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

Figure 4

Carotenoid supplementation and foraging performance.

Mean ± S.E. change in the number of food pellets eaten by finches in the red-filtered light (solid bars) and the full light (open bars) following eight weeks on a low carotenoid, astaxanthin- (asta) supplemented, or zeaxanthin- (zea) supplemented diet.

Figure 4

doi: https://doi.org/10.1371/journal.pone.0021653.g004