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Keywords: carotenoids
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Journal Articles
J Exp Biol (2021) 224 (9): jeb241349.
Published: 4 May 2021
...Chloe Peneaux; Gabriel E. Machovsky-Capuska; John A. Endler; Andrea S. Griffin ABSTRACT Producing colored signals often requires consuming dietary carotenoid pigments. Evidence that food deprivation can reduce coloration, however, raises the question of whether other dietary nutrients contribute...
Includes: Supplementary data
Journal Articles
J Exp Biol (2019) 222 (11): jeb205229.
Published: 10 June 2019
...Ismael Galván; Khaled Murtada; Alberto Jorge; Ángel Ríos; Mohammed Zougagh ABSTRACT Pigments are largely responsible for the appearance of organisms. Most biological pigments derive from the metabolism of shikimic acid (melanins), mevalonic acid (carotenoids) or levulinic acid (porphyrins), which...
Journal Articles
J Exp Biol (2016) 219 (19): 3091–3099.
Published: 1 October 2016
... expression of ornamental traits (darkened bills and red back feathers) is positively associated with age and circulating androgen titres, (2) females have the capacity to express most male-typical traits in response to exogenous T, including carotenoid-pigmented body plumage, shorter feathers, darkened bill...
Includes: Supplementary data
Journal Articles
J Exp Biol (2014) 217 (9): 1478–1484.
Published: 1 May 2014
...Viviana Marri; Heinz Richner Oxidative stress is the imbalance between the production of reactive species and antioxidants, which causes damage to lipids, proteins and DNA. Antioxidants, like vitamins and carotenoids, can limit oxidative damage and can therefore regulate the trade-off between...
Journal Articles
J Exp Biol (2013) 216 (14): 2632–2640.
Published: 15 July 2013
... stage (e.g. entering the adult reproduction stage), we must carefully examine the degree to which developmental versus adult conditions shape performance of the immune system. We investigated how variation in dietary access to carotenoid pigments – a class of molecules with immunostimulatory properties...
Journal Articles
J Exp Biol (2010) 213 (13): 2225–2233.
Published: 1 July 2010
...Peeter Hõrak; Elin Sild; Ursel Soomets; Tuul Sepp; Kalle Kilk SUMMARY Carotenoid and melanin pigments in the plumage of birds are hypothesized to be sensitive to oxidative stress. We manipulated oxidative status of captive greenfinches ( Carduelis chloris L.) by the administration of buthionine...
Includes: Supplementary data
Journal Articles
J Exp Biol (2010) 213 (10): 1685–1690.
Published: 15 May 2010
... greater for low-quality than for high-quality individuals. Given the physiological functions of carotenoids, carotenoid-based ornaments could indicate individual immunocompetence, and possibly the ability to mount an immune response at a lower cost. We evaluated whether the red carotenoid-based coloration...
Journal Articles
J Exp Biol (2009) 212 (12): 1811–1818.
Published: 15 June 2009
...-mail: m.l.roberts@imperial.ac.uk ) 28 3 2009 © The Company of Biologists Limited 2009 2009 testosterone blue tit condition immunity PHA SRBC carotenoids protein A key assumption of the immunocompetence handicap hypothesis (ICHH)( Folstad and Karter, 1992 )that the male sex hormone...
Journal Articles
J Exp Biol (2009) 212 (8): 1225–1233.
Published: 15 April 2009
...Geoffrey E. Hill; Wendy R. Hood; Kristal Huggins SUMMARY It has been well established that carotenoid and melanin pigmentation are often condition-dependent traits in vertebrates. Expression of carotenoid coloration in birds has been shown to reflect pigment intake, food access and parasite load...
Journal Articles
J Exp Biol (2008) 211 (17): 2859–2864.
Published: 1 September 2008
... ). Carotenoid availability in diet and phenotype of blue and great tit nestlings. J. Exp. Biol. 209 , 1004 -1015. Blount, J. D. and Matheson, S. M. ( 2006 ). Effects of carotenoid supply on escape flight responses in zebra finches, Taeniopygia guttata. Anim. Behav. 72 , 595 -601. Collins...
Journal Articles
J Exp Biol (2008) 211 (8): 1257–1261.
Published: 15 April 2008
...Mats Olsson; Mark Wilson; Caroline Isaksson; Tobias Uller; Beth Mott SUMMARY We performed experiments on male Australian painted dragon lizards( Ctenophorus pictus ) to test the hypothesis that carotenoids can scavenge reactive oxygen species (ROS), protecting the organism from oxidative stress...
Journal Articles
J Exp Biol (2007) 210 (20): 3571–3578.
Published: 15 October 2007
... the health properties of carotenoid pigments, carotenoid-based ornaments offer a relevant context in which to investigate the effect of environmental stress, such as ambient temperature, on the production and maintenance of secondary sexual traits and, also, to explore the proximate mechanisms shaping...
Journal Articles
J Exp Biol (2006) 209 (22): 4414–4419.
Published: 15 November 2006
...Sophie Bertrand; Bruno Faivre; Gabriele Sorci SUMMARY Carotenoid-based signals are thought to be indicators of male quality because they must be obtained from the diet and might thus indicate the ability of individuals to gather high-quality food. However, carotenoids are also known to have...