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Table 3 Model selection table for models relating competitive ability and male morphology

From: Competitive males have higher quality sperm in a monogamous social bee

Selection episode N.obs Response Random effect Starting model Fixed effect removed Degrees of freedom χ2 P-value
Colony -Aggregation 110 Probability of reaching an aggregation colony and malea male size + eye male size 1 0.65 0.42
asymmetry eye asymmetry 1 0.05 0.82
male size male size 1 0.67 0.41
asymmetry asymmetry 1 0.07 0.79
Persistence time in the aggregations 65 Number of days at the aggregation aggregation male size + eye male size 1 4.56 0.03
asymmetry eye asymmetry 1 0.76 0.38
male size male size 1 5.17 0.02
eye asymmetry eye asymmetry 1 1.38 0.24
  1. The p-values and degrees of freedom refer to Likelihood Ratio Tests (using a χ2 test statistic), in which the full model was compared to a reduced model without each of the predictor variables. Parameters estimates of best models are presented in Table 4
  2. aObservation level random effect to account for overdispersion