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Table 3 Correlation of genital morphology with mating angle and tilting index, at 10–15 min after the start of copulation

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

Treatment   Mating angle Tilting index
Unmodified wild-type (n = 11) Left epandrial lobe length ρ = −0.02, P > 0.5 ρ = −0.15, P > 0.5
Right epandrial lobe length ρ = 0.78, P = 0.007 ρ = 0.32, P = 0.341
Sum of left and right lobe lengths ρ = 0.33, P = 0.327 ρ = 0.29, P = 0.386
Ratio of left and right lobe lengths ρ = −0.54, P = 0.089 ρ = −0.30, P = 0.369
Tibia length ρ = −0.03, P > 0.5 ρ = 0.51, P = 0.094
Unmodified wild-types from present study combined with data from [24] (n = 23) Left epandrial lobe length ρ = 0.06, P > 0.5 not recorded by Lang & Orgogozo (2012)
Right epandrial lobe length ρ = 0.36, P = 0.088
Sum of left and right lobe lengths ρ = 0.17, P = 0.445
Ratio of left and right lobe lengths ρ = −0.26, P = 0.222
Left lobe cut (n = 12) Left epandrial lobe length ρ = 0.38, P = 0.218 ρ = 0.22, P = 0.500
Right epandrial lobe length ρ = −0.29, P = 0.366 ρ = −0.34, P = 0.276
Sum of left and right lobe length ρ = 0.28, P = 0.379 ρ = 0.13, P > 0.5
Ratio of left and right lobe lengths ρ = 0.47, P = 0.128 ρ = 0.34, P = 0.287
Tibia length ρ = 0.33, P = 0.297 ρ = 0.39, P = 0.210
Left lobe shaved (n = 14) Left epandrial lobe length ρ = −0.50, P = 0.069 ρ = 0.19, P > 0.5
Right epandrial lobe length ρ = −0.41, P = 0.146 ρ = 0.26, P = 0.365
Sum of left and right lobe lengths ρ = −0.49, P = 0.081 ρ = 0.31, P = 0.281
Ratio of left and right lobe lengths ρ = 0.18, P > 0.5 ρ = −0.20, P = 0.482
Tibia length ρ = −0.08, P > 0.5 ρ = 0.20, P > 0.5
  1. Spearman’s correlation coefficients and associated P-values are presented for five explanatory variables