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Table 2 Mating behaviour and mating position in wild-type D. pachea couples with unmodified males, ‘left lobe cut’ males and ‘left lobe shaved’ males

From: Drosophila pachea asymmetric lobes are part of a grasping device and stabilize one-sided mating

  Unmodified wild-type Left lobe cut Left lobe shaved Wild-type in Lang & Orgogozo 2012 [24] Symmetric mutant in Lang & Orgogozo 2012 [24]
Total number of couples 16 18 18 19 22
Number of couples that failed to copulate 0 1 0 0 8
Number of males that did copulate, but failed to do so at first attempt 0 2 2 0 3
Time until male courtship started [min:sec; mean ± SD] 9:53 ± 13:12 (n = 16) 5:58 ± 9:41 (n = 17) 9:06 ± 14:35 (n = 18) 10:56 ± 26:39 (n = 19) 1:52 ± 1:45 (n = 22)
Duration of male courtship until copulation occurred [min:sec; mean ± SD] 9:38 ± 8:15 (n = 16) 20:18 ± 25:07 (n = 16) 12:13 ± 32:03 (n = 18) 6:15 ± 7:15 (n = 19) 13:30 ± 20:04 (n = 14)
Duration of copulation until female started kicking [min:sec; mean ± SD] 17:11 ± 8:00 (n = 14) 14:21 ± 4:17 (n = 14) 13:28 ± 3:58 (n = 14) not recorded not recorded
Total duration of copulation [min:sec; mean ± SD] 27:38 ± 6:46 (n = 16) 27:35 ± 6:22 (n = 17) 25:28 ± 5:20 (n = 18) 34:55 ± 7:08 (n = 19) 39:55 ± 10:56 (n = 14)
Mating angle at 10–15 min after copulation starts (present study) or at 4–11 min [24] [degree; mean ± SD] 6.06 ± 3.64 (n = 12) −1.98 ± 11.13 (n = 12) 8.87 ± 11.70 (n = 14) 8.55 ± 1.79 (n = 12) 5.77 ± 5.33 (n = 11)
Tilting index at 10–15 min after copulation starts [mean ± SD] 0.960 ± 0.038 (n = 12) 0.880 ± 0.070 (n = 12) 0.909 ± 0.096 (n = 14) not recorded not recorded
Male mortality between date of treatment and date of video recording or snap-freezing (including males used for snap-freezing experiments) 26.9 % (n = 14/52) 18.0 % (n = 9/50) 17.1 % (n = 6/35)   
  1. Data from a previous study [43] are incorporated. Note that courtship time is higher in left lobe cut males than in control males but that this difference is not significant (log-transformed; LM: F 2,47  = 1.70, P = 0.194). Courtship duration is the time interval between the moment of first apparent male courtship behaviour and the moment at which the male mounts the female. SD = standard deviation, n = number of observations