Carotenoid composition of invertebrates consumed by two insectivorous bird species.
Dietary carotenoids are important pigments, antioxidants, and immune-stimulants for birds. Despite recent interest in carotenoids in bird ecology, we know surprisingly little about the carotenoid content of invertebrates consumed by birds. We compared carotenoid (lutein, beta-carotene, and total) concentrations in invertebrates brought to nestlings by two insectivorous passerines, the great tit, Parus major and the pied flycatcher, Ficedula hypoleuca. We also compared carotenoid levels between environments that were either polluted by heavy metals or were not polluted, because the carotenoid-based plumage color of P. major nestlings is affected by environmental pollution. Lepidopterans were the most carotenoid-rich food items and contained the largest proportion of lutein. There were no differences in carotenoid concentrations in the food items of the two bird species but P. major nestlings obtained more carotenoids from their invertebrate diet than F. hypoleuca nestlings because the P. major diet had a higher proportion of lepidopteran larvae. In polluted areas, P. major nestlings consumed lower levels of dietary carotenoids than in unpolluted areas because of temporal differences in caterpillar abundance between polluted and unpolluted sites. Our study suggests that pollution-related difference in nestling plumage color in P. major is related to varying dietary proportion of lutein-rich food items rather than pollution-related variation in insect carotenoid levels.
Eeva
Tapio
T
Section of Ecology, University of Turku, FI-20014, Turku, Finland. tapio.eeva@utu.fi
Helle
Samuli
S
Salminen
Juha-Pekka
JP
Hakkarainen
Harri
H
D000818:Animals; D000975:Antioxidants / Q000032:analysis*; D001717:Birds / Q000502:physiology*; D002338:Carotenoids / Q000032:analysis*; D004785:Environmental Pollutants / Q000737:chemistry / Q000633:toxicity; D020387:Food Chain; D007448:Invertebrates / Q000737:chemistry*; D014975:Lutein / Q000032:analysis; D019216:Metals, Heavy / Q000633:toxicity; D019207:beta Carotene / Q000032:analysis
D000975:Antioxidants; D004785:Environmental Pollutants; D019216:Metals, Heavy; D019207:beta Carotene; D002338:Carotenoids; D014975:Lutein
J Exp Biol. 2006 Mar;209(Pt 6):1004-15
16513926
FASEB J. 1990 Sep;4(12):2969-77
2394316
Annu Rev Nutr. 1986;6:273-97
3524619
Oecologia. 2005 Oct;145(4):629-39
16044352
J Agric Food Chem. 2008 Dec 10;56(23):11300-5
18998697
Sci Total Environ. 2008 Nov 15;406(1-2):247-55
18789813
Comp Biochem Physiol C Toxicol Pharmacol. 2006 Oct;144(2):166-72
17035099
Ecohealth. 2008 Sep;5(3):328-37
18704585
Stat Med. 2009 Jan 30;28(2):205-20
18991332
Comp Biochem Physiol B Biochem Mol Biol. 2005 Oct;142(2):245-50
16129640
Oecologia. 1994 Aug;98(3-4):379-384
28313915