The role of phenotypic plasticity and resource polymorphism on the evolution of fish populations

表型可塑性和资源多态性对鱼类种群进化的作用

• 批准号: RGPIN-2017-06808
• 负责人: Magnan, Pierre
• 金额: $ 2.4万
• 依托单位: Université du Québec à Trois-Rivières
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2022
• 资助国家: 加拿大
• 起止时间: 2022-01-01 至 2023-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=765345
• 关键词: role; phenotypic; plasticity; resource; polymorphism

Understanding the mechanisms underlying species diversification and speciation was first addressed in Darwin's The Origin of Species, and reviews published over the past few years have highlighted that this question is still one the most challenging and exciting issues in evolutionary ecology. It has been shown that plasticity promotes the origin of novel phenotypes through the capacity of single genotypes to produce different phenotypes in response to varying environmental conditions. Phenotypic plasticity has been proposed as a mechanism for the expression of resource polymorphism, i.e., when individuals of the same population exhibit differences in morphology, behaviour, and physiological traits associated with differential niche use. Resource polymorphisms could in turn lead to genetic differentiation and ultimately to adaptive radiation. However, testing these recent theoretical developments in natural systems is still one of the most challenging tasks in evolutionary ecology. The long-term objective of my research program is to study how phenotypic plasticity and resource polymorphism promote adaptive radiation. I use the brook trout, Salvelinus fontinalis, from Canadian Shield lakes as the model species. Brook trout exhibits a subtle resource polymorphism, and our results suggest that these lakes represent the early stages of evolutionary divergence of this species. This makes them of particular interest for understanding the processes involved in the early steps of ecological speciation. The proposed research is built on 15 years of work in this system and will allow us to 1) improve our understanding on the role of temperature in the evolution of resource polymorphism in ectotherms, 2) test the functional relationship between phenotypeenvironment in two discrete ecotypes, and 3) identify the mechanisms underlying the transmission of adaptive traits in fishes. In addition to being done on natural populations, the proposed research projects are conceptually original and will collectively contribute to a better understanding of the mechanisms of adaptive radiation in animals. Furthermore, the proposed research will allow to train two M.Sc. and two Ph.D. candidates as well as 10 research assistants. These students will acquire solid conceptual and practical skills, which are highly sought by employers like public organizations, private industries, and academic institutions.

理解物种多样化和物种形成的机制首先在达尔文的《物种起源》中提出，过去几年发表的评论强调，这个问题仍然是进化生态学中最具挑战性和最令人兴奋的问题之一。已经表明，可塑性通过单个基因型响应于不同环境条件产生不同表型的能力来促进新表型的起源。表型可塑性已被提出作为资源多态性表达的机制，即，当同一种群的个体表现出与不同生态位利用相关的形态、行为和生理特征的差异时。资源多态性反过来又会导致遗传分化，最终导致适应性辐射。然而，在自然系统中测试这些最新的理论发展仍然是进化生态学中最具挑战性的任务之一。我的研究计划的长期目标是研究表型可塑性和资源多态性如何促进适应性辐射。我用溪鳟鱼，红点鲑，从加拿大盾湖作为模式物种。溪鳟表现出微妙的资源多态性，我们的研究结果表明，这些湖泊代表了这个物种的进化分歧的早期阶段。这使得它们对于理解生态物种形成的早期步骤所涉及的过程特别感兴趣。这项研究是建立在15年的工作在这个系统中，将使我们能够1）提高我们的理解温度的作用，在资源多态性的进化外温动物，2）测试表型环境之间的功能关系，在两个离散的生态类型，和3）确定的机制，在鱼类的适应性性状的传输。除了对自然种群进行研究外，拟议的研究项目在概念上具有独创性，将共同有助于更好地了解动物适应性辐射的机制。此外，拟议的研究将允许培养两名硕士和两名博士。候选人和10名研究助理。这些学生将获得坚实的概念和实践技能，这是由雇主如公共组织，私营企业和学术机构的高度追求。