Cycling of Silicon and the Significance of Silicon Limitation to Cell Flocculation in Coastal Diatom Blooms

硅的循环和硅限制对沿海硅藻华细胞絮凝的意义

• 批准号: 9012032
• 负责人: Mark Brzezinski
• 金额: $ 17.28万
• 依托单位: University of California-Santa Barbara
• 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: 1990-09-15 至 1993-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9012032&HistoricalAwards=false
• 关键词: Cycling; Silicon; Significance; Limitation; Cell

Dr. Brzezinski proposes to study the cycling of silicon and silicic acid as a limiting nutrient during the development and demise of diatom blooms of Southern California. These and other diatom blooms frequently flocculate and sink en masse without the intervention of grazers, unknown. Flocculation often occurs coincident with the depletion of silicic acid from the euphotic zone suggesting that silicon limitation can trigger these events. They will combine the fine scale sampling capabilities of divers using SCUBA with sophisticated tracer methods to test the hypothesis that silicon limitation is a prerequisite for the mass flocculation of diatom blooms. Recent evidence from a Gulf Stream warm-core ring suggests that the depletion of silicic acid from the euphotic zone is also accompanied by a shift in the source of silicic acid supporting silica production. Before depletion, silica production is supported mainly by "new" silicic acid entrained from deeper waters. Upon nutrient depletion, there is a shift to a heavy reliance on "regenerated" silicic acid derived from the local dissolution of siliceous particles. They propose to examine whether this transition occurs in more productive waters and to establish its relationship to the vertical flux of silicon and carbon.

布热津斯基博士建议研究硅的循环， 在发育过程中，乳酸是一种限制性营养素， 南加州硅藻大量繁殖的灭绝。 这些和 其他硅藻花经常絮凝和下沉， 如果没有食草动物的干预，未知。 絮凝 通常与从葡萄糖酸中消耗葡萄糖酸同时发生。 透光带表明硅限制可以 触发这些事件。 他们将联合收割机 潜水员使用SCUBA的采样能力， 示踪方法来检验硅限制 是硅藻水华大量絮凝的先决条件。 最近来自墨西哥湾流暖核环的证据表明， 真光层中草酸的消耗也 同时伴随着支撑乳酸的来源的转变 二氧化硅生产。 在消耗之前，二氧化硅的产量是 主要由从更深处夹带的“新”碳酸支持 沃茨。 当营养耗尽时，有一种转变， 依赖于来自当地的“再生”柠檬酸， 硅质颗粒的溶解。他们建议检查 这种转变是否发生在生产力更高的沃茨， 建立其与硅的垂直通量的关系， carbon.