Collaborative Research: Rhizosolenia Mats as a Source of Nitrogen Flux into the Surface Waters of the Pacific Ocean: Fe Stress, N Excretion and Basin Scale Distribution Patterns
合作研究:根管藻垫作为太平洋表层水氮通量的来源:铁胁迫、氮排泄和盆地规模分布模式
基本信息
- 批准号:0094591
- 负责人:
- 金额:$ 49.24万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Continuing Grant
- 财政年份:2001
- 资助国家:美国
- 起止时间:2001-05-15 至 2005-04-30
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Collaborative research: Rhizosolenia mats as a source of nitrogen flux into the surface waters of the Pacific Ocean: Fe stress, N excretion and basin scale distribution patternsThis project will quantify nitrogen cycling dynamics in the euphotic zone by vertically migrating Rhizosolenia mats, and will provide the first physiological data on mats below diver accessible depths. These macroscopic diatom assemblages sink below the euphotic zone to acquire nitrate, store it in their vacuole, and then return to the surface for photosynthesis. This new production is based entirely on a biologically, rather than physically mediated transport of N. These fragile associations require specialized collection techniques such as SCUBA and remotely operated vehicles (ROVs). As a result, their biology and biogeochemical importance has been largely overlooked. Other taxa also vertically migrate, and this project will conduct the first enumeration of this entire community in order to understand the broader role of vertical migration in oceanic nitrogen cycling.In-situ video imaging techniques will be used to quantify mats in the eastern central N. Pacific gyre. Depth specific (MOCNESS) sampling will be used to quantify the remaining taxa. A ROV will be used to collect mats below diver accessible depths in order to compare deep mats with surface mats. An existing computer model will be used to calculate transport/flux rates with these revised estimates. In addition to transporting N, Rhizosolenia mats under Fe and/or light stress may excrete both inorganic and organic nitrogen. This will be evaluated using both laboratory and field Rhizosolenia. Based on previous results, oceanic Rhizosolenia mats in nature appear to be chronically Fe-stressed. However, ferredoxin, a common and convenient in situ marker of cellular Fe status, may not be produced in these oceanic taxa and thus may not be a valid means of characterizing Fe stress in open ocean Rhizosolenia. As part of our research, we will evaluate this indicator for Fe stress in Rhizosolenia isolated from the Pacific Ocean. Our goals are to assess the Fe quotas of rhizosolenid diatoms, document the validity of the ferredoxin index as a measure of Fe stress in large oceanic diatoms, and determine N excretion rates by these taxa. A migration model will be rigorously tested by examining deep mats. These data will provide additional insight into the synergistic relationship between trace nutrient limitation and macronutrient acquisition and assimilation, an important developing theme of modern biological oceanography. The rates of biological N import and release for the eastern half of the central N. Pacific gyre by the entire migrating community will be assessed. This is a fundamental to understanding oceanic N cycles, and has direct relevance for both carbon and nitrogen cycling in the upper ocean.
合作研究:根管藻垫作为进入太平洋表层水域的氮通量来源:铁胁迫、氮排泄和盆地规模分布模式该项目将通过垂直迁移根管藻垫来量化透光区的氮循环动态,并将提供潜水员可到达深度以下的垫子上的第一个生理数据。这些宏观硅藻组合下沉到透光带下方以获取硝酸盐,将其储存在液泡中,然后返回表面进行光合作用。这种新的生产完全基于生物而非物理介导的氮运输。这些脆弱的关联需要专门的收集技术,如水肺潜水和遥控潜水器 (ROV)。因此,它们的生物学和生物地球化学重要性在很大程度上被忽视了。其他类群也会垂直迁移,该项目将对整个群落进行首次计数,以了解垂直迁移在海洋氮循环中的更广泛作用。现场视频成像技术将用于量化东部中北部的垫层。太平洋环流。深度特定(MOCNESS)采样将用于量化剩余的分类单元。 ROV 将用于收集潜水员可触及深度以下的垫子,以便将深层垫子与表面垫子进行比较。现有的计算机模型将用于根据这些修订后的估计来计算传输/通量率。 除了运输氮之外,在铁和/或光胁迫下的根管藻垫还可以分泌无机和有机氮。 这将使用实验室和现场根管藻进行评估。根据之前的结果,自然界中的海洋根管藻垫似乎长期处于铁胁迫状态。 然而,铁氧还蛋白(一种常见且方便的细胞铁状态原位标记物)可能不会在这些海洋类群中产生,因此可能不是表征开放海洋根管藻中铁胁迫的有效手段。 作为我们研究的一部分,我们将评估从太平洋分离出来的根管藻中铁胁迫的这一指标。我们的目标是评估根管藻硅藻的铁配额,记录铁氧还蛋白指数作为大型海洋硅藻铁胁迫指标的有效性,并确定这些类群的氮排泄率。迁移模型将通过检查深层垫子进行严格测试。这些数据将为微量营养素限制与常量营养素获取和同化之间的协同关系提供更多见解,这是现代生物海洋学的一个重要发展主题。 将评估整个迁徙群落在北太平洋环流中部东半部的生物氮输入和释放率。这是理解海洋氮循环的基础,并且与上层海洋的碳和氮循环直接相关。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
数据更新时间:{{ journalArticles.updateTime }}
{{
item.title }}
{{ item.translation_title }}
- DOI:
{{ item.doi }} - 发表时间:
{{ item.publish_year }} - 期刊:
- 影响因子:{{ item.factor }}
- 作者:
{{ item.authors }} - 通讯作者:
{{ item.author }}
数据更新时间:{{ journalArticles.updateTime }}
{{ item.title }}
- 作者:
{{ item.author }}
数据更新时间:{{ monograph.updateTime }}
{{ item.title }}
- 作者:
{{ item.author }}
数据更新时间:{{ sciAawards.updateTime }}
{{ item.title }}
- 作者:
{{ item.author }}
数据更新时间:{{ conferencePapers.updateTime }}
{{ item.title }}
- 作者:
{{ item.author }}
数据更新时间:{{ patent.updateTime }}
Cynthia Pilskaln其他文献
Cynthia Pilskaln的其他文献
{{
item.title }}
{{ item.translation_title }}
- DOI:
{{ item.doi }} - 发表时间:
{{ item.publish_year }} - 期刊:
- 影响因子:{{ item.factor }}
- 作者:
{{ item.authors }} - 通讯作者:
{{ item.author }}
{{ truncateString('Cynthia Pilskaln', 18)}}的其他基金
Collaborative Research: Taking the Pulse of the Arctic Ocean - A US Contribution to the International Synoptic Arctic Survey
合作研究:把握北冰洋的脉搏——美国对国际北极天气调查的贡献
- 批准号:
2051642 - 财政年份:2021
- 资助金额:
$ 49.24万 - 项目类别:
Continuing Grant
POC Production and Export in the Indian Ocean Sector of the Southern Ocean: A US-China Collaborative Research Program
南大洋印度洋海域 POC 生产和出口:中美合作研究项目
- 批准号:
0196521 - 财政年份:2001
- 资助金额:
$ 49.24万 - 项目类别:
Continuing Grant
POC Production and Export in the Indian Ocean Sector of the Southern Ocean: A US-China Collaborative Research Program
南大洋印度洋海域 POC 生产和出口:中美合作研究项目
- 批准号:
9726186 - 财政年份:1998
- 资助金额:
$ 49.24万 - 项目类别:
Continuing Grant
A Planning visit to China: U.S.-China Collaborative Research in the Southern Ocean
计划访华:美中南大洋合作研究
- 批准号:
9723583 - 财政年份:1997
- 资助金额:
$ 49.24万 - 项目类别:
Standard Grant
Collaborative Research: Nitrate Flux Associated with Vertically Migrating Phytoplankton in the Central North Pacific Gyre
合作研究:与北太平洋中部环流垂直迁移浮游植物相关的硝酸盐通量
- 批准号:
9423471 - 财政年份:1995
- 资助金额:
$ 49.24万 - 项目类别:
Continuing Grant
Particle Transformations in the "Regeneration Zone": The Biology and Chemistry of Mesopelagic Aggregates
“再生区”中的粒子转变:中层聚集体的生物学和化学
- 批准号:
9496077 - 财政年份:1993
- 资助金额:
$ 49.24万 - 项目类别:
Continuing Grant
Particle Transformations in the "Regeneration Zone": The Biology and Chemistry of Mesopelagic Aggregates
“再生区”中的粒子转变:中层聚集体的生物学和化学
- 批准号:
9015602 - 财政年份:1991
- 资助金额:
$ 49.24万 - 项目类别:
Continuing Grant
Zooplankton Fecal Pellet Flux and Deposition in the Black Sea
黑海浮游动物粪便颗粒通量和沉积
- 批准号:
8996168 - 财政年份:1989
- 资助金额:
$ 49.24万 - 项目类别:
Standard Grant
Zooplankton Fecal Pellet Flux and Deposition in the Black Sea
黑海浮游动物粪便颗粒通量和沉积
- 批准号:
8614557 - 财政年份:1988
- 资助金额:
$ 49.24万 - 项目类别:
Standard Grant
相似国自然基金
IGF-1R调控HIF-1α促进Th17细胞分化在甲状腺眼病发病中的机制研究
- 批准号:82301258
- 批准年份:2023
- 资助金额:30 万元
- 项目类别:青年科学基金项目
CTCFL调控IL-10抑制CD4+CTL旁观者激活促口腔鳞状细胞癌新辅助免疫治疗抵抗机制研究
- 批准号:82373325
- 批准年份:2023
- 资助金额:49 万元
- 项目类别:面上项目
RNA剪接因子PRPF31突变导致人视网膜色素变性的机制研究
- 批准号:82301216
- 批准年份:2023
- 资助金额:30 万元
- 项目类别:青年科学基金项目
血管内皮细胞通过E2F1/NF-kB/IL-6轴调控巨噬细胞活化在眼眶静脉畸形中的作用及机制研究
- 批准号:82301257
- 批准年份:2023
- 资助金额:30 万元
- 项目类别:青年科学基金项目
基于多元原子间相互作用的铝合金基体团簇调控与强化机制研究
- 批准号:52371115
- 批准年份:2023
- 资助金额:50 万元
- 项目类别:面上项目
相似海外基金
Collaborative Research: Rhizosolenia Mats as a Source of Nitrogen Flux into the Surface Waters of the Pacific Ocean: Fe Stress, NE Excretion and Basin Scale Distribution Patterns
合作研究:根管藻垫作为太平洋表层水氮通量的来源:铁胁迫、NE 排泄和盆地规模分布模式
- 批准号:
0095404 - 财政年份:2001
- 资助金额:
$ 49.24万 - 项目类别:
Standard Grant
Collaborative Research: Rhizosolenia Mats as a Source of Nitrogen Flux into the Surface Waters of the Pacific Ocean: Fe stress, N excretion and basin-scale distribution patterns
合作研究:根管藻垫作为太平洋表层水氮通量的来源:铁胁迫、氮排泄和盆地规模分布模式
- 批准号:
0099015 - 财政年份:2001
- 资助金额:
$ 49.24万 - 项目类别:
Continuing Grant
Collaborative Research: Silica Cycling in the Central North Pacific Gyre: Role of Rhizosolenia Mats and Suspended Diatoms
合作研究:北太平洋中部环流中的二氧化硅循环:根管藻垫和悬浮硅藻的作用
- 批准号:
9896160 - 财政年份:1998
- 资助金额:
$ 49.24万 - 项目类别:
Continuing Grant
Collaborative Research: Silica Cycling in the Central North Pacific Gyre: Roles of Rhizosolenia Mats and Suspended Diatoms
合作研究:北太平洋中部环流中的二氧化硅循环:根管藻垫和悬浮硅藻的作用
- 批准号:
9401990 - 财政年份:1994
- 资助金额:
$ 49.24万 - 项目类别:
Continuing Grant
Collaborative Research: Silica Cycling in the Central North Pacific Gyre: Role of Rhizosolenia Mats and Suspended Diatoms
合作研究:北太平洋中部环流中的二氧化硅循环:根管藻垫和悬浮硅藻的作用
- 批准号:
9414372 - 财政年份:1994
- 资助金额:
$ 49.24万 - 项目类别:
Continuing Grant