Baculum morphology predicts reproductive success of male house mice under sexual selection

Table 2 Paternity success of male house mice

Fixed effects	Estimate (SE)	tvalue	P-value	ΔAIC	Random effects	Variance (SD)
Model for average number of offspring per litter
Intercept	−22.51 (3.61)	−6.23	-	-	Sibling group	1.80 (1.34)
Body mass	6.07 (1.13)	5.37	<0.001	-	Population	0.10 (0.31)
Baculum shaft width	9.35 (4.25)	2.20	0.013	4.19
Baculum base width	8.50 (2.06)	4.13	0.020	3.42

Linear mixed model to investigate morphological traits influencing the reproductive success of male house mice, showing the best model for the average number of offspring sired per litter. Data for morphological traits were log transformed prior to analysis. Body mass was retained in the model as a covariate. Population and sibling group were included as random effects (see text for further details). ΔAIC = the change in the AIC if the single term is dropped. Number of observations = 19, sibling groups = 11, populations = 4.

ISSN: 1741-7007