Illuminating Mechanisms of Resilience to Climate Change in Marine Ecosystems

阐明海洋生态系统抵御气候变化的机制

• 批准号: RGPIN-2018-06669
• 负责人: Baum, Julia
• 金额: $ 4.74万
• 依托单位: University of Victoria
• 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=745608
• 关键词: Illuminating; Mechanisms; Resilience; Climate; Change

Vibrant coral reefs are the world's most biologically diverse marine ecosystems. They are also the most vulnerable to climate change. Although climate change will significantly impact all ocean life in the coming decades, the future of coral reefs is under imminent threat from pulse heat-stress events like the increasingly frequent and severe El Nios. Heat stress of even 1C disrupts the vital association between the coral animal and its microscopic algal symbionts, causing the coral to bleach. Because these symbionts fuel coral growth, prolonged bleaching can cause the coral to starve to death. Heat stress from the 2015-2016 El Nio event triggered the worst global coral bleaching and mass mortality event on record. Christmas Island, the central equatorial Pacific atoll where my team and I have worked for the past decade, was ground zero. Heat stress on its reefs persisted for ten consecutive months, resulting in 90% coral mortality. This loss is devastating. We must learn from it. This event presents an exceptional opportunity to study: 1) how some corals managed to survive unprecedented heat stress; 2) how extensive coral loss impacts biodiversity, habitat complexity and reef fish communities; 3) recovery rates, and which factors are most vital to enhance recovery; and 4) how overall ecosystem resilience is changing. We will investigate these questions through intensive study of Christmas Island's coral reefs over the next five years and the synthesis of these new data with the wealth of coral, algae, fish, and environmental data we collected at our 40 monitoring sites around the atoll in expeditions before, during and immediately after the El Nio. We will evaluate the generality of insights from Christmas Island through analyses of coral monitoring data from across the Pacific Ocean, including regions with variable coral bleaching histories. Finally, we will synthesize evidence for climate change impacts and resilience mechanisms across marine ecosystems globally. Our work will provide critical insight into the question of whether protecting the ocean from local stressors, like fishing and pollution, enhances its resilience to climate change. It will advance biodiversity and resilience theory, and it will provide Canada with the knowledge and intellectual capacity to develop management solutions that can ensure our oceans are resilient for generations to come. This research program is built on innovative integrated use of underwater surveys and collections, novel 3D imagery and modeling techniques, molecular analyses, remote sensing, and cutting-edge bioinformatics and statistics. I will train a large team of undergraduate and graduate students, and postdoctoral fellows in these methods, and I will continue my strong history of providing them with indispensable skills for their careers in science, including critical-thinking, data management, writing, and science communication.

生机勃勃的珊瑚礁是世界上生物多样性最丰富的海洋生态系统。他们也最容易受到气候变化的影响。尽管气候变化将在未来几十年对所有海洋生物产生重大影响，但珊瑚礁的未来正面临日益频繁和严重的厄尔尼诺等脉冲热应激事件的迫在眉睫的威胁。即使是1摄氏度的热应激也会破坏珊瑚动物与其微观共生藻类之间的重要联系，导致珊瑚漂白。因为这些共生体促进了珊瑚的生长，长时间的白化会导致珊瑚饿死。2015-2016年厄尔尼诺事件造成的热应激引发了有史以来最严重的全球珊瑚白化和大规模死亡事件。圣诞岛是赤道太平洋中部的环礁，我和我的团队在这里工作了十年。珊瑚礁上的热应力持续了10个月，导致90%的珊瑚死亡。这一损失是毁灭性的。我们必须从中吸取教训。这一事件提供了一个特殊的机会来研究：1)一些珊瑚如何在前所未有的热压力下生存；2)广泛的珊瑚损失如何影响生物多样性、栖息地复杂性和珊瑚礁鱼类群落；3)采收率，哪些因素对提高采收率最重要；4)生态系统的整体恢复能力是如何变化的。我们将在未来五年内对圣诞岛的珊瑚礁进行深入研究，并将这些新数据与我们在厄尔尼诺之前、期间和之后的考察中在环礁周围的40个监测点收集的丰富的珊瑚、藻类、鱼类和环境数据相结合，来调查这些问题。我们将通过分析整个太平洋的珊瑚监测数据，包括具有不同珊瑚白化历史的地区，来评估圣诞岛的一般性见解。最后，我们将综合全球海洋生态系统气候变化影响和恢复机制的证据。我们的工作将为保护海洋免受当地压力因素（如捕鱼和污染）是否能增强其对气候变化的适应能力这一问题提供关键见解。它将推进生物多样性和复原力理论，并将为加拿大提供知识和智力能力，以制定管理解决方案，确保我们的海洋为子孙后代具有复原力。这项研究计划是建立在水下调查和收集、新颖的3D图像和建模技术、分子分析、遥感以及尖端生物信息学和统计学的创新综合使用之上的。我将用这些方法培养一个由本科生、研究生和博士后组成的大团队，我将继续我的强大历史，为他们提供他们在科学事业中不可或缺的技能，包括批判性思维、数据管理、写作和科学传播。