Feedback mechanisms between ecosystem change, fish behaviour and metabolism

生态系统变化、鱼类行为和新陈代谢之间的反馈机制

• 批准号: RGPIN-2016-04016
• 负责人: Rennie, Michael
• 金额: $ 2.04万
• 依托单位: Lakehead University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2019
• 资助国家: 加拿大
• 起止时间: 2019-01-01 至 2020-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=682375
• 关键词: Feedback; mechanisms; between; ecosystem; change

The ecosystem services that people draw from freshwater lakes in Canadarecreation, fishing and irrigation, to name a fewcan also cause stress on the aquatic communities that we draw those services from. These impacts may interact with each other, or with other forms of background stress (e.g., climate change) in unexpected ways. Accurately measuring how freshwater ecosystems respond to stress, and clearly understanding the ways in which specific stress factors act on ecosystems (and how stressors interact with one another) are key steps towards the long-term sustainable management of these vital ecosystems. A better understanding of how environmental stress impacts ecosystems, and the amount and types of stress aquatic ecosystems can tolerate, will put policy makers and resource managers in a better position to protect our essential freshwater resources while ensuring that they continue to provide the services we enjoy in a rapidly changing environment. ****The link between community structure and ecosystem function, or how quickly and what path energy takes as it moves through the food webs, remains an understudied area of ecological research. It is however becoming clear that in many cases, the behaviour of aquatic animals may help to explain some of the variability we observe in how efficiently energy is transferred from one trophic level of the food web to the next. ***Our research program seeks to reveal how structural changes in aquatic animal communities affect ecosystem function and energetic pathways. Our ultimate goal is to advance knowledge in the fields of fisheries biology, food web ecology, community ecology and bioenergetics, and to use the information we gain to help improve sustainable resource management of our freshwaters for future generations.***During the next five years of my NSERC Discovery Grant Program, I will lead my research group to more clearly illustrate the contribution of fish behaviour and metabolism to variation in energy transfer rates in Canadian freshwater lakes. We will address this objective using two complementary approaches. First, we will develop ecological models to take advantage of extensive long-term data and archived tissue collections of freshwater organisms from the world-class IISD-Experimental Lakes Area; this will allow us to model fish behaviour and metabolism over the course of decades through both whole ecosystem experiments and climate change, and will allow us to evaluate how important those changes are and how they may interact to alter fish behaviour and energy flow through these ecosystems. Second, we will develop and carry out a series of experimental and comparative lab and field-based ecological studies to evaluate and identify how fish behaviour differs among lakes that vary or change in specific ways, and relate those changes to vital rates of fish growth, density, reproduction and mortality.**

人们从Canadarecreation，钓鱼和灌溉中从淡水湖中汲取的生态系统服务，列举了几个人，还会引起我们从中汲取这些服务的水生社区的压力。这些影响可能会以意想不到的方式相互相互作用，或者与其他形式的背景压力（例如气候变化）相互作用。准确地衡量淡水生态系统如何应对压力，并清楚地了解特定压力因素对生态系统作用（以及压力彼此相互作用）的方式是迈向对这些重要生态系统的长期可持续管理的关键步骤。更好地了解环境压力如何影响生态系统，以及压力的水生生态系统的数量和类型将使政策制定者和资源经理处于更好的位置，以保护我们的基本淡水资源，同时确保他们继续提供我们喜欢的服务在一个快速变化的环境中。 ****社区结构与生态系统功能之间的联系，或能量在食物网中移动时所采取的速度和途径是生态学研究的一个研究领域。但是，很明显，在许多情况下，水生动物的行为可能有助于解释我们观察到的一些可变性，从而有效地从一个营养水平的食物网络传递到了下一个。 ***我们的研究计划旨在揭示水生动物社区的结构变化如何影响生态系统功能和能量途径。我们的最终目标是促进在渔业生物学，食品网络生态学，社区生态学和生物能学领域的知识，并利用我们获得的信息来帮助改善未来后代的新鲜水资源的可持续资源管理。在我的NSERC Discovery Grant计划中，我将领导我的研究小组更清楚地说明鱼类行为和代谢对加拿大淡水湖泊能量转移率变化的贡献。我们将使用两种互补方法来解决这个目标。首先，我们将开发生态模型，以利用来自世界一流的IISD实验湖泊地区的大量长期数据和存档的淡水生物组织收集；这将使我们能够通过整个生态系统实验和气候变化在数十年中对鱼类的行为和代谢进行建模，并使我们能够评估这些变化的重要性以及它们如何相互作用以改变鱼类的行为和能量流过这些生态系统。其次，我们将开发并进行一系列实验性和比较实验室和基于田间的生态学研究，以评估和确定鱼类行为在特定方式变化或变化的湖泊之间如何不同，并将这些变化与鱼类生长的重要率有关，密度，繁殖和死亡率。**