ROA: Associated and Abiotically Released DOM: Significanceto Stream Detritivores

ROA：相关和非生物释放的 DOM：对食腐动物的重要性

• 批准号: 8818772
• 负责人: Daniel Lawson
• 金额: $ 16.84万
• 依托单位: Michigan State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1989
• 资助国家: 美国
• 起止时间: 1989-03-15 至 1991-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8818772&HistoricalAwards=false
• 关键词: ROA; Associated; Abiotically; Released; DOM

Allochthonous inputs of organic matter to woodland streams comprise the principal energy source for diverse groups of detritivores during all, or for various stages of their life cycle. However, this statement only refers to the ability to ingest detritus and it remains poorly understood what components of detritus are assimilated. Associated microbial biomass is known to only contribute 12-45% of the dietary needs of the detritivores examined. Since detritivores lack the enzymes to degrade major plant structural components, it is suggested that other components of detritus are exploited by detritivores. It is proposed that the major dietary requirements of detritivores are provided by dissolved organic matter (DOM) which is associated with and/or released from coarse particulate organic matter (CPOM). The major source of this DOM is derived from organics which are: 1) released from the matrix of ingested detritus; 2) released from extracellular microbial products; or 3) transformed by microorganisms associated with their alimentary tract. It is hypothesized that detritivores have evolved a variety of feeding and digestive strategies to maximize the utilization of these resources. These are 1) physico-chemical properties associated with their midgut to release and digest these compounds; and 2) metabolism by hindgut micro-organisms and assimilation of these metabolites by detritivores. Studies will include: 1) characterization of the temporal qualitative and quantitative nature of DOM which is associated with and/or abiotically released from CPOM; and 2) determining the relative assimilation and fate of these ingested compounds. The significance of these studies not only applies to the basic principles of detritivore nutrition and growth, but to an understanding of carbon sorption, retention and turnover in lotic systems.

有机物对林地溪流的外来输入 构成了不同群体的主要能源， 在所有的时间里，或者在他们生命的各个阶段， 周期 然而，这一声明仅指能够 摄入碎屑，仍然不清楚是什么成分 被同化了 相关的微生物生物量是 据了解，只有12-45%的饮食需求的贡献， 食腐动物检查。 由于食虫动物缺乏酶， 降解主要植物结构成分，建议， 碎屑的其他成分被食草动物利用。 它 提出食蟹动物的主要饮食要求 是由溶解有机物（DOM）提供的， 与粗颗粒有机物相关和/或从粗颗粒有机物释放 （CPOM）。 这个DOM的主要来源来自于 有机物：1）从摄入的基质中释放出来 碎屑; 2）从细胞外微生物产物释放;或 3)由与其营养物质相关的微生物转化 道。 据推测，食虫动物已经进化出一种 各种喂养和消化策略，以最大限度地提高 利用这些资源。 这些是1）物理化学的 与它们的中肠相关的释放和消化特性 这些化合物;和2）后肠微生物的代谢， 这些代谢物被食草动物同化。 研究将 包括：1）时间定性和 DOM的定量性质与和/或 从CPOM非生物释放;和2）确定相对 这些摄入的化合物的同化和命运。 的 这些研究的意义不仅适用于基本的 的营养和生长的原则，但对一个 了解碳的吸附，保留和周转在lotic 系统.