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Table 2 Principal component analysis on phylogenetically independent contrasts of love-dart and reproductive morphology data.

From: Shooting darts: co-evolution and counter-adaptation in hermaphroditic snails

  Component loadings
Data PC1 PC2 PC3 PC4
Love-dart     
Number of darts 0.807* -0.212 -0.262 0.050
Number of blades 0.492† 0.544 0.303 0.318
Length of blades 0.664* 0.381 0.517 0.158
Curvature 0.534* 0.169 0.127 0.668
Functional stylophore(s)     
Number 0.781* -0.204 -0.379 -0.219
Relative size 0.411† 0.498† -0.447 0.393
Placement on vaginal duct 0.536* 0.053 -0.578 -0.286
Vestigial stylophore(s)     
Number 0.527† -0.775 0.125 0.013
Relative size 0.361† -0.655 0.258 0.180
Placement on vaginal duct 0.527† -0.753 0.165 0.106
Glands     
Number 0.709* -0.339 -0.050 -0.225
Relative size 0.472 0.592 -0.275 -0.089
Type of branching 0.275 0.360 -0.277 0.189
Placement 0.871* -0.133 -0.050 0.258
Diverticulum of spermatophore receiving organ     
Length relative to bursa tract 0.457 0.359 0.216 -0.470
Placement 0.554* 0.308 0.431 -0.342
Relative size 0.184* 0.454 0.303 -0.167
Flagellum     
Relative length 0.614* 0.141 0.138 -0.429
  1. The independent contrasts are based on the trees reconstructed with BI without consideration of five cases of phylogenetic uncertainty. The table shows the loadings for each variable in the different principal components (PC1 to PC4). Collectively the principal components explain over 70% of the total variance in the data set (respectively, 32.5%, 19.3%, 9.6%, and 9.0 %). Tests of significance of variable loadings represent frequency of loadings different in sign to the ones observed, among 1000 bootstrap replicate analyses corrected for axis reversals (*, P < 0.05; †, P < 0.15).