The effects of dietary carotenoid supplementation and retinal carotenoid accumulation on vision-mediated foraging in the house finch.
The effects of dietary carotenoid supplementation and retinal carotenoid accumulation on vision-mediated foraging in the house finch.
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饮食中的类胡萝卜素补充和视网膜类胡萝卜素积累对视力介导的觅食的影响。
DOI：
10.1371/journal.pone.0021653
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发表时间：
2011
期刊：
影响因子：
3.7
通讯作者：
McGraw KJ
中科院分区：
文献类型：
--
作者：
Toomey MB;McGraw KJ
对于许多鸟类来说，视觉是用来定位和评估食物的主要感觉方式。鸟类视觉系统的健康和光谱敏感性受到在视网膜中积累的饮食来源的类胡萝卜素色素的影响。在野生的家雀（Carpodacus mexicanus），我们发现，视网膜类胡萝卜素的积累显着不同的个人和饮食类胡萝卜素的摄入量。如果饮食引起的视网膜类胡萝卜素积累的变化改变光谱灵敏度，那么它们有可能影响视觉介导的觅食性能。在两个实验中，我们测量了觅食性能的家雀与饮食操纵视网膜类胡萝卜素水平。我们测试了每只鸟在高对比度（全）和较暗的低对比度（红色过滤）照明条件下从不可食用的干扰物矩阵中提取视觉对比食物的能力。在实验一中，玉米黄质补充鸟类视网膜类胡萝卜素水平显着增加，但下降觅食性能在高对比度条件下相对于虾青素补充鸟类，没有表现出视网膜类胡萝卜素积累的变化。在实验一和二结合，我们发现，视网膜类胡萝卜素浓度预测相对觅食性能在低对比度的光条件下，曲线图案。在具有低至中等积累水平（0.5-1.5 µg/视网膜）的鸟类中，性能与视网膜类胡萝卜素积累呈正相关，但在具有非常高水平（>2.0 µg/视网膜）的鸟类中下降。我们的研究结果表明，类胡萝卜素介导的光谱过滤增强了颜色辨别力，但这种改善与灵敏度的降低相权衡，而灵敏度的降低可能会损害视觉辨别力。因此，可以优化视网膜类胡萝卜素水平以满足特定行为任务和光环境的视觉需求。
For many bird species, vision is the primary sensory modality used to locate and assess food items. The health and spectral sensitivities of the avian visual system are influenced by diet-derived carotenoid pigments that accumulate in the retina. Among wild House Finches (Carpodacus mexicanus), we have found that retinal carotenoid accumulation varies significantly among individuals and is related to dietary carotenoid intake. If diet-induced changes in retinal carotenoid accumulation alter spectral sensitivity, then they have the potential to affect visually mediated foraging performance. In two experiments, we measured foraging performance of house finches with dietarily manipulated retinal carotenoid levels. We tested each bird's ability to extract visually contrasting food items from a matrix of inedible distracters under high-contrast (full) and dimmer low-contrast (red-filtered) lighting conditions. In experiment one, zeaxanthin-supplemented birds had significantly increased retinal carotenoid levels, but declined in foraging performance in the high-contrast condition relative to astaxanthin-supplemented birds that showed no change in retinal carotenoid accumulation. In experiments one and two combined, we found that retinal carotenoid concentrations predicted relative foraging performance in the low- vs. high-contrast light conditions in a curvilinear pattern. Performance was positively correlated with retinal carotenoid accumulation among birds with low to medium levels of accumulation (∼0.5–1.5 µg/retina), but declined among birds with very high levels (>2.0 µg/retina). Our results suggest that carotenoid-mediated spectral filtering enhances color discrimination, but that this improvement is traded off against a reduction in sensitivity that can compromise visual discrimination. Thus, retinal carotenoid levels may be optimized to meet the visual demands of specific behavioral tasks and light environments.
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影响因子：
6.1
作者：
ENDLER, JA
通讯作者：
ENDLER, JA
影响因子：
2.9
作者：
Aviles, Jesus M.;Perez-Contreras, Tomas;Soler, Juan J.
通讯作者：
Soler, Juan J.
DOI：
10.1007/s00359-005-0024-2
发表时间：
2005-10-01
影响因子：
2.1
作者：
Goldsmith, TH;Butler, BK
通讯作者：
Butler, BK
DOI：
10.1007/s00359-001-0240-3
发表时间：
2001-11-01
影响因子：
2.1
作者：
Hart, NS
通讯作者：
Hart, NS
影响因子：
2.9
作者：
Osorio, D;Smith, AC;Buchanan-Smith, HM
通讯作者：
Buchanan-Smith, HM