Table 1

Orientation data of three groups of 12 birds, recorded under various intensities of blue, turquoise or green light

424 nm Blue
 502 nm Turquoise
 565 nm Green

Intensity
 axr
 axb
 med rb
 αN
 rN
 axr
 axb
 med rb
 αN
 rN
 axr
 axb
 med rb
 αN
 rN
8·1015 qu/s m2
 11
 17
 0.92
 8°
 0.76***
 6
 8
 0.94
 5°
 0.96***
 8
 17
 0.89
 9°
 0.91***
36·1015 qu/s m2
 17
 33
 0.61
 3°–183°
 0.69**
 50
 50
 0.96
 98°–278°
 0.61**
 19
 33
 0.72
 (55°–235°)
 0.27n.s.
54·1015 qu/s m2
 31
 58
 0.73
 (19°–199°)
 0.39ns
 8
 8
 0.92
 5°
 0.89***
 28
 33
 0.70
 102°–282°
 0.70**
72·1015 qu/s m2
 25
 67
 0.77
 6°–186°
 0.60**
 6
 33
 0.85
 13°
 0.93***
 19
 83
 0.88
 19°–199°
 0.68**

axr, axb, percentage of axial recordings, and axial mean vectors of birds, respectively (both as defined in text); med rb, median vector length of the individual birds, representing the intra-individual variance; αN, rN, grand mean vector or axis (non-significant axes in parentheses), with asterisks at rN indicating significance by the Rayleigh test: n.s., not significant; * P < 0.05; ** P < 0.01 and *** P < 0.001.

Wiltschko et al. Frontiers in Zoology 2007 4:5   doi:10.1186/1742-9994-4-5