The Role of Sarcodine-Algal Symbiotic Associations in Upper Ocean Carbon and Nitrogen Cycles

肉碱-藻类共生关联在上层海洋碳和氮循环中的作用

• 批准号: 9017173
• 负责人: Anthony Michaels
• 金额: $ 14.03万
• 依托单位: Bermuda Institute of Ocean Sciences (BIOS), Inc.
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-08-01 至 1993-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9017173&HistoricalAwards=false
• 关键词: Role; Sarcodine; Algal; Symbiotic; Associations

The three classes of symbiont-bearing sarcodines (acantharia, polycystine radiolaria and foraminifera) are a conspicuous component of upper ocean communities. Most of the previous research on the ecology of these taxa has been concentrated on a single species or limited group of species. Dr. Michaels and colleagues will simultaneously examine the ecological role of the entire assemblage of these three protozoa. Their research examines two hypotheses: 1. In nutrient-poor oceanic environments, the symbiont primary production in the entire population of acantharia, polycystine radiolaria and foraminifera will represent a significant fraction of the total primary production and will dominate the production by large cells (operationally defined as cells larger than 74um). 2. Sarcodines will be a disproportionately important component of sinking material from the euphotic zone compared with their suspended biomass. Symbiont production rates of the entire population of symbiont-bearing sarcodines are determined through a combination of large volume and diver-collected production measurements to evaluate the importance of this production relative to total primary production. The significance of these planktonic protests for the vertical flux of material is estimated by the concurrent measurement of both the stocks of sarcodines and the rate of sinking export. These measurements are coordinated with the GOFS Time-Series Study at Bermuda (participation in two cruises per year), which enables the investigators to view their results from a large, seasonal perspective.

共生的三种鱼类（棘虫、多胱氨酸放射虫和有孔虫）是海洋上层群落的重要组成部分。以往对这些分类群的生态学研究大多集中在单个物种或有限的物种群上。迈克尔斯博士和他的同事们将同时研究这三种原生动物整体组合的生态作用。他们的研究检验了两个假设：1。在营养贫乏的海洋环境中，棘虫、多胱氨酸放射虫和有孔虫整个种群的共生初级产量将占初级总产量的很大一部分，并将主导大细胞（操作上定义为大于74um的细胞）的生产。2. 沙丁鱼将是一个不成比例的重要组成部分下沉的物质从透光区相比，他们的悬浮生物量。整个共生的沙丁鱼种群的共生产量是通过大量和潜水采集的产量测量相结合来确定的，以评估这种产量相对于总初级产量的重要性。这些浮游生物抗议对物质垂直通量的重要性是通过同时测量沙丁鱼种群和下沉出口速率来估计的。这些测量与在百慕大进行的GOFS时间序列研究（每年参加两次巡航）相协调，这使研究人员能够从一个大的、季节性的角度来看他们的结果。