Table 1. Models of 3-week immune function and melatonin.

Generalized linear models exploring the effect of light regimen at the 3-week sampling period on: (A) haemocyte concentration, (B) lytic activity, (C) PO activityand (D) circulating melatonin concentration in adult crickets maintained in either a 12 h light: 12 h dark (LD) or constant light (LL) regimen. Values highlighted in bold are main effects and interactions that are significant (P < 0.05). Haemocyte concentrations, lytic and PO activity were square-root transformed; melatonin concentrations were natural log transformed prior to analysis.

Model parameters	β ± SE	Statistic	P value
(A) 3-week haemocyte concentration (cells/ml × 106)
Whole model		F1,127 = 0.11	0.74
Light regimen		F1,127 = 0.11	0.74
(B) 3-week lytic activity (Δ absorbance)
Whole model		F4,113 = 7.25	<0.001
Light regimen		F1,116 = 7.40	0.008
Sex		F1,116 = 7.23	0.008
Light regimen × Sex		F1,116 = 6.57	0.01
3-week body condition	0.40 ± 0.17	F1,116 = 5.65	0.02
(C) 3-week PO activity (Δ absorbance)
Whole model		F2,127 = 14.99	<0.001
Light regimen		F1,128 = 2.15	0.15
Sex		F1,128 = 14.54	<0.001
(D) Melatonin concentration (pg/mL)
Whole model		F3,26 = 2.43	0.09
Light regimen		F1,26 = 5.07	0.03
Sex		F1,26 = 1.32	0.26
Light regimen∗Sex		F1,26 = 2.83	0.10