Nutrient Effects on a Detritus-based Stream Ecosystem

养分对基于碎屑的河流生态系统的影响

• 批准号: 9806610
• 负责人: Amy Rosemond
• 金额: $ 70万
• 依托单位: University of Georgia Research Foundation Inc
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-01-01 至 2002-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9806610&HistoricalAwards=false
• 关键词: Nutrient; Effects; Detritus; based; Stream

Abstract98-06610RosemondNutrient effects on a detritus-based stream ecosystemIncreased nutrient concentrations threaten aquatic ecosystems worldwide. Nutrients, primarily nitrogen and phosphorus, from human and animal sewage and fertilizer runoff from farmland, are found in high concentrations in many lakes and streams. The amount of algae in the water body typically increases greatly in response to increased nutrient supply and dramatically alters the rest of the food web. However, the energy source of many aquatic food webs is dead plants (detritus) with associated bacteria and fungi, not algae. This study will determine the effects of increased nutrient supply on a detrital-based food web in a forested stream. The investigators will test whether nutrient addition increases microbial production and subsequently increases growth of stream consumers. They will also test whether microbes deplete detritus at rates that result in less food for higher consumers, thereby destabilizing the food web. The results of this work will aid in predicting how other detrital-based ecosystems respond to and are altered by human modification of nutrient supply.

摘要98-06610罗斯蒙德养分对基于碎屑的河流生态系统的影响养分浓度的增加威胁着全世界的水生生态系统。许多湖泊和溪流中含有高浓度的营养物质，主要是来自人类和动物污水以及农田径流的肥料，其中主要是氮和磷。 水体中藻类的数量通常会随着营养供应的增加而大幅增加，并极大地改变食物网的其余部分。 然而，许多水生食物网的能量来源是带有相关细菌和真菌的死亡植物（碎屑），而不是藻类。 这项研究将确定增加养分供应对森林溪流中以碎屑为基础的食物网的影响。 研究人员将测试营养物质的添加是否会增加微生物的产量并随后增加溪流消费者的生长。 他们还将测试微生物消耗碎屑的速度是否会导致高级消费者的食物减少，从而破坏食物网的稳定。 这项工作的结果将有助于预测其他基于碎屑的生态系统如何响应人类对营养供应的改变以及如何改变。