Dissertation Research: The Effects of Elevated Temperature on Symbiotic Dinoflagellates: Possible Sites of Damage and Protection and Coral Bleaching

论文研究：升高温度对共生甲藻的影响：可能的损害和保护部位以及珊瑚白化

• 批准号: 9702032
• 负责人: William Fitt
• 金额: $ 0.84万
• 依托单位: University of Georgia Research Foundation Inc
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-06-15 至 1999-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9702032&HistoricalAwards=false
• 关键词: Dissertation; Research; Effects; Elevated; Temperature

Fitt 9702032 The majority of reef building corals throughout the tropics contain high densities of the symbiotic dinoflagellate Symbiodinium sp.commonly called zooxanthellae. These algae are vital to the health of the individual coral colony as well as major contributors to the overall primary productivity that allows these reefs to flourish in the oligotrophic waters in which they reside. Recent wide spread bleaching events, correlated to elevated water temperatures, have occurred world wide in which corals have lost their zooxanthellae at alarming rates. While it has been shown that these algae are adversely effected by elevated temperature, the precise mechanisms of the cellular events that lead to a loss in photosynthetic ability have yet to be established. Objectives of this proposal are: (1) to investigate if different types of zooxanthellae in vitro exhibit differential levels of damage or protection to specific polypeptides of photosystem II at the biochemical, translational, and post-transcriptional level, and (2) to determine if similar processes exist for dinoflagellates living in different hosts that reside within habitats with different levels of temperature variability. These mechanisms of damage and protection appear to play a major role in determining the ecological distribution, as well as the ultimate fate of algalinvertebrate assemblages during periods of environmentally relevant stress.

Fitt 9702032 热带地区的大多数造礁珊瑚都含有高密度的共生甲藻共生藻，通常称为虫黄藻。这些藻类对个体珊瑚群落的健康至关重要，也是整体初级生产力的主要贡献者，使这些珊瑚礁能够在它们所居住的贫营养沃茨中蓬勃发展。最近，与水温升高相关的广泛的漂白事件在世界范围内发生，其中珊瑚以惊人的速度失去了它们的虫黄藻。 虽然已经表明这些藻类受到温度升高的不利影响，但导致光合能力丧失的细胞事件的精确机制尚未建立。 本提案的目的是：（1）调查不同类型的虫黄藻在体外是否表现出不同水平的损害或保护特定的光系统II的多肽在生化，翻译和转录后水平，和（2）以确定是否存在类似的过程甲藻生活在不同的主机，居住在不同的栖息地内的温度变化。 这些机制的损害和保护似乎发挥了重要作用，在确定的生态分布，以及最终的命运藻类无脊椎动物组合在环境相关的压力期间。