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Fig. 1. Male baseline levels of superoxide (bSO) at the end of the carotenoid
experiment and its relationship with head chroma change during the
corresponding time (mean after – before treatment reflectance
measurements; see Materials and methods). Since male natural colour morphs
(red, yellow) differ in these trait values, we used measurements standardised
for natural colour. The relationship was also statistically significant when
we controlled for body condition (r=–0.45, P=0.012,
N=31).