Authors: Ruiz, Mayté; Wang, Danfeng; Reinke, Beth A.; Demas, Gregory E.; Martins, Emília P.

Source: The Herpetological Journal, Volume 21, Number 2, April 2011 , pp. 131-134(4)

Publisher: British Herpetological Society

Abstract:

Trade-offs between immune function and reproduction are common to many organisms. Nevertheless, high energetic resources may eliminate the need for these trade-offs. In this study, we consider the effects of food availability on these trade-offs in a wild population of female sagebrush lizards (Sceloporus graciosus) during the breeding season. We manipulated food availability by supplementing some lizards but not others. We measured female orange side coloration as an indicator of reproductive state and calculated the bacterial killing capability of collected plasma exposed to Escherichia coli ex vivo as a measure of innate immunity. We found that female lizards show a natural trade-off between reproductive effort and immune function; females under high reproductive investment had lower innate immunity than those at a later reproductive state. We did not detect this trade-off with food supplementation. We show that trade-offs depend on the energetic state of the animal, illustrating that trade-offs between immune function and reproduction can be context-dependent.

Keywords: CONTEXT-DEPENDENT; ENERGETICS; LIFE HISTORY; RESOURCES

Document Type: Research article

Publication date: 2011-04-01

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• The Herpetological Journal is an international scientific journal that publishes papers on the natural history of amphibians and reptiles. Experimental, observational and theoretical studies are published along with reviews and book reviews. Faunistic lists, letters and results of general surveys are not published unless they shed light on herpetological problems of wider significance.
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