A Test of the Dependence of Secondary Production on Unicellular Algae in Running Water Ecosystems

流水生态系统中二次生产对单细胞藻类依赖性的检验

• 批准号: 9318205
• 负责人: William Lewis
• 金额: $ 28万
• 依托单位: University of Colorado at Boulder
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-01-15 至 1996-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9318205&HistoricalAwards=false
• 关键词: Test; Dependence; Secondary; Production; Unicellular

9318205 Lewis Studies of salt marshes, seagrass communities, and flood plains have shown that the consumer food webs of aquatic ecosystems may be strongly dependent on production of unicellular algae, even when organic matter from vascular plants is abundant. These findings suggest that the relative importance of unicellular algae in supporting consumer biomass in running waters, which are often dominated by organic matter from vascular plants, may have been underestimated. The proposal outlines a plan for testing this concept over a broad gradient of physical conditions in two rivers of the Colorado Rockies. The study plan is based on the application of stable isotope mentodology, which has been shown by means of pilot studies on the proposed field sites to provide good discrimination between vascular plant carbon and algal-derived carbon. The working hypotheses is that the overall contribution of algal carbon to secondary production is high whenever physical conditions permit sufficient irradiance at the substrate to support algal growth. The drainage basins, and includes corollary measurements of secondary production so that relative contributions of algal carbon to consumer production can be quantified. The study will clarify the relative importance of algal carbon over a wide range of physical conditions in the presence of organic carbon derived from vascular plants.

9318205刘易斯对盐沼、海草群落和洪泛平原的研究表明，水生生态系统的消费者食物网可能强烈依赖于单细胞藻类的生产，即使来自维管植物的有机物质丰富。 这些研究结果表明，单细胞藻类在支持消费者生物量在运行的沃茨，这往往是占主导地位的有机物从维管植物，可能被低估了相对重要性。 该提案概述了一个计划，在科罗拉多落基山脉的两条河流的物理条件的广泛梯度测试这一概念。 该研究计划是基于稳定同位素mentodology的应用，这已被证明是通过对拟议的现场网站的试点研究，提供良好的区别维管植物碳和藻类衍生的碳。 工作的假设是，藻类碳的二次生产的整体贡献是高的物理条件允许足够的辐照度在基板上，以支持藻类的生长。 流域，并包括间接测量的次级生产，使相对贡献的藻类碳消费生产可以量化。 该研究将阐明在存在来自维管植物的有机碳的情况下，藻类碳在各种物理条件下的相对重要性。