Trophic Cascades and Interacting Control Processes in a Detritus-Based Aquatic Ecosystem

基于碎屑的水生生态系统中的营养级联和相互作用的控制过程

基本信息

批准号：
0213767
负责人：
Linda Deegan
金额：
$ 270万
依托单位：
Marine Biological Laboratory
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2002
资助国家：
美国
起止时间：
2002-10-01 至 2008-09-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=0213767&HistoricalAwards=false
关键词：
Trophic Cascades Interacting Control Processes

项目摘要

Human activity is changing local and global environments at unprecedented rates. Some of the most significant changes involve widespread nutrient enrichment and changes in species composition as well as global warming and sea level rise. Predicting the effects of these multiple stresses is particularly important in coastal salt marshes because they are among the most biologically productive areas in the world and are heavily used by humans for a variety of purposes. Coastal areas are now experiencing changes in nutrient loading, species composition and sea level rise 5-10 fold higher than measured over the last century. This project addresses the question: Over the long run, how will an increase in nutrients interact with changes in species composition to alter coastal ecosystem structure and function? We will conduct field experiments in which salt marsh ecosystems are altered by addition of nutrients and by removal of an abundant and important fish, the mummichog. We will follow the effects of these manipulations on the food web and nutrient cycles for four years. The experiments will be linked to a model that can be used to predict the saltmarsh response over decades. The results of this research will be useful to managers who are faced daily with resolving the conflicts among the many ways that humans use coastal regions.

人类活动以前所未有的速度改变了本地和全球环境。一些最重要的变化涉及广泛的营养富集以及物种组成的变化以及全球变暖和海平面上升。在沿海盐沼中预测这些多种压力的影响尤其重要，因为它们是世界上生物生产最高的地区之一，并且被人类大量用于各种目的。现在，沿海地区正在经历养分负荷，物种组成和海平面上升的变化，比上个世纪所测量的高5-10倍。该项目解决了一个问题：从长远来看，养分的增加将如何与物种组成的变化相互作用以改变沿海生态系统的结构和功能？我们将进行现场实验，其中通过添加养分和去除丰富而重要的鱼类木乃伊，从而改变了盐沼泽生态系统。我们将遵循这些操纵对食物网和营养周期的影响四年。实验将与一个模型相关，该模型可用于预测数十年来的盐晶反应。这项研究的结果将对每天面对的经理人在人类使用沿海地区的许多方式中解决冲突的经理有用。