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Table 1 Results of the PCA using the four environmental factors

From: Nocturnal resting behaviour in urban great tits and its relation to anthropogenic disturbance and microclimate

  PC1 PC2 PC3 PC4
Standard deviation 1.37 1.09 0.88 0.41
Proportion of variance 0.47 0.30 0.20 0.04
Cumulative proportion 0.47 0.76 0.96 1.00
Noise [dB(A)] 0.47 − 0.22 0.81 − 0.27
Light (lux) − 0.41 0.70 0.26 − 0.52
Temperature (°C) − 0.47 − 0.66 − 0.1 − 0.57
Humidity (%) 0.62 0.13 − 0.52 − 0.57
Eigenvalues 1.87 1.18 0.78 0.17