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. 2013 Aug 7;8(8):e71476. doi: 10.1371/journal.pone.0071476

Table 2. Model selection results for the subsets and full dataset examining the influence of anthropogenic noise, artificial night light and weather components on the onset of blackbird dawn song.

Subset Candidate modelsa df K AIC ΔAIC ωi
All data
Noi, Ld, Day, Temp, Cloud, Habitat, Noi*Ld 2613 11 29917.7 0.00 0.43
Noi, Ld, Day, Temp, Cloud, Habitat, Noi*Ld, Cloud*Ld 2612 12 29918.6 1.03 0.26
Noi, Ld, Day, Temp, Cloud, Habitat, Moon, Noi*Ld, 2612 12 29919.3 1.61 0.19
Noi, Ld, Day, Temp, Cloud, Habitat, Moon, Noi*Ld, Cloud*Ld 2611 13 29920.3 2.62 0.12
Centre
Noi, Day, Temp, Cloud, Moon 891 9 9751.7 0.00 0.40
Noi, Ld, Day, Temp, Cloud, Moon 890 10 9751.7 0.04 0.39
Noi, Ld, Day, Temp, Cloud, Moon, Cloud*Ld 889 11 9753.6 1.91 0.15
Noi, Ld, Day, Temp, Cloud, Moon, Noi*Ld, Cloud*Ld 888 12 9755.6 3.90 0.06
Park
Noi, Ld, Day, Temp, Cloud, Noi*Ld, Cloud*Ld 1714 11 19798.8 0.00 0.47
Noi, Ld, Day, Temp, Cloud, Moon, Noi*Ld, Cloud*Ld 1713 12 19799.1 0.34 0.40
Noi, Ld, Day, Temp, Cloud, Noi*Ld 1715 10 19801.3 2.49 0.13

All models contain a correction factor for spatial autocorrelation and a random intercept to account for repeated measures of individual birds.

a

Noi – PCA factor noise, Ld – lamp density, Day – Julian date, Temp – temperature, Cloud – cloud cover, Moon – lunar phase; Habitat – habitat factor.

Model selection was based on Akaike’s information criteria (AIC). The parameter df indicates the residual degrees of freedom, K represents the number of parameters in the candidate model and ΔAIC the difference of AIC values to the top-ranking model. Only candidate models with ΔAIC <4 are presented, because they are considered to receive support, and included to calculate Akaike weights (ωi).