The Quantitative Significance of Saltmarsh Microheterotrophsin Mediating the Flow of Nitrogen and Detrital Carbon to Higher Trophic Levels
盐沼微异养蛋白介导氮和碎屑碳向更高营养水平流动的定量意义
基本信息
- 批准号:9314584
- 负责人:
- 金额:$ 29.13万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Continuing Grant
- 财政年份:1994
- 资助国家:美国
- 起止时间:1994-04-01 至 1998-09-30
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Newell 9314584 Stable isotope studies have shown that in many salt-marsh metazoans obtain a large fraction of their carbon from cordgrass, Spartina alterniflora. However, the ribbed mussel, Geukensia demissa, a dominant metazoan in eastern salt marshes, has only a limited capacity to digest plant detritus. Thus, these scientists hypothesize that bacteria and other protists are important food-web components in mediating the flow of cordgrass carbon, and nitrogen, to higher organisms. To address this hypothesis, scientists will first determine the concentration of microheterotrophs, phytoplankton, and cordgrass carbon near mussel populations over seasonal and geographical scales and then integrate this information in a model with measurements of the metabolic carbon and nitrogen demands, feeding activity, and assimilation efficiencies of G. demissa. Such a model will allow these scientists to determine if the microheterotrophs are sufficiently abundant to act as a major food source and to explore how metazoans exert top- down control on microheterotrophs in salt-marsh ecosystems. To examine how general this concept is among eastern estuaries, Newell and Stoecker will transplant mussels from a mid-Atlantic marsh to northern and southern marshes for stable isotope analyses. The purpose is to demonstrate fundamental differences in patterns of carbon cycling in spatially separate salt marshes. When completed, this project will provide a more comprehensive understanding of food-web interactions in the detritus-based, salt-marsh ecosystems. ***
稳定同位素研究表明,在许多盐沼后生动物中,大部分的碳来自于网草和互花米草。然而,肋贻贝(Geukensia desmissa)是东部盐沼中的一种优势后生动物,它消化植物碎屑的能力有限。因此,这些科学家假设细菌和其他原生生物是食物网中重要的组成部分,在调节脐草碳和氮向高等生物的流动中。为了解决这一假设,科学家们将首先确定在季节和地理尺度上贻贝种群附近的微异养生物、浮游植物和网草碳的浓度,然后将这些信息整合到一个模型中,测量代谢碳和氮的需求、摄食活动和G. desmissa的同化效率。这样的模型将使这些科学家能够确定微异养生物是否足够丰富,作为主要的食物来源,并探索后生动物如何在盐沼生态系统中对微异养生物进行自上而下的控制。为了检验这一概念在东部河口的普遍性,Newell和Stoecker将把大西洋中部沼泽的贻贝移植到北部和南部沼泽进行稳定同位素分析。目的是为了证明在空间上不同的盐沼中碳循环模式的根本差异。该项目完成后,将对以碎屑为基础的盐沼生态系统中食物网的相互作用提供更全面的了解。***
项目成果
期刊论文数量(0)
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科研奖励数量(0)
会议论文数量(0)
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Roger Newell其他文献
Roger Newell的其他文献
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{{ truncateString('Roger Newell', 18)}}的其他基金
Utilization of the Detritus Complex by the Oyster Crassos- trea Virginica
维吉尼亚牡蛎对碎屑复合物的利用
- 批准号:
8400264 - 财政年份:1984
- 资助金额:
$ 29.13万 - 项目类别:
Continuing Grant
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