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Table 1 Orientation data of three groups of 12 birds, recorded under various intensities of blue, turquoise or green light

From: Light-dependent magnetoreception in birds: increasing intensity of monochromatic light changes the nature of the response

  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 0.76*** 6 8 0.94 0.96*** 8 17 0.89 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 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**
  1. 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.