Grentzmann Ilona P, Gauthier Gilles, Angelier Frédéric, Bêty Joël, LeTourneux Frédéric, Legagneux Pierre
Département de Biologie and Centre d'études nordiques, Pavillon Vachon Université Laval Québec Québec Québec Canada.
Centre d'Études Biologiques de Chizé Centre National de Recherche scientifique Chizé France.
Ecol Evol. 2025 Jul 27;15(7):e71812. doi: 10.1002/ece3.71812. eCollection 2025 Jul.
The stress response is a mechanism to cope with unpredictable events and minimize immediate threats to survival. However, cumulated stress due to multiple stressors can have long-term deleterious effects on fitness by impairing reproduction and survival. This aspect of stress physiology and its consequences on demographic traits have received little attention in wild populations, and such studies are mostly observational. Here, we investigate the demographic consequences of multiple stressors (fasting and prolonged captivity) experimentally imposed during spring migration on greater snow geese (). In 2009, female snow geese were captured at a spring staging site and kept in captivity for up to 4 days with or without access to food. Blood samples were taken at capture, banding, and release to measure corticosterone (CORT) levels, a stress-response hormone, during the experiment. CORT response peaked within the first hours after capture and decreased during the following days in captivity. We observed that stress-induced CORT levels of captive individuals at release depended on their pre-experiment body condition, but not the stress-induced peak CORT response. We showed no link with subsequent reproductive success, but we detected a negative carry-over effects of food deprivation on survival in the following year. Pre-treatment spring body condition and stress-induced CORT levels had marginal effects on survival. We showed that cumulated stressors could have carry-over effects on survival and that the intensity of the hormonal response can ultimately affect survival.
应激反应是一种应对不可预测事件并将对生存的直接威胁降至最低的机制。然而，多种应激源导致的累积应激可能会通过损害繁殖和生存能力，对健康产生长期有害影响。应激生理学的这一方面及其对种群统计学特征的影响在野生种群中很少受到关注，此类研究大多是观察性的。在此，我们通过实验研究了春季迁徙期间施加的多种应激源（禁食和长期圈养）对大雪雁的种群统计学影响。2009年，在一个春季停歇地捕获雌性雪雁，并将其圈养长达4天，期间有的可以获取食物，有的不能获取食物。在捕获、佩戴脚环和放归时采集血样，以测量实验期间作为应激反应激素的皮质酮（CORT）水平。CORT反应在捕获后的最初几个小时内达到峰值，并在随后的圈养期间下降。我们观察到，放归时圈养个体的应激诱导CORT水平取决于其实验前的身体状况，而不是应激诱导的CORT峰值反应。我们没有发现其与随后的繁殖成功率有联系，但我们检测到食物剥夺对次年的生存有负面的遗留效应。预处理时的春季身体状况和应激诱导的CORT水平对生存有轻微影响。我们表明，累积应激源可能对生存有遗留效应，并且激素反应的强度最终可能影响生存。
