Table 1.

Summary of the results of post-hoc pairwise tests of the comparison of differences in bird counts between experimental pairs (‘light-on’, ‘light-off’) and control pairs (‘light-off’, ‘light-off’).

Comparisons	Estimate	Odds Ratio	Std. Error	t ratio	P-value
Control vs Bright white	− 0.396	0.673	0.06	− 6.58	< 0.0001***
Control vs Dimmed white	− 0.198	0.82	0.059	− 3.375	0.0102**
Control vs Blue	− 0.212	0.809	0.059	− 3.571	0.0051**
Control vs Green	− 0.218	0.804	0.058	− 3.77	0.0025**
Control vs Red	0.018	1.018	0.06	0.296	0.9997
Bright white vs Dimmed white	0.198	1.219	0.06	3.295	0.0132**
Bright white vs Blue	0.183	1.201	0.061	3.01	0.0324*
Bright white vs Green	0.178	1.195	0.059	2.99	0.0343*
Bright white vs Red	0.414	1.513	0.061	6.735	< 0.0001***
Dimmed white vs Blue	− 0.015	0.985	0.059	− 0.246	0.9999
Dimmed white vs Green	− 0.02	0.98	0.058	− 0.353	0.9993
Dimmed white vs Red	0.216	1.241	0.06	3.598	0.0047**
Blue vs Green	− 0.006	0.994	0.059	− 0.099	1
Blue vs Red	0.23	1.259	0.061	3.788	0.0023**
Green vs Red	0.236	1.266	0.059	3.986	0.0011**

Negative estimates indicate that bird numbers decreased in the presence of illumination compared to control periods. Estimates taken from the GAM (spectra experiment) show log-transformed differences in counted birds. For example, bright white caused a (0.67 – 1) * 100% = -33% decrease in counted birds when we turned on the light compared to control pair (‘light-off’, ‘light-off’). Significant results are marked in bold. ***P < 0.001; **P < 0.01; *P < 0.05.