Algal Nutrient Limitation and Food Quality for Aquatic Herbivores

水生草食动物的藻类营养限制和食物质量

• 批准号: 9019722
• 负责人: Robert Sterner
• 金额: $ 21.44万
• 依托单位: University of Texas at Arlington
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-01-15 至 1994-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9019722&HistoricalAwards=false
• 关键词: Algal; Nutrient; Limitation; Food; Quality

Nutrient limitation of algal growth provokes changes in the biochemical composition of the cells. This in turn affects the quality of algae as food for upper trophic levels. Models of the dynamics of the interaction of herbivores and their food thus should include such food quality effects. This research will explore the ways in which algal growth rate changes food quality. Laboratory demography studies of the freshwater cladoceran, Daphnia pulex, feeding on variously limited unialgal and multi- algal foods will be undertaken. These studies will ascertain the relationship between growth rate and quality in simple systems. In addition, food quality effects in natural populations will be examined through a set of experiments and measurements including 1. assessment of nature and degree of nutrient limitation in algal populations, 2. assessment of degree of food limitation in zooplankton populations, 3. measurement of assimilation efficiency of N and P in zooplankton. These data will then be used to explore in theoretical models how the stability and tendency for coexistence of herbivore and algae is influenced by food quality effects. Results will contribute to the conceptual basis of limnology and will add to the information base for managing aquatic resources.

藻类生长的营养限制引起了 细胞的生化组成。 这反过来又影响了 藻类作为高营养级食物的质量。 模型 食草动物和食物之间的相互作用 应该包括这种食品质量的影响。 这项研究将 探索藻类生长速度改变食物质量的方式。 淡水枝藻的实验室人口学研究， 蚤状水蚤，以各种有限的单藻和多藻为食， 藻类食品将被采用。 这些研究将确定 简单系统中的增长率和质量之间的关系。 此外，自然种群的食物质量影响将是 通过一系列实验和测量进行检查，包括 1.营养限制的性质和程度的评估 藻类种群，2.食物限制程度评估 浮游动物种群，3.同化测量 浮游动物氮磷效率。 这些数据将被 用于探索理论模型的稳定性和 草食动物和藻类共存的趋势受到 食品质量影响。 结果将有助于概念 湖沼学的基础，并将添加到信息库， 管理水产资源。