RUI: Hormonal and Body Condition Effects on Natal Dispersal in Birds: Tests of a New Model

RUI：荷尔蒙和身体状况对鸟类出生传播的影响：新模型的测试

• 批准号: 9509079
• 负责人: James Belthoff
• 金额: $ 16.5万
• 依托单位: Boise State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1995
• 资助国家: 美国
• 起止时间: 1995-08-15 至 1998-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9509079&HistoricalAwards=false
• 关键词: RUI; Hormonal; Body; Condition; Effects

9509079 Natal dispersal, the movement from place of birth to location of first breeding, occurs in virtually all higher vertebrates. These movements have important implications for population regulation, mating systems, genetics, and conservation biology. The goal of this project is to understand the physiological ecology of natal dispersal movements in birds. A new model of dispersal, based on interactions among hormonal changes, body condition, and social stimuli, will be tested using both captive and free-living birds. The model predicts that level of corticosterone, a hormone known to stimulate increased locomotor and foraging activity, increases prior to dispersal due to a combination of endogenous and external events. This stimulates the locomotor activity that underlies dispersal behavior, and juveniles with sufficient fat reserves will disperse at that time. Birds in poor body condition will delay dispersing, but will increase their foraging activity. Dispersal of their siblings will reduce aggression and/or competition for food, enabling the remaining juveniles to improve their body condition and disperse. To test this model, hormone profiles of captive birds will be manipulated and their subsequent activity levels examined in relation to timing of dispersal. A second set of experiments will examine the relationship between corticosterone and timing of dispersal movements by free-living juvenile birds. These experiments will determine how activity levels, body condition, and hormones interact to control natal dispersal. This study will provide significant new insight into the factors controlling natal dispersal. The results will provide a basis for future studies of hormones and dispersal in vertebrates, and may be of applied value in managing the dispersal of species whose management is important.

9509079纳塔尔分散，从出生地点到第一次繁殖的位置的运动发生在几乎所有较高的脊椎动物中。 这些运动对人口调节，交配系统，遗传学和保护生物学具有重要意义。该项目的目的是了解鸟类源源生物运动的生理生态学。 基于荷尔蒙变化，身体状况和社交刺激之间相互作用的新模型将使用圈养和自由生活的鸟类进行测试。 该模型预测，由于内源性事件和外部事件的结合，在分散之前，皮质酮的水平是一种刺激运动和觅食活性的激素水平。 这刺激了构成分散行为的运动活性，当时具有足够的脂肪储量的少年将分散。 身体状况不佳的鸟类会延迟分散，但会增加其觅食活动。 分散兄弟姐妹将减少食物的侵略性和/或竞争，使剩下的少年能够改善其身体状况和分散。 为了测试该模型，将操纵圈养鸟类的激素谱，并根据分散时间进行检查。 第二组实验将检查皮质酮与自由生活的少年鸟类的分散运动时间之间的关系。 这些实验将决定活性水平，身体状况和激素如何相互作用以控制出生的分散。 这项研究将为控制出生扩散的因素提供重大的新见解。结果将为脊椎动物中激素和分散的未来研究提供基础，并且可能在管理管理很重要的物种的扩散方面具有应用价值。