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Fig. 1. The effects of Mycoplasma gallicepticum (MG) infection on
expression of carotenoid plumage coloration in male house finches. Plotted as
horizontal lines are the median and 10th, 25th, 75th and 90th percentiles of
the hue, saturation and brightness. Comparisons were made with the mean color
of the crown, breast and rump feathers for each male following molt within
experimental treatment group. Infected males all had conjunctivitis during the
molt period. Uninfected males tested negative for MG both in antibody tests
and PCR tests at capture and were held in a quarantine facility away from
sources of MG during molt. All birds were fed a low-carotenoid pellet diet and
water supplemented with tangerine juice as a source of carotenoid
pigments.
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