Responses of calcifying macroalgae to ocean acidification

钙化大型藻类对海洋酸化的反应

• 批准号: NE/H025677/1
• 负责人: Rupert Perkins
• 金额: $ 9.82万
• 依托单位: CARDIFF UNIVERSITY
• 依托单位国家: 英国
• 项目类别: Training Grant
• 财政年份: 2010
• 资助国家: 英国
• 起止时间: 2010 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=NE%2FH025677%2F1
• 关键词: Responses; calcifying; macroalgae; ocean; acidification

The rapid reduction in carbonate saturation and seawater pH caused by ocean acidification has potential consequences for all marine biota. This PhD project focuses on the responses of coralline red algae and their associated biofilms. These critically important calcifying macroalgae (CM) are key primary producers, dominate hard surfaces from polar to tropical coral reefs to > 200 m deep, and are ecosystem engineers providing a substratum for many invertebrates. They produce a skeleton of high-Mg calcite which makes them particularly sensitive to the current changes in ocean chemistry. The effect of the associated biofilm on the growth of coralline algae and its response to ocean acidification is unknown. The aim of this project is to quantify the response of CMs to ocean acidification by asking the following questions: Does CM material not impacted by anthropogenic emissions exhibit a different skeletal morphology to fresh material? 2. Will CM growth rate vary along a latitudinal gradient due to different levels of photo-oxidative stress? 3. Will ocean acidification exacerbate the level of photo-oxidative stress in CMs by down regulated/inhibited productivity? 4. Will the balance between macroalgae and their predominantly non-calcifying biofilms shift as a result of OA? The project brings together Dr Perkins (Cardiff University), Dr Yallop (Bristol University) and Prof. Brodie (NHM, CASE partner), a consortium with expertise in micro- and macroalgal photophysiology, molecular biology and the global distribution of macroalgae. There will also be collaboration with Dr Bartsch (AWI Bremerhaven; BIOACID project). With field sites spanning a latitudinal gradient in the northeast Atlantic, the PhD will combine laboratory and field studies including molecular techniques, examination of skeletal morphology, measurements of photosynthesis and fluorescence, and comparative growth patterns to address the questions posed.

海洋酸化导致碳酸盐饱和度和海水pH值迅速下降，对所有海洋生物群都有潜在影响。这个博士项目的重点是珊瑚红藻及其相关生物膜的反应。这些极其重要的钙化大型藻类（CM）是主要的初级生产者，主宰着从极地到热带珊瑚礁到200米深的硬表面，是生态系统工程师，为许多无脊椎动物提供了底层。它们产生高镁方解石骨架，这使得它们对海洋化学的当前变化特别敏感。相关生物膜对珊瑚藻生长的影响及其对海洋酸化的反应尚不清楚。该项目的目的是量化CM对海洋酸化的响应，提出以下问题：CM材料不受人为排放的影响，表现出不同的骨骼形态，新鲜的材料？2. CM的生长速率是否会因不同水平的光氧化胁迫而沿沿着梯度变化？3.海洋酸化是否会通过下调/抑制生产力来加剧CM的光氧化应激水平？4.大型藻类和它们主要的非钙化生物膜之间的平衡会因为OA而改变吗？该项目汇集了Perkins博士（卡迪夫大学），Yallop博士（布里斯托大学）和Brodie教授（NHM，CASE合作伙伴），这是一个在微型和大型藻类生理学，分子生物学和大型藻类全球分布方面具有专业知识的财团。还将与Bartsch博士（AWI Bremerhaven; BIOACID项目）合作。随着现场跨越大西洋东北部的纬度梯度，博士将结合联合收割机实验室和现场研究，包括分子技术，骨骼形态学检查，光合作用和荧光的测量，以及比较生长模式，以解决所提出的问题。