Table 2.

Details of tortuosity and statistical analyses

Tunnel width (cm)	Condition			Tortuosity median (interquartile range)	Wilcoxon statistics (a vs. b; **b vs. c; *a vs. c)
	Floor		Walls
60	a	White	Dead leaves	1.036 (1.020–1.052)	Z = 8.2, p < 0.001
	b	Dead leaves	Dead leaves	1.010 (1.006–1.018)
120	a	White	Dead leaves	1.020 (1.011–1.036)	Z = −5.8, p < 0.001
	b	Dead leaves	Dead leaves	1.008 (1.004–1.016)
180	a	White	Dead leaves	1.024 (1.013–1.052)	Z = 7.7, p < 0.001
	b	Dead leaves	Dead leaves	1.006 (1.002–1.014)	Z** = 4.7, p < 0.001
	c	Dead leaves	Grey	1.014 (1.006–1.024)	Z* = −4.4, p < 0.001
240	a	White	Dead leaves	1.022 (1.008–1.043)	Z = 3.3, p < 0.001
	b	Dead leaves	Dead leaves	1.013 (1.005–1.027)

Data from the condition with a patterned floor and patterned walls (b) are re-analysed from Linander et al. (2016)

* White floor and patterned walls vs. patterned floor and grey walls (a vs. c)

** Patterned floor and patterned walls vs. patterned floor and grey walls (b vs. c)