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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).