Quantitation of the Concentration of Detritus Associated with Marine Planktonic Communities

与海洋浮游生物群落相关的碎屑浓度的定量

• 批准号: 9521086
• 负责人: Peter Verity
• 金额: $ 27.97万
• 依托单位: Skidaway Institute of Oceanography
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-01-01 至 2000-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9521086&HistoricalAwards=false
• 关键词: Quantitation; Concentration; Detritus; Associated; Marine

9521086 Verity Non-living particulate organic matter, called detritus, plays an important role in the cycling of carbon and macronutrients in water column environments, especially in the ocean. Assessments of carbon bound in detrital particles typically exceed estimates of carbon from plankton and are second only to dissolved organic carbon. Detritus is a highly dynamic medium which provides a substrate for microbial respiration of dissolved organic carbon and its transformation into particular organic carbon and a substrate for abiotic condensation of exopolymers, secreted from bacteria and phytoplankton. However, the ability to quantify detritus in situ has remained an unresolved problem. The proposed research will investigate variability in particulate detrital carbon (and nitrogen):volume ratios using controlled laboratory experiments. Quantification will be conducted using a newly developed fluorescent labeling technique followed by imaging cytometry. Laboratory-derived data will be compared to field data from natural plankton communities in continental shelf waters. This work will allow accurate determinations of particulate detrital and plankton stock sizes, a necessary prerequisite to resolving the dynamic interchange of organic carbon and nitrogen between non-living and living resources, especially the downward flux and trophic transfer of such materials. ***

9521086 Verity 非生命颗粒有机物（称为碎屑）在水体环境（尤其是海洋）中的碳和大量营养素的循环中发挥着重要作用。 对碎屑颗粒中结合碳的评估通常超过对浮游生物碳的估计，仅次于溶解有机碳。 碎屑是一种高度动态的介质，它为溶解的有机碳的微生物呼吸及其转化为特定的有机碳提供底物，并为细菌和浮游植物分泌的外聚合物的非生物缩合提供底物。 然而，现场量化碎屑的能力仍然是一个未解决的问题。 拟议的研究将利用受控实验室实验来研究颗粒碎屑碳（和氮）的变化：体积比。 将使用新开发的荧光标记技术进行定量，然后进行成像细胞计数。 实验室获得的数据将与大陆架水域天然浮游生物群落的实地数据进行比较。 这项工作将能够准确测定颗粒碎屑和浮游生物种群的大小，这是解决非生物资源和生物资源之间有机碳和氮动态交换的必要先决条件，特别是此类材料的向下通量和营养转移。 ***