Need and seek for dietary micronutrients: endogenous regulation, external signalling and food sources of carotenoids in new world vultures.

Only two correlations among carotenoids from wild condors did not reach statistical significance (both involving echinenone correlations with other xanthophylls, r ≤0.39, P≥0.075, n = 22), while all relationships were positive and significant in captive condors (all r ≥0.54, all P<0.006, n = 24; three captive individuals in which we did not detect plasma carotenoids were excluded from the analysis).

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