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Table 2.

Orientation experiments with juvenile European robins tested under different wavelengths and intensities of light during autumn migration

ExperimentNα-α2 (deg.)95% CI (deg.)r, r2PMean number of registrations ± S.D.Mean individual vector length ± S.D.Number of axial individuals (% of active and valid experiments)Total number of experiments/inactive/invalid experiments
W1 ac 19 244-64  0.13 0.738 550.6±960.8 0.16±0.10 4(21) 41/21/1 
W10 ac 18 41-221  0.34 0.132 1067.2±889.4 0.16±0.10 5(28) 38/17/3 
W20 bc 29 282 ±43 0.34 0.035 1074.4±782.9 0.16±0.12 6(21) 50/20/1 
W20 ac 14 229  0.30 0.298 1383.6±1289.3 0.13±0.07 4(29) 41/23/4 
G1 21 215 ±33 0.49 0.005 1162.5±999.4 0.17±0.12 5(24) 41/18/2 
G5 19 214-34 ±43 0.41 0.037 688.6±916.4 0.18±0.14 5(26) 42/23/0 
G10 18 216-36  0.40 0.054 1130.8±1294.0 0.15±0.10 5(28) 40/21/1 
GY1 15 74  0.23 0.465 941.1±782.8 0.16±0.14 6(40) 44/24/5 
GY5 20 177  0.29 0.193 1021.2±993.9 0.18±0.14 3(15) 43/21/2 
GY10 22 238  0.30 0.133 1223.0±1122.6 0.17±0.13 3(14) 42/20/0 
R1 21 277 ±20 0.71 <0.001 951.0±626.8 0.14±0.09 6(29) 42/20/1 
R5 17 259 ±40 0.46 0.026 899.5±670.3 0.16±0.06 4(24) 44/27/0 
R10 18 315  0.34 0.123 1021.0±684.6 0.18±0.08 3(17) 42/23/1 
ExperimentNα-α2 (deg.)95% CI (deg.)r, r2PMean number of registrations ± S.D.Mean individual vector length ± S.D.Number of axial individuals (% of active and valid experiments)Total number of experiments/inactive/invalid experiments
W1 ac 19 244-64  0.13 0.738 550.6±960.8 0.16±0.10 4(21) 41/21/1 
W10 ac 18 41-221  0.34 0.132 1067.2±889.4 0.16±0.10 5(28) 38/17/3 
W20 bc 29 282 ±43 0.34 0.035 1074.4±782.9 0.16±0.12 6(21) 50/20/1 
W20 ac 14 229  0.30 0.298 1383.6±1289.3 0.13±0.07 4(29) 41/23/4 
G1 21 215 ±33 0.49 0.005 1162.5±999.4 0.17±0.12 5(24) 41/18/2 
G5 19 214-34 ±43 0.41 0.037 688.6±916.4 0.18±0.14 5(26) 42/23/0 
G10 18 216-36  0.40 0.054 1130.8±1294.0 0.15±0.10 5(28) 40/21/1 
GY1 15 74  0.23 0.465 941.1±782.8 0.16±0.14 6(40) 44/24/5 
GY5 20 177  0.29 0.193 1021.2±993.9 0.18±0.14 3(15) 43/21/2 
GY10 22 238  0.30 0.133 1223.0±1122.6 0.17±0.13 3(14) 42/20/0 
R1 21 277 ±20 0.71 <0.001 951.0±626.8 0.14±0.09 6(29) 42/20/1 
R5 17 259 ±40 0.46 0.026 899.5±670.3 0.16±0.06 4(24) 44/27/0 
R10 18 315  0.34 0.123 1021.0±684.6 0.18±0.08 3(17) 42/23/1 

N, number of active and valid experiments;α-α2, mean group direction for unimodally (α) and axially (α2) oriented groups, respectively; 95% CI, 95%confidence interval (directed groups only); r, r2, mean vector length of the unimodally (r) and axially (r2)oriented groups; P, level of significance according to the Rayleigh test; bc, before colour experiments; ac, after colour experiments; W,full-spectrum light; G, green light; GY, green-yellow light; R, red light. Also given are the mean number of registrations, mean individual vector length and number of axial individuals per group (valid experiments only), and the total number of experiments performed under each experimental situation and the number of inactive (>40 registrations) and invalid (mean individual vector length <0.05) experiments. See Figs 3, 4.

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