Joint Evolution of Energetics, Behaviour and Performance in Wild Mice

野生小鼠能量、行为和表现的联合进化

• 批准号: RGPIN-2016-04418
• 负责人: Careau, Vincent
• 金额: $ 2.4万
• 依托单位: University of Ottawa
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2017
• 资助国家: 加拿大
• 起止时间: 2017-01-01 至 2018-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=631867
• 关键词: Joint; Evolution; Energetics; Behaviour; Performance

In humans and non-human animals, there are large and consistent among-individual differences in physiology, behaviour, and physical ability (performance). Although individual variation is commonly viewed as the raw material upon which natural selection acts, it can also be the result of selection itself because alternative strategies are commonly favoured within a population. For example, different trait combinations can result in equivalent reproductive success due to environmental heterogeneity over space and time. While predictable or stable environments favour individuals who adopt a “slow” pace of life (i.e., late maturation, small litters, long life), unpredictable or unstable environments favour individuals who adopt a “fast” pace of life (i.e., early maturation, large litters, short life). In turn, variation along a “slow-fast” continuum should affect suites of co-adapted metabolic, behavioural, and performance traits that jointly evolve to support different paces of life. Although co-adaptation is a key concept in evolution and can potentially explain how individual differences are generated and maintained, empirical studies showing co-adaptation are scarce. The goal of this proposal is to test for co-adaptation among metabolic, behavioural, and performance traits along the slow-fast pace of life continuum. To do so, we will quantify how natural selection acts on various metabolic, behavioural, performance, and life-history traits as well as quantify the multivariate quantitative genetic architecture of these traits. Specifically, we will conduct a long-term, individual-based study of wild white-footed mice, a relatively common, well studied, and easy to capture North American rodent. We will install nest boxes which mice will use as daytime refuges and for nesting during reproduction. Regular visits of these nest boxes, in combination with live trapping and genetic analyses, will allow precise quantification of survival and reproductive success. Moreover, individuals will be recaptured several times throughout their lives to quantify different aspects of their phenotypes, such as basal metabolic rate, aerobic capacity, sprint speed, endurance, agility, activity, boldness, and exploratory behaviour. The resulting dataset will allow testing whether these traits are 1) under correlational selection, which would favour co-adaptation, and 2) functionally integrated (genetic covariance), which would indicate co-adaptation. In doing so, this research program will not only have a significant impact on our understanding of how co-variation among complex traits is maintained, but will also offer a unique environment for training young scientists in a wide range of disciplines with different techniques valuable for jobs in academia, environmental consultancy, veterinary sciences, wildlife biology, conservation, nature museums, and parks.

在人类和非人类动物中，在生理、行为和身体能力（表现）方面存在巨大且一致的个体差异。虽然个体变异通常被视为自然选择作用的原材料，但它也可能是选择本身的结果，因为替代策略通常在种群中受到青睐。例如，不同的性状组合可以导致相同的繁殖成功，由于环境异质性在空间和时间。虽然可预测或稳定的环境有利于采用“慢”生活节奏的人（即，成熟晚、窝仔小、寿命长），不可预测或不稳定的环境有利于采用“快”生活节奏的个体（即，早熟、窝仔数多、寿命短）。反过来，沿着“慢-快”连续体的变化沿着应该会影响一套共同适应的代谢、行为和表现特征，这些特征共同进化以支持不同的生活节奏。虽然共同适应是进化中的一个关键概念，可以解释个体差异是如何产生和维持的，但实证研究表明共同适应是稀缺的。这个提议的目的是测试代谢，行为和性能性状之间的协同适应沿着慢-快生活节奏连续体。为此，我们将量化自然选择如何作用于各种代谢，行为，性能和生活史特征，以及量化这些特征的多变量定量遗传结构。具体来说，我们将对野生白足鼠进行长期的、以个体为基础的研究，这是一种相对常见、研究充分、易于捕获的北美啮齿动物。我们将安装巢箱，小鼠将使用作为白天的避难所和繁殖期间的筑巢。定期访问这些巢箱，结合现场诱捕和遗传分析，将允许精确量化的生存和繁殖成功。此外，个体将在其一生中多次被重新捕获，以量化其表型的不同方面，例如基础代谢率，有氧能力，短跑速度，耐力，敏捷性，活动，大胆和探索行为。由此产生的数据集将允许测试这些性状是否1）在相关选择下，这将有利于共同适应，以及2）功能整合（遗传协方差），这将表明共同适应。在这样做的过程中，这项研究计划不仅将对我们理解复杂性状之间的共变如何保持产生重大影响，而且还将提供一个独特的环境，为培训年轻科学家提供各种学科的不同技术，这些技术对学术界，环境咨询，兽医科学，野生动物生物学，保护，自然博物馆和公园的工作有价值。