title: Self-supplementation and effects of dietary antioxidants during acute thermal stress.
abstract: Thermal stress leads to increased production of reactive oxygen species. If an organism is not able to simultaneously mount an efficient antioxidant defense system, this may lead to increased oxidative damage, which is potentially deleterious in terms of health and fitness. Exposure to cold or heat is therefore expected to be associated with a high demand for antioxidants. In agreement, several studies have shown that supplementing the diet of thermally stressed organisms with antioxidants leads to a reduction of oxidative damage. However, whether organisms can actively supplement their diet with antioxidants to alleviate temperature-induced oxidative damage is unknown. Here, we show that captive Gouldian finches (Erythrura gouldiae) supplement their diet more with seeds rich in antioxidants below than within their thermoneutral zone. Moreover, having access to seeds rich in antioxidants at temperatures below thermoneutrality decreases their oxidative damage. These results indicate that, when facing a thermal challenge, animals are able to take advantage of the antioxidant properties of their food to improve their oxidative balance. Having access to food resources rich in antioxidants may therefore be of primary importance for organisms in their natural habitat, as it may help them to cope with oxidative constraints due to challenging temperature regimes.
authors.affiliation: Faculty of Biology, University of Freiburg, Department of Evolutionary Biology and Animal Ecology, Hauptstrasse 1, 79104 Freiburg, Germany.
authors.forename: Michaël
authors.initials: M
authors.lastname: Beaulieu
authors.forename: Anabel
authors.initials: A
authors.lastname: Haas
authors.forename: H Martin
authors.initials: HM
authors.lastname: Schaefer
mesh_terms: D000818:Animals; D000975:Antioxidants / Q000378:metabolism*; D004032:Diet; D005247:Feeding Behavior; D005260:Female; D046369:Finches / Q000502:physiology*; D008297:Male; D018384:Oxidative Stress; D017382:Reactive Oxygen Species / Q000378:metabolism; D013312:Stress, Physiological; D013696:Temperature
chemical_list: D000975:Antioxidants; D017382:Reactive Oxygen Species
keywords: Antioxidants; Birds; Diet; Feeding behavior; Temperature