey, and background noise vibrations on webs of Latrodectus hesperus (top) and Tegenaria agrestis (bottom)

From: A meal or a male: the ‘whispers’ of black widow males do not trigger a predatory response in females

  Male Prey Background
  Abdomen tremulation Walking Bundling silk Cutting All Cricket Fly  
Dominant frequency (Hz) 43.38 (26.78) 55.38 (31.65) 36.58 (16.9) 36.6 (16.77) 52.34 (25.28) 31.82 (16.29) 28.57 (17.41) 32.63 (16.41)
Bandwidth (Hz) 43.38 (29.42) 44.73 (39.85) 44.96 (71.56) 4.1 (2.79) 74.8 (75.5) 45.4 (34.57) 54.73 (53.02)  
RMS amplitude (mm/s) 0.46 (0.61) 1.53 (0.94) 1.32 (0.87) 3.73 (3.09) 0.60 (0.34) 0.88 (0.83) 3.27 (2.59) 0.03 (0.01)
Max amplitude (mm/s) 1.85 (2.35) 14.44 (11.73) 6.04 (4.05) 17.91 (10.66) 6.27 (4.42) 7.58 (8.71) 21.25 (15.72) 0.10 (0.04)
A.M.F 3.91 (1.20) 14.69 (12.08) 8.12 (5.55) 11.50 (6.75) 9.65 (9.55) 33.78 (33.16) 51.56 (48.07)  
Duration (s) 6.45 (3.0) 8.06 (4.12) 8.59 (4.31) 1.0 (0.04) 9.31 (2.43) 1.38 (1.0) 2.01 (0.8)  
n 17 18 4 4 16 16 16 48
  Palp drumming Walking, drumming tapping Jerk Stretch All Cricket Fly  
Dominant frequency (Hz) 32.83 (19.91) 40.64 (18.56) 50.88 (8.85) 54.46 (25.79) 44.31 (20.08) 45.88 (28.11) 40.57 (39.01) 34.14 (20.58)
Band-width (Hz) 92.63 (63.35) 71.38 (18.75) 63.35 (18.96) 107.31 (113.6) 65.34 (21.54) 105.18 (85.82) 54.39 (38.77)  
RMS amplitude (mm/s) 0.21 (0.16) 2.19 (1.98) 3.52 (4.63) 4.05 (3.88) 0.86 (0.58) 0.42 (0.30) 1.81 (2.22) 0.02 (0.01)
Max amplitude (mm/s) 1.36 (1.04) 20.37 (19.41) 19.13 (25.91) 28.54 (30.11) 8.27 (5.86) 2.92 (2.21) 7.06 (6.0) 0.05 (0.02)
A.M.F 5.37 (2.91) 29.95 (17.88) 10.34 (3.72) 7.49 (5.46) 14.49 (14.85) 23.04 (34.13) 34.29 (42.0)  
Duration (s) 7.25 (3.39) 9.62 (3.17) 1.58 (1.20) 1.43 (1.24) 6.35 (2.73) 1.44 (0.47) 2.59 (1.12)  
n 10 13 6 9 16 16 16 38
  1. Means are in bold face and standard deviations are in parentheses.