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Table 3 Dependence of female insemination probability and fecundity upon size, male competition level and strain.*

From: Behavioural determinants of gene flow in malaria vector populations: Anopheles gambiae males select large females as mates

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

  1. * 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).