Table 3.

Major axis regressions for the RGB values of the grasshoppers' dorsal area (Ra, Ga, Ba) as a function of their background (Rb, Gb, Bb), for females and males of S. planum and S. purpurascens

Reflectance regressed parameters	Sex	β	UCL	LCL	r 2	r s	df	p
S. planum
Ra to Rb	Male	0.35	0.66	0.10	0.15	−0.45	41	<.01
	Female	0.87	1.14	0.66	0.65	−0.45	32	.32
Ga to Gb	Male	0.21	0.48	−0.03	0.06
	Female	0.92	1.20	0.69	0.63	−0.11	32	.53
Ba to Bb	Male	0.19	1.31	−0.59	0.01
	Female	0.78	1.23	0.47	0.36	−0.18	32	.28
S. purpurascens
Ra to Rb	Male	0.15	0.30	0.01	0.09	−0.71	42	<.0001
	Female	1.17	1.48	0.94	0.66	0.22	41	.14
Ga to Gb	Male	0.06	0.21	−0.08	0.01
	Female	1.05	1.32	0.83	0.66	0.07	41	.64
Ba to Bb	Male	0.11	0.30	0.34	0.04
	Female	1.29	1.62	1.04	0.68	0.01	41	<.05

Slopes of the regressions (β), Upper (UCL; 97.5%) and Lower (LCL; 2.5%) Confidence Intervals, explained variance (r ²) are shown. In addition, r‐test values (r _s), Degrees of freedom (df), and p values (p) of the analyses to test slopes different from 1 are shown for the regression that was significant. Slopes near 1 (β = 1) between grasshoppers and their background RGB values denote background color matching, which is indicated by no significant differences are in bold.