Dissertation Research: Terrestrial subsidies to aquatic food webs: new insights from hydrogen isotopes

食物网既可以由生态系统内产生的有机物支持，也可以由其他地方产生的有机物支持。例如，在许多湖泊中，陆源碎屑的输入对可利用的有机质有很大贡献。最近的研究量化了这些陆地补贴纳入食物网的程度。然而，这些研究仅限于极少数湖泊，因此难以理解补贴重要性的程度或驱动因素或变化。本研究旨在克服这些限制，通过测试一种新兴的新方法来量化陆地补贴水生消费者，并将这种方法应用于一套湖泊。研究人员将结合联合收割机实验室实验，实地实验，并比较实地调查，以完善氢稳定同位素的方法，并提供新的见解到跨生态系统subsidiars.As生态系统管理包括景观尺度，跨生态系统流量的测量承担更大的重要性，在环境评估。该项目将提供跨生态系统流量的新测量方法，同时开发一种强有力的新方法来测量陆地-水生补贴。

Food webs can be supported both by organic matter produced within an ecosystem and by organic matter produced elsewhere. In many lakes, for instance, inputs of terrestrial detritus substantially contribute to available organic matter. Recent research has quantified the extent to which these terrestrial subsidies are incorporated into the food web. However, these studies have been limited to very few lakes, making it difficult to understand the magnitude or drivers or variation in the importance of subsidies. This study seeks to overcome these limitations by testing an emerging new approach for quantifying terrestrial subsidies to aquatic consumers, and applying this approach across a suite of lakes. The investigators will combine laboratory experiments, field experiments, and comparative field surveys in order to refine the hydrogen stable isotope approach and provide new insights into cross-ecosystem subsidies.As ecosystem management embraces landscape scales, measurements of cross-ecosystem flows assume greater importance in environmental assessments. This project will provide new measurements of cross-ecosystem flows while developing a powerful new method for measuring terrestrial-aquatic subsidies.