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Table 1.

Homing performance and global homing success in plugged nostrils experiments

Day after the release
N/ATreatment0123LaterLostTotalGHS
Common diving petrel b/n Control 
  unplugged nostrils  
  plugged nostrils 0.57* 
Madeiran storm petrel b/n Control 0.83 
  unplugged nostrils  
  plugged nostrils 0* 
Wilson's storm petrel b/n Control 0.93 
  unplugged nostrils 10 11 11  
  plugged nostrils 0.33** 
Thin-billed prion b/n Control 
  unplugged nostrils  
  plugged nostrils 0*** 
Bulwer's petrel b/n Control 
  unplugged nostrils 12 14 15 15  
  plugged nostrils 
Cory's shearwater subsp. borealis b/d Control 
  unplugged nostrils  
  plugged nostrils 
Cape petrel s/d Control 
  unplugged nostrils  
  plugged nostrils 0.57 
Snow petrel b/d Control 0.90 
  unplugged nostrils 10 11 11  
  plugged nostrils 0.67 
Antarctic fulmar s/d Control 
  unplugged nostrils  
  plugged nostrils 
Day after the release
N/ATreatment0123LaterLostTotalGHS
Common diving petrel b/n Control 
  unplugged nostrils  
  plugged nostrils 0.57* 
Madeiran storm petrel b/n Control 0.83 
  unplugged nostrils  
  plugged nostrils 0* 
Wilson's storm petrel b/n Control 0.93 
  unplugged nostrils 10 11 11  
  plugged nostrils 0.33** 
Thin-billed prion b/n Control 
  unplugged nostrils  
  plugged nostrils 0*** 
Bulwer's petrel b/n Control 
  unplugged nostrils 12 14 15 15  
  plugged nostrils 
Cory's shearwater subsp. borealis b/d Control 
  unplugged nostrils  
  plugged nostrils 
Cape petrel s/d Control 
  unplugged nostrils  
  plugged nostrils 0.57 
Snow petrel b/d Control 0.90 
  unplugged nostrils 10 11 11  
  plugged nostrils 0.67 
Antarctic fulmar s/d Control 
  unplugged nostrils  
  plugged nostrils 

N/A, nest type and activity on land; b=burrow- or crevice-nesting,s=surface nest, n=nocturnal, d=diurnal (from Warham, 1990). GHS, global homing success (one-tailed G-test). *P<0.05, **P<0.01, ***P<0.001.

Asterisks indicate a significant difference between GHS of plugged birds with respect to pooled control and unplugged birds.

For each day values represent numbers of birds present in the nest(cumulative frequency).

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