RAPID collaborative proposal: Will corals recover from bleaching under ocean acidification conditions?

RAPID 合作提案：珊瑚会在海洋酸化条件下从白化中恢复吗？

• 批准号: 1514861
• 负责人: Robert Toonen
• 金额: $ 2.79万
• 依托单位: University of Hawaii
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-01-15 至 2016-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1514861&HistoricalAwards=false
• 关键词: RAPID; collaborative; proposal; Will; corals

Following the second hottest month on record since the 1940s, water temperatures near the main Hawaiian Islands reached 30 °C in October 2014. The result of this 2 °C increase above normal temperatures has been a severe bleaching event across the Hawaiian Archipelago. In Kaneohe Bay, 75% of the dominant coral species are bleached. Bleaching is a stress response whereby corals lose their symbiotic algae and turn white. Prolonged bleaching can lead to disease, decreases in coral growth and reproduction, and even death. In addition, rising atmospheric levels of carbon dioxide cause the oceans to become more acidic and potentially less hospitable to coral reefs. By the end of this century, seawater is predicted to be twice as acidic as it is today. The current bleaching event in Hawaii provides a rare opportunity to test the ability of corals to recover under the acidic ocean conditions expected by the end of this century. This research compares the recovery rate of bleached corals in normal seawater to those exposed to more acidic seawater. The results will inform which species or reef regions are more resilient to global change conditions and thus better targets for protection. The results will be particularly relevant to management of the Papahanaumokuakea Marine National Monument and World Heritage site. It will also provide critical data input for models that project the persistence of reefs in the future. Educationally, the research will provide a dynamic learning and training environment for students and a post-doctoral researcher. Minority students will be recruited and trained in marine science providing them with excellent career options in STEM disciplines. Results will be broadly disseminated through publications, classroom visits, public outreach and online media. Coral reefs are among the most diverse ecosystems on the planet, housing an estimated 25% of marine species. Massive coral bleaching poses a substantial threat to the integrity of coral reef habitats, and is predicted to be the major source of mortality for reefs under future climate model scenarios. Although previous work on the recovery of corals from bleaching sets the groundwork for this project, it remains to be seen how recovery from bleaching will be impacted by climate change and ocean acidification. This project takes advantage of the natural difference in baseline temperature and seawater acidity conditions between Kaneohe Bay and Waimanalo Bay, HI. Both these sites are impacted by the massive bleaching event. This research will test the recovery rate of bleached corals in normal seawater to that of bleached corals exposed to more acidic seawater. Three questions will be addressed: 1) Will ocean acidification slow rates of recovery from bleaching?; 2) Does zooplankton feeding minimize the impact of bleaching?; and 3) Do corals acclimated to warmer, more acidic conditions (Kaneohe Bay) recover more quickly than corals at present day mean oceanic conditions (Waimanalo Bay)? The project integrates techniques across the disciplines of ecology, physiology, evolution, and genomics. The research will help to identify characteristics of resilient coral species or populations that are more likely to survive bleaching events in the future.

继20世纪40年代以来有记录以来第二热的月份之后，夏威夷主要岛屿附近的水温在2014年10月达到30 °C。 比正常温度高出2 °C的结果是整个夏威夷群岛发生了严重的白化事件。在卡内奥赫湾，75%的主要珊瑚物种都被漂白。 漂白是一种压力反应，珊瑚失去了共生藻类，变成白色。长时间的漂白会导致疾病，减少珊瑚的生长和繁殖，甚至死亡。 此外，大气中二氧化碳水平的上升导致海洋变得更加酸性，可能不太适合珊瑚礁。 预计到本世纪末，海水的酸性将是现在的两倍。 目前发生在夏威夷的漂白事件提供了一个难得的机会，可以测试珊瑚在预计到本世纪末的酸性海洋条件下恢复的能力。 这项研究比较了漂白珊瑚在正常海水中的恢复率和暴露在酸性海水中的珊瑚的恢复率。研究结果将告知哪些物种或珊瑚礁区域对全球变化条件更具适应力，从而更好地保护目标。 其结果将特别与Papahanaumokuakea海洋国家纪念碑和世界遗产遗址的管理有关。 它还将为预测未来珊瑚礁持久性的模型提供关键数据输入。 在教育方面，这项研究将为学生和博士后研究人员提供一个动态的学习和培训环境。 少数民族学生将被招募并接受海洋科学培训，为他们提供STEM学科的优秀职业选择。将通过出版物、课堂访问、公共宣传和在线媒体广泛传播成果。珊瑚礁是地球上最多样化的生态系统之一，估计有25%的海洋物种。大规模的珊瑚白化对珊瑚礁生境的完整性构成了重大威胁，据预测，在未来的气候模式情景下，这将是珊瑚礁死亡的主要原因。虽然先前关于从漂白中恢复珊瑚的工作为该项目奠定了基础，但从漂白中恢复的工作将如何受到气候变化和海洋酸化的影响仍有待观察。该项目利用了夏威夷卡内奥赫湾和瓦伊马纳洛湾之间基线温度和海水酸度条件的自然差异。这两个地点都受到大规模漂白事件的影响。这项研究将测试漂白珊瑚在正常海水中的恢复率，以及漂白珊瑚暴露在酸性海水中的恢复率。会议将讨论三个问题：1）海洋酸化是否会减缓漂白后的恢复速度？2)浮游动物的摄食能使白化的影响最小化吗？和3）适应更温暖，更酸性的条件下（卡内奥赫湾）的珊瑚比珊瑚在目前的平均海洋条件下（瓦伊马纳洛湾）更快地恢复？该项目整合了生态学、生理学、进化和基因组学等学科的技术。这项研究将有助于确定未来更有可能在漂白事件中幸存下来的弹性珊瑚物种或种群的特征。