TABLE 2.

Pairwise contrasts of fish pattern luminance contrast (mean contrast of edges in LEIA) expressed as the response ratio between the acclimation and the first experimental background for both scorpionfish species, either pooling all measurements in the first experimental background regardless of background type, or split by background.

	Response ratio	Lower CIs	Upper CIs
Scorpaena maderensis
Acclimation – first experimental background (pooled)	0.80	0.75	0.85
Acclimation – fine	0.77	0.69	0.85
Acclimation – medium	0.83	0.74	0.92
Acclimation – coarse	0.81	0.72	0.91
Scorpaena porcus
Acclimation – first experimental background (pooled)	0.87	0.83	0.92
Acclimation – fine	0.87	0.80	0.95
Acclimation – medium	0.83	0.76	0.91
Acclimation – coarse	0.91	0.83	0.99

Note: Effect size is proportional to the deviation of ratios from one, and the robustness of the result increases with decreasing degree of overlap of the 95% compatibility intervals (CIs) with one. Response ratios with CIs excluding one are highlighted in bold. N = 21 for S. maderensis and N = 30 for S. porcus. $R_{\text{cond}}^2$ = .820, $R_{\text{marg}}^2$ = .254.