Organismal responses of freshwater fish to elevated carbon dioxide

淡水鱼对二氧化碳升高的机体反应

• 批准号: RGPIN-2019-06125
• 负责人: Hasler, Caleb
• 金额: $ 2.04万
• 依托单位: University of Winnipeg
• 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=745736
• 关键词: Organismal; responses; freshwater; fish; elevated

Climate change, aquaculture, and aquatic invasive species management all expose freshwater fishes to elevated CO2 and it is therefore imperative to understand the consequences of high CO2 on fish. For example, recent data from the Laurentian Great Lakes and European reservoirs show that increasing CO2 in freshwater environments is pervasive; evidence from many aquaculture facilities suggest that high CO2 limits fish production; and, barriers made by injecting CO2 are being used to limit the distribution of aquatic invasive species. Largely unknown, however, is how freshwater fish respond to prolonged changes to environmental CO2. My long-term objective is to understand responses of freshwater fishes to elevated CO2 across biological and evolutionary scales. Over the next five years, I will address three short-term objectives: 1) determine organismal and molecular responses to elevated CO2 in freshwater fishes; 2) assess fish responses to elevated CO2 when faced with other abiotic and biotic challenges, such as parasitic load, nutritional status, and thermal stress; and 3) explore multigenerational responses in freshwater fishes to elevated CO2 (e.g., reproductive output, parental effects, and transgenerational acclimation). Completing studies under Objective 1 will allow me to determine the degree to which individuals experience negative consequences to high CO2 and will be applicable to understanding how high CO2 limits aquaculture production and the rate at which acute changes in CO2 might influence wild fishes. Objective 2 will build on the above objective by understanding the role that other challenges, specifically thermal stress, parasitic load, and nutritional status, have on fish responses to elevated CO2. Addressing Objective 3 will allow me to project into the future the phenotypic responses to high CO2 that will relate to population-level changes. My aim is to improve our understanding of environmental CO2 effects on freshwater fishes by monitoring responses across biological (e.g., metabolism to whole-animal) and evolutionary (e.g., reproductive output to multigenerational) scales. My research will support policy decisions and conservation practices related to climate change, aquaculture technology, and invasive species management. Therefore, my research program is relevant and can improve Canadian fish production at aquaculture facilities and inform conservation management of Canada's natural fish populations and aquatic environments. Ultimately, I will help predict how global freshwater fish populations may be altered by rising CO2 levels.

气候变化、水产养殖和水生入侵物种管理都使淡水鱼暴露于高浓度的CO2中，因此必须了解高CO2对鱼类的影响。例如，从劳伦特五大湖和欧洲水库获得的最新数据表明，淡水环境中二氧化碳的增加是普遍的;从许多水产养殖设施获得的证据表明，高二氧化碳限制了鱼类生产;注入二氧化碳形成的障碍被用来限制水生入侵物种的分布。然而，淡水鱼如何对环境CO2的长期变化做出反应，这一点几乎是未知的。 我的长期目标是了解淡水鱼在生物和进化尺度上对CO2升高的反应。在接下来的五年里，我将解决三个短期目标：1）确定淡水鱼对CO2升高的生物和分子反应; 2）评估鱼类在面临其他非生物和生物挑战时对CO2升高的反应，如寄生虫负荷，营养状况和热应激; 3）探索淡水鱼对CO2升高的多代反应（例如，繁殖输出、亲本效应和跨代适应）。完成目标1下的研究将使我能够确定个人经历高CO2的负面影响的程度，并将适用于了解高CO2如何限制水产养殖生产以及CO2急剧变化可能影响野生鱼类的速度。目标2将建立在上述目标的基础上，了解其他挑战，特别是热应激，寄生虫负荷和营养状况对鱼类对CO2升高的反应的作用。解决目标3将使我能够预测未来对高二氧化碳的表型反应，这将与人口水平的变化有关。我的目标是通过监测生物（例如，代谢到整个动物）和进化（例如，生殖产出到多代）规模。我的研究将支持与气候变化，水产养殖技术和入侵物种管理相关的政策决策和保护实践。因此，我的研究计划是相关的，可以提高加拿大水产养殖设施的鱼类产量，并告知加拿大的自然鱼类种群和水生环境的保护管理。最终，我将帮助预测全球淡水鱼种群可能会因二氧化碳水平上升而发生的变化。