Figure 2
From: Background matching and disruptive coloration as habitat-specific strategies for camouflage
Discrimination values (JNDs) for crabs collected from either mudflat (MF) or rock pool (RP) sites (X axis) compared to either mudflat or rock pool backgrounds, corresponding to (a) avian colour, (b) fish colour, (c) avian luminance, and (d) fish luminance vision comparisons. In all cases except (b) crabs are a closer match to mudflat than rock pool substrates, especially when originating from mudflat backgrounds. Plots (e and f) show results from pattern analyses for background matching and disruptive coloration, respectively. For background matching, smaller pattern energy differences (PED) equate to a closer match. Here, mudflat crabs show closer matches (better camouflage) than rock pool crabs to the mudflat substrate. For disruption, larger scores (GabRat) equate to higher disruptive coloration, and here rock pool crabs show greater disruptive coloration than mudflat crabs. Boxplots show average values (bold line), interquartile range (box component), range of minimum and maximum values, and outliers (circles).
