Table 1.

The structure of Generalized Linear Models used to investigate the effects of sex, size (carapace length, CL mm) and infestation intensity on the number of avoiding, retreating, threatening and fighting behaviours performed by Xironogiton victoriensis (Annelida: Clitellata) infested signal crayfish (Pacifastacus leniusculus)

Dependent variable	Independent variables	Significant terms	Deviance	Df	P
No. of avoid behaviours	Sex, Size (CL mm), Infestation Intensity, Total Behaviours	Sex	129.54	1,24	<0.01
		Size (CL mm)	116.20	1,24	0.03
		Total Behaviours	212.15	1,24	<0.0001
	Sex, Size (CL mm), Total Behaviours	Sex	129.54	1,24	<0.01
		Size (CL mm)	116.20	1,24	0.03
		Total Behaviours	212.15	1,24	<0.0001
	Sex, Infestation Intensity, Total Behaviours	Sex	119.80	1,24	0.03
		Infestation Intensity	116.20	1,24	0.05
		Total Behaviours	195.88	1,24	<0.0001
No. of retreat behaviours	Sex, Size (CL mm), Infestation Intensity, Total Behaviours	Total Behaviours	219.89	1,26	<0.0001
	Sex, Size (CL mm), Total Behaviours	Total Behaviours	219.89	1,26	<0.0001
	Sex, Infestation Intensity, Total Behaviours	Total Behaviours	219.89	1,26	<0.0001
No. of threat behaviours	Sex, Size (CL mm), Infestation Intensity, Total Behaviours	Infestation Intensity	200.31	1,25	<0.01
	Sex, Size (CL mm), Total Behaviours	Sex	200.31	1,25	0.05
	Sex, Infestation Intensity, Total Behaviours	Infestation Intensity	200.31	1,25	<0.01
No. of fight behaviours	Sex, Size (CL mm), Infestation Intensity, Total Behaviours	Nothing	N/A	N/A	N/A
	Sex, Size (CL mm), Total Behaviours	Nothing	N/A	N/A	N/A
	Sex, Infestation Intensity, Total Behaviours	Nothing	N/A	N/A	N/A

For significant terms (P ≤ 0.05) the deviance, degrees of freedom (df) and P-values are reported. In each model, the total number of all types of behaviours performed by crayfish was also included as a controlling variable, which was retained in the final refined models (after stepwise deletions of non-significant terms based on Analysis of Variance) even if not significant