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Table 1.

Orientation of silvereyes before and after treatment with a brief,strong magnetic pulse administered together with a biasing field

PAR birdsANTI birds
NαmrmNαmrmSignificant difference
Control        
Day 1 342° 0.73* 10 8° 0.60* NS 
Day 2 5° 0.62* 11° 0.69* NS 
Day 3 23° 0.85** 352° 0.67* NS 
Day 4 10 11° 0.84** 357° 0.66* NS 
Day 5 22° 0.67° 5° 0.70* NS 
Day 6 6° 0.89** 8° 0.49 NS 
Biasing field 7° 0.92*** 352° 0.66* NS 
After treatment with the pulse in the presence of biasing field:        
Day of treatment 10 95° 0.16 317° 0.45 NS 
Axial:  111-291° 0.59*  94-274° 0.69* NS 
Day after treatment 256° 0.29 254° 0.49 NS 
Axial:  85-265° 0.81**  86-266° 0.82** NS 
PAR birdsANTI birds
NαmrmNαmrmSignificant difference
Control        
Day 1 342° 0.73* 10 8° 0.60* NS 
Day 2 5° 0.62* 11° 0.69* NS 
Day 3 23° 0.85** 352° 0.67* NS 
Day 4 10 11° 0.84** 357° 0.66* NS 
Day 5 22° 0.67° 5° 0.70* NS 
Day 6 6° 0.89** 8° 0.49 NS 
Biasing field 7° 0.92*** 352° 0.66* NS 
After treatment with the pulse in the presence of biasing field:        
Day of treatment 10 95° 0.16 317° 0.45 NS 
Axial:  111-291° 0.59*  94-274° 0.69* NS 
Day after treatment 256° 0.29 254° 0.49 NS 
Axial:  85-265° 0.81**  86-266° 0.82** NS 

N, number of birds producing evaluable recordings.

αm, rm direction and length,respectively, of mean vector; asterisks at rm indicate significance by the Rayleigh test.

NS, not significant; *P<0.05; **P<0.01; ***P<0.001.

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