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The Effects of Dietary Carotenoid Supplementation and Retinal Carotenoid Accumulation on Vision-Mediated Foraging in the House Finch

Figure 6

Retinal carotenoid levels and low contrast foraging performance.

Relative number of food pellets eaten in the low-contrast red-light, as compared to high-contrast full-light, in the post-supplementation period for (A) experiment one, (B) experiment two, and (C) experiments one and two combined. The diet treatments within experiments one and two are denoted with different symbols. The box plot in at the top of figure C represents the natural range of variation in retinal carotenoid levels among wild house finches reported by Toomey and McGraw [18].

Figure 6

doi: https://doi.org/10.1371/journal.pone.0021653.g006