EAPSI: Understanding the response of a natural system to long-term acidification using Sydney rock oysters and mud crabs as a model predator-prey system

EAPSI：使用悉尼岩牡蛎和青蟹作为捕食者-被捕食系统模型来了解自然系统对长期酸化的反应

• 批准号: 1414746
• 负责人: Cassandra Glaspie
• 金额: $ 0.51万
• 依托单位: Glaspie Cassandra N
• 依托单位国家: 美国
• 项目类别: Fellowship Award
• 财政年份: 2014
• 资助国家: 美国
• 起止时间: 2014-06-01 至 2015-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1414746&HistoricalAwards=false
• 关键词: EAPSI; Understanding; response; natural; system

Ocean acidification is the gradual decrease in ocean pH as a result of carbon dioxide (CO2) uptake, and it is expected to have detrimental effects on the shell formation of calcified organisms such as oysters. The effect of ocean acidification on multiple interacting species should be explored to understand impacts on ecosystem dynamics. Mangrove estuaries experiencing acidic soil runoff near Sydney, Australia provide a natural laboratory for the study of ocean acidification and its effects on the ecosystem. This study will examine the effect of ocean acidification on a crab-oyster predator-prey system through a caging experiment and a laboratory experiment using a natural population of oysters that have been exposed to acidification for generations. This research will be conducted in collaboration with Dr. Melanie Bishop, an expert on community ecology of mangrove invertebrates, at Macquarie University in Sydney, Australia. In the source estuaries, Sydney rock oysters (Saccostrea glomerata) grown in either acidified or normal pH conditions will be enclosed in cages with mud crab predators (Scylla serrata) in both acidified and normal pH water for one week. The relationship between oyster mortality, the presence of mud crabs, and pH will be examined using linear models. In a separate laboratory experiment, oysters from acidified and normal pH sites will be exposed to mud crab predation, and video of predator behavior will be used to calculate handling time (the time a predator spends manipulating or eating a prey item). The effect of acidification on handling time and oyster mortality will be examined using ANOVAs. This study expands upon ocean acidification research by examining the effect of global change on interactions between two commercially important species, and by using oysters that have had generations to adapt to long-term acidification in nature. This NSF EAPSI award is funded in collaboration with the Australian Academy of Science.

海洋酸化是指由于吸收二氧化碳 (CO2) 而导致海洋 pH 值逐渐下降，预计会对牡蛎等钙化生物的壳形成产生不利影响。应探索海洋酸化对多种相互作用物种的影响，以了解对生态系统动态的影响。澳大利亚悉尼附近经历酸性土壤径流的红树林河口为研究海洋酸化及其对生态系统的影响提供了一个天然实验室。这项研究将通过笼养实验和使用世代暴露于酸化的自然牡蛎种群的实验室实验来研究海洋酸化对蟹牡蛎捕食者-猎物系统的影响。这项研究将与澳大利亚悉尼麦考瑞大学红树林无脊椎动物群落生态学专家 Melanie Bishop 博士合作进行。在源头河口，在酸化或正常 pH 值条件下生长的悉尼岩牡蛎 (Saccostrea glomerata) 将与青蟹捕食者 (Scylla serrata) 一起关在酸化和正常 pH 值水中的网箱中一周。将使用线性模型检查牡蛎死亡率、泥蟹的存在和 pH 值之间的关系。在一项单独的实验室实验中，来自酸化和正常 pH 值地点的牡蛎将暴露于泥蟹捕食之下，捕食者行为的视频将用于计算处理时间（捕食者花在操纵或吃掉猎物上的时间）。将使用方差分析检查酸化对处理时间和牡蛎死亡率的影响。这项研究扩展了海洋酸化研究，研究了全球变化对两个具有重要商业价值的物种之间相互作用的影响，并使用了几代人适应自然界长期酸化的牡蛎。该 NSF EAPSI 奖项是与澳大利亚科学院合作资助的。