Figure 1
From: Experimental manipulation of a signal trait reveals complex phenotype-behaviour coordination
Experimental manipulation of plumage colour affects social interactivity. A male’s change in interactivity with his social mate was strongly predicted by the magnitude of experimental change in ventral plumage colour (β = 0.75, r2 = 0.47, p = 0.007, n = 14). Ventral plumage colour was measured as average breast feather brightness and transformed so a larger value corresponded to a darker bird. A greater change in colour was associated with a larger shift from pale to dark. Black points are manipulated males and grey points are unmanipulated males. Grey points are jittered for clarity.
