Terrestrial inputs to aquatic ecosystems: effects on food webs and carbon cycling

陆地对水生生态系统的投入：对食物网和碳循环的影响

• 批准号: 402530-2011
• 负责人: Solomon, Christopher
• 金额: $ 2.04万
• 依托单位: McGill University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2014
• 资助国家: 加拿大
• 起止时间: 2014-01-01 至 2015-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=550952
• 关键词: Terrestrial; inputs; aquatic; ecosystems; effects

My research program seeks to understand how cross-habitat connections influence food webs and ecosystem carbon cycles in lakes. Lakes receive substantial inputs of terrestrial organic matter from their watersheds. These inputs are consumed by aquatic organisms, helping to fuel production of fishes and invertebrates, and driving many lakes to be net sources of carbon to the atmosphere. Ongoing environmental changes are expected to alter terrestrial inputs to lakes, but the implications of these changes for food webs, fish populations, and carbon cycling are unclear. Over the next five years I will focus on two primary objectives to address those unknowns. First, I will use a whole-lake experiment, cross-lake comparative studies, and food web models to determine whether and when terrestrial inputs serve to subsidize or subtract from production of fishes and other consumers in lake food webs. Second, I will develop an improved model of land-lake-atmosphere carbon cycling, and apply this model to understanding carbon fluxes in temperate and boreal lakes. Collectively, these studies will test key predictions of ecological subsidy theory, elucidate the resources that support fish populations in lakes, and refine our understanding of the role of lakes in regional carbon cycles in lake-rich landscapes such as Canada.

我的研究计划旨在了解跨涉及的连接如何影响湖泊中的食物网和生态系统碳周期。湖泊从流域获得大量陆地有机物的投入。这些投入被水生生物所消耗，有助于促进鱼类和无脊椎动物的生产，并驱动许多湖泊成为大气中的碳源。预计持续的环境变化会改变对湖泊的陆地投入，但是这些变化对食物网，鱼类种群和碳循环的影响尚不清楚。在接下来的五年中，我将重点介绍两个主要目标，以解决这些未知数。首先，我将使用全湖实验，跨湖比较研究和食品网络模型来确定陆地投入是否以及何时从湖泊食品网中的鱼类和其他消费者的生产中补贴或减去。其次，我将开发一个改进的陆地大气碳循环模型，并将此模型应用于理解温带和北方湖泊中的碳通量。总的来说，这些研究将测试对生态补贴理论的关键预测，阐明支持湖泊中鱼类种群的资源，并完善我们对湖泊在加拿大等湖泊富裕景观中区域碳周期中作用的理解。