Table 3.

Dependence of female insemination probability and fecundity upon size, male competition level and strain.^*

Experiment	N	Outcome	Parameter	β ± SEM	P
Ifakara strain only
1 & 2	91	Oviposition†	Intercept	-16.5± 5.6	<0.001
			Size	5.4 ± 1.8	0.001
			Competition	-1.44 ± 0.59	0.009
2	46	Insemination†	Intercept	-38.1 ± 10.7	<0.001
			Size	13.1 ± 3.7	<0.001
			Competition	1.91 ± 1.0	0.034
		Oviposition after insemination†	Intercept	0.15 ± 0.56	0.782
			Competition	-1.95 ± 0.95	0.024
All four male-female combinations of Ifakara and Mbita strains
3	180	Insemination†	Intercept	-13.0 ± 3.4	<0.001
			Competition	2.37 ± 0.38	<0.001
			Size	3.98 ± 1.12	<0.001
	180	Oviposition†	Intercept	-10.2 ± 3.1	0.001
			Competition	1.83 ± 0.34	<0.001
			Size	3.06 ± 1.01	0.003
	94	Oviposition after insemination†	Intercept	2.52 ± 0.39	<0.001
	87	Egg batch size of ovipositors‡	Intercept	-1.16 ± 0.47	0.017
			Size	0.94 ± 0.15	<0.001

^* Size was measured as wing length (mm) and male competition was either low or high (5 versus 50 males per cage, respectively, with 30 females). † Logistic regression model fitted by forward conditional stepwise selection ‡ Generalized linear model fitted manually including only terms found to be significant upon testing all candidates. The size of egg batches was log-normally distributed and correspondingly transformed so parameter estimates refer to their influence upon Log ₁₀ (egg batch size +1).