The Effects of Dietary Carotenoid Supplementation and Retinal Carotenoid Accumulation on Vision-Mediated Foraging in the House Finch
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{"title"=>"The effects of dietary Carotenoid supplementation and retinal carotenoid accumulation on vision-mediated foraging in the house finch", "type"=>"journal", "authors"=>[{"first_name"=>"Matthew B.", "last_name"=>"Toomey", "scopus_author_id"=>"34573521300"}, {"first_name"=>"Kevin J.", "last_name"=>"McGraw", "scopus_author_id"=>"7004407439"}], "year"=>2011, "source"=>"PLoS ONE", "identifiers"=>{"scopus"=>"2-s2.0-79959659436", "sgr"=>"79959659436", "issn"=>"19326203", "doi"=>"10.1371/journal.pone.0021653", "pmid"=>"21747917", "isbn"=>"1932-6203 (Electronic)\\r1932-6203 (Linking)", "pui"=>"362031231"}, "id"=>"6b546170-d7db-3346-a425-1eb1b9c99539", "abstract"=>"BACKGROUND: 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.\\n\\nMETHODOLOGY/PRINCIPAL FINDINGS: 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).\\n\\nCONCLUSION/SIGNIFICANCE: 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.", "link"=>"http://www.mendeley.com/research/effects-dietary-carotenoid-supplementation-retinal-carotenoid-accumulation-visionmediated-foraging-h", "reader_count"=>43, "reader_count_by_academic_status"=>{"Unspecified"=>1, "Professor > Associate Professor"=>3, "Student > Doctoral Student"=>3, "Researcher"=>7, "Student > Ph. D. Student"=>14, "Student > Postgraduate"=>1, "Student > Master"=>4, "Other"=>5, "Student > Bachelor"=>5}, "reader_count_by_user_role"=>{"Unspecified"=>1, "Professor > Associate Professor"=>3, "Student > Doctoral Student"=>3, "Researcher"=>7, "Student > Ph. D. Student"=>14, "Student > Postgraduate"=>1, "Student > Master"=>4, "Other"=>5, "Student > Bachelor"=>5}, "reader_count_by_subject_area"=>{"Engineering"=>3, "Unspecified"=>2, "Environmental Science"=>1, "Agricultural and Biological Sciences"=>34, "Medicine and Dentistry"=>1, "Social Sciences"=>1, "Computer Science"=>1}, "reader_count_by_subdiscipline"=>{"Engineering"=>{"Engineering"=>3}, "Medicine and Dentistry"=>{"Medicine and Dentistry"=>1}, "Social Sciences"=>{"Social Sciences"=>1}, "Agricultural and Biological Sciences"=>{"Agricultural and Biological Sciences"=>34}, "Computer Science"=>{"Computer Science"=>1}, "Unspecified"=>{"Unspecified"=>2}, "Environmental Science"=>{"Environmental Science"=>1}}, "reader_count_by_country"=>{"Netherlands"=>1, "Romania"=>1, "United States"=>2, "United Kingdom"=>1, "Italy"=>1}, "group_count"=>0}

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Figshare

  • {"files"=>["https://ndownloader.figshare.com/files/760502"], "description"=>"<p>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.</p>", "links"=>[], "tags"=>["supplementation", "foraging"], "article_id"=>430883, "categories"=>["Neuroscience", "Medicine", "Ecology", "Evolutionary Biology"], "users"=>["Matthew B. Toomey", "Kevin J. McGraw"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0021653.g004", "stats"=>{"downloads"=>1, "page_views"=>3, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Carotenoid_supplementation_and_foraging_performance_/430883", "title"=>"Carotenoid supplementation and foraging performance.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2011-06-29 00:14:43"}
  • {"files"=>["https://ndownloader.figshare.com/files/382288", "https://ndownloader.figshare.com/files/382364"], "description"=>"<div><h3>Background</h3><p>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 (<em>Carpodacus mexicanus</em>), 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.</p> <h3>Methodology/Principal Findings</h3><p>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).</p> <h3>Conclusion/Significance</h3><p>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.</p> </div>", "links"=>[], "tags"=>["effects", "dietary", "carotenoid", "supplementation", "retinal", "accumulation", "vision-mediated", "foraging", "finch"], "article_id"=>135524, "categories"=>["Neuroscience", "Medicine", "Ecology", "Evolutionary Biology"], "users"=>["Matthew B. Toomey", "Kevin J. McGraw"], "doi"=>["https://dx.doi.org/10.1371/journal.pone.0021653.s001", "https://dx.doi.org/10.1371/journal.pone.0021653.s002"], "stats"=>{"downloads"=>13, "page_views"=>8, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/The_Effects_of_Dietary_Carotenoid_Supplementation_and_Retinal_Carotenoid_Accumulation_on_Vision_Mediated_Foraging_in_the_House_Finch/135524", "title"=>"The Effects of Dietary Carotenoid Supplementation and Retinal Carotenoid Accumulation on Vision-Mediated Foraging in the House Finch", "pos_in_sequence"=>0, "defined_type"=>4, "published_date"=>"2011-06-29 01:32:04"}
  • {"files"=>["https://ndownloader.figshare.com/files/760410"], "description"=>"<p>Mean ± S.E. concentration of the six carotenoid types in retinas of female finches receiving a low-carotenoid (open bars) or zeaxanthin-supplemented (solid bars) diet in experiment two. *indicate significant treatment differences.</p>", "links"=>[], "tags"=>["carotenoid", "levels"], "article_id"=>430793, "categories"=>["Neuroscience", "Medicine", "Ecology", "Evolutionary Biology"], "users"=>["Matthew B. Toomey", "Kevin J. McGraw"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0021653.g002", "stats"=>{"downloads"=>1, "page_views"=>5, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Retinal_carotenoid_levels_in_experiment_two_/430793", "title"=>"Retinal carotenoid levels in experiment two.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2011-06-29 00:13:13"}
  • {"files"=>["https://ndownloader.figshare.com/files/760548"], "description"=>"<p>Mean ± S.E. number of seeds dyed each of four colors eaten during the 20 min food preference trial. Diet treatments are denoted with different symbols.</p>", "links"=>[], "tags"=>["preferences", "carotenoid-supplemented"], "article_id"=>430926, "categories"=>["Neuroscience", "Medicine", "Ecology", "Evolutionary Biology"], "users"=>["Matthew B. Toomey", "Kevin J. McGraw"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0021653.g005", "stats"=>{"downloads"=>1, "page_views"=>5, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Food_color_preferences_of_carotenoid_supplemented_birds_/430926", "title"=>"Food color preferences of carotenoid-supplemented birds.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2011-06-29 00:15:26"}
  • {"files"=>["https://ndownloader.figshare.com/files/760655"], "description"=>"a<p>>1 jnd difference between lighting conditions (<i>p</i><0.001) for both vision models.</p>b<p>>1 jnd difference between lighting conditions (<i>p</i> = 0.007) for bright vision model only.</p>c<p>>1 jnd difference between food/distracter contrast and distracter/distracter contrast (<i>p</i><0.001) in both vision models.</p>", "links"=>[], "tags"=>["irradiance", "contrasts", "pellets", "distracters", "illumination", "modeled", "assuming", "dim"], "article_id"=>431024, "categories"=>["Neuroscience", "Medicine", "Ecology", "Evolutionary Biology"], "users"=>["Matthew B. Toomey", "Kevin J. McGraw"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0021653.t001", "stats"=>{"downloads"=>0, "page_views"=>1, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Total_irradiance_and_predicted_visual_contrasts_between_food_pellets_and_background_distracters_under_experimental_illumination_modeled_assuming_either_bright_or_dim_photon_noise_limited_conditions_/431024", "title"=>"Total irradiance and predicted visual contrasts between food pellets and background distracters under experimental illumination modeled assuming either bright or dim (photon-noise limited) conditions.", "pos_in_sequence"=>0, "defined_type"=>3, "published_date"=>"2011-06-29 00:17:04"}
  • {"files"=>["https://ndownloader.figshare.com/files/760460"], "description"=>"<p>Mean ± S.E. number of food pellets eaten by male and female house finches in experiment one, and by female house finches in experiment two under high-contrast full-light vs. low-contrast red-light conditions.</p>", "links"=>[], "tags"=>["ecology", "neuroscience", "Evolutionary biology", "nutrition"], "article_id"=>430837, "categories"=>["Neuroscience", "Medicine", "Ecology", "Evolutionary Biology"], "users"=>["Matthew B. Toomey", "Kevin J. McGraw"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0021653.g003", "stats"=>{"downloads"=>1, "page_views"=>1, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Foraging_performance_under_experimental_lighting_conditions_/430837", "title"=>"Foraging performance under experimental lighting conditions.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2011-06-29 00:13:57"}
  • {"files"=>["https://ndownloader.figshare.com/files/760372"], "description"=>"<p>(A) Absorbance spectra of single-cone photoreceptors before (gray lines) and after (black lines) carotenoid-pigmented cone oil-droplet filtering. Spectral sensitivities are based upon measures from the canary (<i>Serinus canaria</i>; <a href=\"http://www.plosone.org/article/info:doi/10.1371/journal.pone.0021653#pone.0021653-Das1\" target=\"_blank\">[28]</a>), the house finch's closest relative for which these values are known. Microspectorphotometric studies <a href=\"http://www.plosone.org/article/info:doi/10.1371/journal.pone.0021653#pone.0021653-Goldsmith1\" target=\"_blank\">[10]</a> suggest that the long-wavelength-sensitive cone (LWS) is filtered by an oil droplet pigmented with astaxanthin, the medium-wavelength-sensitive cone (MWS) is filtered by a zeaxanthin-pigmented oil droplet, the short-wavelength-sensitive cone (SWS) is filtered by a galloxanthin-containing oil droplet, and the ultraviolet-sensitive cone (UVS) has a transparent oil droplet. (B) Normalized absorbance spectra of carotenoids found in the house finch retina: astaxanthin (asta), galloxanthin (gal), zeaxanthin (zea), lutein (lut), and ε-carotene (ε-car). (C) Sample irradiance spectra from the full and red-filtered room lights and reflectance spectra of the food pellets and distracters. Irradiance spectra are presented in gray and are associated with the y-axis on the left. Reflectance spectra are presented in black and associated with the y-axis on the right.</p>", "links"=>[], "tags"=>["carotenoid", "pigment", "absorbance", "irradiance", "spectra"], "article_id"=>430742, "categories"=>["Neuroscience", "Medicine", "Ecology", "Evolutionary Biology"], "users"=>["Matthew B. Toomey", "Kevin J. McGraw"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0021653.g001", "stats"=>{"downloads"=>0, "page_views"=>0, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_A_comparison_of_carotenoid_and_visual_pigment_absorbance_spectra_food_and_background_reflectance_and_irradiance_spectra_of_the_experimental_lighting_/430742", "title"=>"A comparison of carotenoid and visual pigment absorbance spectra, food and background reflectance, and irradiance spectra of the experimental lighting.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2011-06-29 00:12:22"}
  • {"files"=>["https://ndownloader.figshare.com/files/760599"], "description"=>"<p>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 <a href=\"http://www.plosone.org/article/info:doi/10.1371/journal.pone.0021653#pone.0021653-Toomey3\" target=\"_blank\">[18]</a>.</p>", "links"=>[], "tags"=>["carotenoid", "levels", "foraging"], "article_id"=>430971, "categories"=>["Neuroscience", "Medicine", "Ecology", "Evolutionary Biology"], "users"=>["Matthew B. Toomey", "Kevin J. McGraw"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0021653.g006", "stats"=>{"downloads"=>0, "page_views"=>3, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Retinal_carotenoid_levels_and_low_contrast_foraging_performance_/430971", "title"=>"Retinal carotenoid levels and low contrast foraging performance.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2011-06-29 00:16:11"}

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Relative Metric

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