Laboratoire Fonctionnement et Evolution des Systèmes Ecologiques, UMR 7625, Université Pierre et Marie Curie, 7, quai Saint-Bernard, 75005 Paris, France.
Gen Comp Endocrinol. 2010 Mar 1;166(1):142-51. doi: 10.1016/j.ygcen.2009.11.008. Epub 2009 Nov 16.
Stressful events typically induce glucocorticoid production that suppresses unnecessary physiological and behavioural functions. The glucocorticoid production also temporally activates alternative behavioural and physiological pathways. These responses are generally adaptive changes to avoid the negative effects of stressors. However, under low food availability, these behavioural and physiological modifications might lead to energetic costs. We therefore predict that these responses should not be activated when there are energetic constraints (e.g., low food availability). We experimentally tested whether food deprivation modifies corticosterone-induced behavioural and physiological responses in captive male common lizards. We measured corticosterone-induced responses in terms of body mass, metabolic rate, activity level and basking behaviour. We found that corticosterone-induced various behavioural and physiological responses which were dependent on food availability. Well-fed lizards treated with corticosterone were active earlier, and increased their basking behaviour. These behavioural modifications did not occur in food-deprived lizards. This inactivation of stress-related behavioural changes probably allows the lizard to save energy.
应激事件通常会诱导糖皮质激素的产生，从而抑制不必要的生理和行为功能。糖皮质激素的产生也会暂时激活替代的行为和生理途径。这些反应通常是适应性的变化，以避免应激源的负面影响。然而，在食物供应不足的情况下，这些行为和生理的改变可能会导致能量消耗。因此，我们预测，在存在能量限制（例如，食物供应不足）的情况下，这些反应不应该被激活。我们通过实验测试了食物剥夺是否会改变圈养雄性普通蜥蜴中皮质酮诱导的行为和生理反应。我们测量了皮质酮诱导的体重、代谢率、活动水平和晒背行为的反应。我们发现，皮质酮诱导的各种行为和生理反应取决于食物的可利用性。用皮质酮处理的食物充足的蜥蜴会更早地活跃起来，并增加它们的晒背行为。这些行为的改变在食物匮乏的蜥蜴中没有发生。这种与应激相关的行为变化的失活可能使蜥蜴能够节省能量。
