Omnivorous Fish and the Stability of Aquatic Food Webs

杂食性鱼类与水生食物网的稳定性

• 批准号: 9982124
• 负责人: Michael Vanni
• 金额: $ 27.5万
• 依托单位: Miami University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-05-01 至 2003-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9982124&HistoricalAwards=false
• 关键词: Omnivorous; Fish; Stability; Aquatic; Food

AWARD ABSTRACT Michael J. VanniMiami UniversityProposal Number: DEB-9982124The PI proposes to investigate the role of an omnivorous fish, the gizzard shad, in the resistance and resilience of aquatic food webs to perturbations in the form of large pulses of nutrients. They hypothesize that food webs with omnivorous fish, like these shad, are more stable (i.e., resistant and resilient) in repines to perturbations of allochthonous nutrients than are those without omnivorous fish. The enhanced stability might be due to the large steady supply of nutrients transported by omnivorous fish from sediments or to the additional trophic links formed by incorporating the omnivorous fish in the food webs. The objectives of this work are to test predictions generated by the omnivory-stability hypothesis and to determine the underlying mechanisms responsible for observed changed in stability. Replicated pond experiments will be performed to assess how fish influence resistance and resilience of food webs to pulses of nutrients, and if so, whether the mechanism is via nutrient-transport or via a food web-structure role, or both. Modeling will also be used to explore the role of omnivorous fish in the stability of aquatic food webs over a range of ecosystem structures and perturbation types.

奖项摘要迈克尔·J·瓦尼迈阿密大学提案编号：Deb-9982124 PI建议调查杂食性鱼类--胆鱼--在水生食物网对营养大脉冲形式的扰动的抵抗力和弹性中所起的作用。他们假设，与没有杂食性鱼类的食物网相比，爬行动物中有杂食性鱼类的食物网更稳定(即，抵抗力和弹性)。稳定性的提高可能是由于杂食性鱼类从沉积物中输送了大量稳定的营养物质，或者是由于将杂食性鱼类纳入食物网而形成了额外的营养联系。这项工作的目标是检验由杂食性稳定性假说产生的预测，并确定导致观察到的稳定性变化的潜在机制。将进行重复的池塘实验，以评估鱼类如何影响食物网对营养脉冲的抵抗力和弹性，如果是这样，机制是通过营养运输还是通过食物网结构作用，或者两者兼而有之。模拟还将用于探索杂食性鱼类在一系列生态系统结构和扰动类型的水生食物网稳定性中的作用。