Variable Effects of Nutrients, Productivity, Consumption and the Food Pulse on Floodplain River Ecosystems

科克·O·温尼米勒研究所：德克萨斯A&A；M大学建议编号：Deb-0089834这项研究探讨了涉及泛滥平原河流生态系统中低层食物网主要组成部分之间反馈和相互作用的机制的重要性和强度。这项工作将探索季节性洪水脉冲造成的时间异质性如何影响这些食物网。洪水导致营养脉冲进入水生生态系统，这种脉冲随着时间和空间的变化而变化。这些洪流可能会在消费者资源交互的互惠过程中造成时间滞后，从而使捐赠者控制不会持续主导系统。将利用一系列鱼类围栏/围栏实验来探索鱼类在年度水循环中对ALGE和颗粒有机物的影响。实验将在水循环的三个阶段进行。这项研究将在南美热带河流泛滥平原完成。这项工作将对加强科学理解捐赠者和消费者控制在生态系统动态方面的相对影响具有重要意义，并将有助于阐明生态系统如何将物种与景观联系起来。

ABSTRACTP.I. Kirk O. WinemillerInstitution: Texas A & M UniversityProposal Number: DEB-0089834This research addresses the importance and strength of mechanisms involved in feedbacks and interactions among major components of lower food webs in floodplain river ecosystems. The work will explore how temporal heterogeneity due to seasonal flood pulses influences these food webs. Floods lead to a nutrient pulse into aquatic ecosystems that varies over time and over space. These floods may cause time lags in the reciprocity of consumer resource interactions, so that donor-control does not dominate the system continuously. A series of fish exclosure/enclosure experiments will be used to explore fish effects on alge and particulate organic matter over the annual hydrocycle. Experiments will be conducted during three phases of the hydrocycle. The research will be completed in South American tropical riverine floodplains. The work will be significant in enhancing scientific understanding of the relative effects of donor vs. consumer control in relation to ecosystem dynamics and it will help elucidate how ecosystems link species to landscapes.