Structure and productivity of streams in urbanized landscapes

城市化景观中溪流的结构和生产力

• 批准号: 42799-2006
• 负责人: Morin, Antoine
• 金额: $ 1.46万
• 依托单位: University of Ottawa
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2006
• 资助国家: 加拿大
• 起止时间: 2006-01-01 至 2007-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=335085
• 关键词: Structure; productivity; streams; urbanized; landscapes

Urbanization pressures are increasing across Canada and hydrological alterations combined with diffuse loading of nutrients and contaminants are now recognized as the principal threats to running waters. The proposed research will examine the relationship between land use and the structure and productivity of stream ecosystems in urban areas. This research has implications both in terms of advancements in stream ecology and for developing management strategies to mitigate impacts of human activities on freshwater systems. From a theoretical perspective, this research will further our current understanding of energy flow in stream food webs by 1) quantifying the impact of altered hydrological regimes on productivity of algae, invertebrates, and fish, and 2) quantifying the impact of fish predation on the size structure of stream assemblages. The research will lead to models that predict how abundance and productivity of stream organisms change when land is developed. Such models can then be used to evaluate the effectiveness of management scenarios to protect biota in stream environments based on drainage basin activities. Societal concerns regarding stream habitat usually focus only on vertebrate communities; this research should show the important link between fish and the organisms they consume and how this varies along natural and imposed environmental gradients.

加拿大各地的城市化压力正在增加，水文变化加上营养物和污染物的扩散负荷现在被认为是对流动沃茨的主要威胁。拟议的研究将审查土地利用与城市地区河流生态系统的结构和生产力之间的关系。这项研究在溪流生态学的进步和制定管理战略，以减轻人类活动对淡水系统的影响方面都有影响。从理论的角度来看，这项研究将进一步我们目前的理解流食物网中的能量流1）量化改变水文制度对藻类，无脊椎动物和鱼类的生产力的影响，和2）量化鱼类捕食对流组合的大小结构的影响。这项研究将导致模型，预测如何丰富和生产力的河流生物变化时，土地的开发。这样的模型，然后可以用来评估管理方案的有效性，以保护基于流域活动的河流环境中的生物群。关于溪流栖息地的社会关注通常只集中在脊椎动物群落;这项研究应该显示鱼类和它们所消费的生物之间的重要联系，以及这种联系如何沿着自然和强加的环境梯度而变化。