Collaborative Research: Impacts of a Strong Interactor Along a Productivity Gradient: Linking Watersheds with Reservoir Food Webs

9726927索兰诺和布雷米根在这项由多名调查员合作的提案中，PIS提出了一个雄心勃勃的项目，将利用参与者的不同优势对水生食物网进行多方面的调查。具体地说，他们将研究壁虎如何影响水库的营养结构和群落组织，并将其与流域过程联系起来。他们研究了核心问题，即沙子对不同生物群的影响是否取决于湖泊的生产力。龟背鱼是一种杂食性鱼类，在温水湖泊和水库的食物网中占据主导地位，随着生产力的提高变得更加重要。这项研究将量化导致肌体遮荫优势的流域特征，并研究肌体遮荫的影响如何在生产力梯度上发生变化。这项研究将测试与导致高富营养化系统中胆汁遮荫优势的因素以及胆汁遮荫影响如何随生产力变化有关的假设。具体地说，这项研究将研究俄亥俄州12个水库的营养负荷、生产力和胆汁遮荫丰度之间的关系及其影响，范围从中营养化到高度富营养化。这些比较实地研究将与旨在将这些模式与广泛适用的水生食物网和生态系统过程理论相联系的建模工作结合在一起。

9726927Soranno and BremiganIn this multi-investigator collaborative proposal the PIs propose an ambitious project that will utilize the diverse strengths of the participants in a multi-faceted investigation of an aquatic food web. Specifically, they will study how gizzard shad influence the trophic structure and community organization in reservoirs and tie this to watershed processes. They examine the central question of whether or not the influence of shad on different groups of organisms is dependent upon lake productivity. Gizzard shade is an omnivorous fish that dominates warm-water lake and reservoir food webs and becomes more important as productivity increases. This research will quantify the watershed features that lead to gizzard shade dominance and investigate how impacts of gizzard shade vary across the productivity gradient. The study will test hypotheses related to the factors causing gizzard shade dominance in hypereutrophic systems and how gizzard shade impacts vary with productivity. Specifically, this research will examine the relationships between nutrient loading, productivity and gizzard shade abundance and effects in 12 Ohio reservoirs, ranging from mesotrophic to hypereutrophic. These comparative field studies will be coupled with a modeling effort aimed at relating these patterns to a broadly applicable theory of aquatic food webs and ecosystem processes.