Skip to main content

Table 1 General Linear Mixed Model results for the effects of group size (nominal factor) and density (continuous factor) on mating behaviour and fitness components.

From: Population density and group size effects on reproductive behavior in a simultaneous hermaphrodite

Parameters df Type III SS F P R 2
Mate encounter rate (per individual & day)    
   Full model (linear) 7 3208.68 16.36 < 0.001 0.63
   Group size 2 1554.93 27.75 < 0.001  
   Density 1 1134.29 40.49 < 0.001  
   Run 4 479.22 4.28 0.004  
   Error 66 1848.92    
log Mating rate (per individual & day)    
   Full model (linear) 7 4.16 4.05 < 0.001 0.30
   Group size 2 0.17 0.56 0.57  
   Density 1 0.41 2.82 0.10  
   Run 4 3.52 6.00 < 0.001  
   Error 66 9.69    
Average egg mass weight      
   Full model (quadratic) 8 2347.63 3.60 0.002 0.31
   Group size 2 4.47 0.03 0.97  
   Density 1 112.08 1.38 0.24  
   (Density)2 1 1189.43 14.61 < 0.001  
   Run 4 1162.98 3.57 0.01  
   Error 65 5291.15    
Total egg mass weight per individual    
   Full model (linear) 7 10019.56 9.21 < 0.001 0.49
   Group size 2 235.63 0.76 0.47  
   Density 1 12.34 0.08 0.78  
   Run 4 9772.64 15.72 < 0.001  
   Error 66 10254.59    
N egg masses per individual      
   Full model (linear) 7 49.08 17.97 < 0.001 0.66
   Group size 2 0.53 0.68 0.51  
   Density 1 0.04 0.11 0.74  
   Run 4 48.44 31.03 < 0.001  
   Error 66 25.75    
  1. Significant P-values are indicated in bold. Note that interaction terms with P ≥ 0.25 were removed from the analysis (see Material and Methods for details).