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Table 2.

Summary of the parameters obtained from linear mixed-effect models in R(v2.01) with and without seal Q included

AICL.RatioSlopeP
With Q:     
   Full model 1037.75    
   Term removed:     
      PER 1037.3 1.55  0.213 
      Mass 1080.05 44.30 –0.0058±0.001 <0.0001 
      Distance 80   –0.2731±0.025  
 1155.64 121.89  <0.0001 
      Distance 120   –0.2463±0.029  
      Individual   0.5820±0.124 <0.0001 
Without Q:     
   Full model 642.68    
   Term removed:     
      PER 641.57 0.89  0.344 
      Mass 641.50 0.82  0.365 
      Distance 80   –0.3592±0.030  
 808.36 169.69  <0.0001 
      Distance 120   –0.3830±0.032  
      Individual   0.2539±0.033 <0.0001 
AICL.RatioSlopeP
With Q:     
   Full model 1037.75    
   Term removed:     
      PER 1037.3 1.55  0.213 
      Mass 1080.05 44.30 –0.0058±0.001 <0.0001 
      Distance 80   –0.2731±0.025  
 1155.64 121.89  <0.0001 
      Distance 120   –0.2463±0.029  
      Individual   0.5820±0.124 <0.0001 
Without Q:     
   Full model 642.68    
   Term removed:     
      PER 641.57 0.89  0.344 
      Mass 641.50 0.82  0.365 
      Distance 80   –0.3592±0.030  
 808.36 169.69  <0.0001 
      Distance 120   –0.3830±0.032  
      Individual   0.2539±0.033 <0.0001 

Seal ID (see text) and prey encounter rate (PER) were included as random effects; distance, mass and PER as fixed effects; the index was the response variable. The significance of a parameter was tested by removing each parameter from the full model and looking at the effect of the deletion on the fit of the model using likelihood ratio tests. The slope values ±s.e.m. are given for significant terms (in bold)

AIC, Akaike information criterium; L.ratio, likelihood ratio test

TBF, total body fat; DLV, diving lung volume

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