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Table 1 Results of beta-binomial mixed models for effects of baculum size (length, shaft width and base width) or morphometrics (relative warps 1 & 2 (RW)) on fertilization success of the first male relative to the second male (P1), including body mass and genotype as covariates

From: The baculum affects paternity success of first but not second males in house mouse sperm competition

Model Variable Estimate Std. error z value p-value p-adj
Baculum size
resid. df = 27
Intercept 1.38 0.43 3.19 0.001 0.007
Length M1 0.17 0.38 0.44 0.660 0.724
Shaft width M1 1.66 0.53 3.12 0.002 0.007
Base width M1 0.32 0.28 1.11 0.267 0.367
Length M2 − 0.53 0.37 − 1.42 0.154 0.243
Shaft width M2 − 0.62 0.42 − 1.47 0.141 0.243
Base width M2 − 0.10 0.28 − 0.35 0.7244 0.724
Body mass M1 0.37 0.36 1.03 0.303 0.371
Body mass M2 0.91 0.36 2.53 0.011 0.031
Genotype M1 and M2 (+ /t) − 2.40 0.58 4.15 < 0.001 < 0.001
  Plug removal (removed) − 0.98 0.54863 − 1.796 0.07257 0.160
Baculum shape (morphometrics)
resid. df = 25
Intercept 1.02 0.47 2.17 0.030 0.166
log10 Centroid size M1 0.15 0.37 0.41 0.684 0.912
RW1 M1 0.66 0.39 1.71 0.088 0.322
RW2 M1 − 0.11 0.35 − 0.31 0.754 0.912
log10 Centroid size M2 0.007 0.52 0.01 0.989 0.989
RW1 M2 − 0.19 0.37 − 0.53 0.596 0.912
RW2 M2 − 0.29 0.32 − 0.91 0.361 0.795
Body mass M1 − 0.15 0.40 − 0.389 0.699 0.912
Body mass M2 0.51 0.46 1.10 0.271 0.746
Genotype M1 and M2 (+ /t) − 2.77 0.83 − 3.35 < 0.001 0.009
  Plug removal (removed) − 0.12 0.54 − 0.22 0.829 0.912
  1. M1/M2 = first/second-to-mate male