Food supplementation and testosterone interact to influence reproductive behavior and immune function in Sceloporus graciosus.
Food supplementation and testosterone interact to influence reproductive behavior and immune function in Sceloporus graciosus.
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DOI：
10.1016/j.yhbeh.2009.09.019
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发表时间：
2010-02
影响因子：
3.5
通讯作者：
Martins EP
中科院分区：
文献类型：
--
作者：
Ruiz M;French SS;Demas GE;Martins EP
有机体环境中的能量资源对于执行广泛的生命史功能（包括免疫和繁殖）至关重要。然而，大多数精力充沛的预算都是有限的，这可能导致竞争功能之间的权衡。在许多情况下，增加繁殖努力往往会降低免疫力；通过补充喂养增加总能量可以消除这种影响。睾酮（T）是生殖的重要调节剂，因此，食物供应都是调节生命史过程的潜在因素，但它们经常被单独测试。在这项研究中，我们考虑了食物供应量和 T 升高对山艾蜥蜴 Sceloporus graciosus 免疫功能和繁殖行为的影响，以评估 T 和能量供应如何影响这些权衡。我们通过实验控制自然群体中雄性的饮食（通过补充喂养）和 T（通过皮肤贴片）。我们通过计算收集的血浆暴露于离体大肠杆菌的细菌杀灭能力来确定先天免疫反应。我们通过计算 20 分钟采样周期内产生的求偶展示次数来测量生殖行为。我们观察到食物供应和 T 型贴片对免疫功能的交互影响，食物补充剂可提高 T 型贴片蜥蜴的免疫力。此外，T 还增强了对照食物蜥蜴的求爱表现。补充食物的蜥蜴的循环 T 值高于对照组。总的来说，这项研究表明，动物的能量状态在调节山艾蜥蜴和其他可能物种的 T、行为和免疫之间的相互作用方面发挥着关键作用。
The energetic resources in an organism’s environment are essential for executing a wide range of life history functions, including immunity and reproduction. Most energetic budgets, however, are limited, which can lead to trade-offs among competing functions. Increasing reproductive effort tends to decrease immunity in many cases; and increasing total energy via supplemental feedings can eliminate this effect. Testosterone (T), an important regulator of reproduction, and food availability are thus both potential factors regulating life-history processes, yet they are often tested in isolation of each other. In this study, we considered the effect of both food availability and elevated T on immune function and reproductive behavior in sagebrush lizards, Sceloporus graciosus, to assess how T and energy availability affect these trade-offs. We experimentally manipulated diet (via supplemental feedings) and T (via dermal patches) in males from a natural population. We determined innate immune response by calculating the bacterial killing capability of collected plasma exposed to E. coli ex vivo. We measured reproductive behavior by counting the number of courtship displays produced in a 20-min sampling period. We observed an interactive effect of food availability and T-patch on immune function, with food supplementation increasing immunity in T-patch lizards. Additionally, T increased courtship displays in control food lizards. Lizards with supplemental food had higher circulating T than controls. Collectively, this study shows that the energetic state of the animal plays a critical role in modulating the interactions among T, behavior and immunity in sagebrush lizards and likely other species.
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