Avian phenotypic transitions; acting constraints, mechanisms and consequences

该计划的长期目标是破译的机制，限制鸟类面临高能量需求的表型灵活性，并确定这些限制健身的后果。在接下来的五年里，我们将专注于与寒冷气候中越冬，迁移和繁殖相关的表型转变。这些生命史阶段涉及脊椎动物中已知最高的能量需求，在鸟类中，被认为是影响身体组成和生理状况的能量瓶颈。更准确地说，我们将（1）确定代谢灵活性的速率和幅度，以响应环境温度的快速变化，并测量与温度变化不匹配的表型的生理后果。第一个项目将在UQAR鸟类设施进行，暴露三个模型物种（黑帽山雀，

The long-term objectives of this program are to decipher the mechanisms that limit phenotypic flexibility in birds facing high energy demands and to determine the consequences of these limits on fitness. Over the next five years, we will focus on phenotypic transitions associated with wintering in cold climates, migration and reproduction. These life-history stages involve energy demands among the highest known in vertebrates and, in birds, are considered energy bottlenecks affecting body composition and physiological condition. More precisely, we will (1) determine the rate and amplitude of metabolic flexibility in response to rapid changes in ambient temperature and measure the physiological consequences of phenotypes mismatched to temperature variations This first project will be conducted at the UQAR avian facility by exposing three models species (black-capped chickadees,