On the Significance of Doliolids as Consumers and Producers

论多利奥利德作为消费者和生产者的意义

• 批准号: 9633401
• 负责人: Gustav-Adolf Paffenhofer
• 金额: --
• 依托单位: Skidaway Institute of Oceanography
• 依托单位国家: 美国
• 项目类别: Continuing grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-11-01 至 2000-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9633401&HistoricalAwards=false
• 关键词: Significance; Doliolids; Consumers; Producers

9633401 Paffenhofer This project will investigate the ability of doliolids (Tunicata, Thaliacea) to control the abundance of protozoa and free-spawning calanoid copepods. Pelagic tunicate feeding rates have been difficult to quantify, particularly for Thaliacea. In this work, Drs. Paffenhofer and Verity will quantify simultaneously the feeding, growth and reproduction rates of doliolids, which repeatedly have constituted a major component of neritic zooplankton in temperate and subtropical waters. The main hypotheses are that:(1) doliolid assemblages above ~ 600 large zooids m -3 are able to control phytoplankton, protozooplankton and free- spawning calanoids, and (2) that such high concentrations of large doliolids are rapidly attained by intense reproduction of two consecutive asexual stages, and high individual grown rates. The significance of these studies is several fold: first, to obtain environmentally-realistic and simultaneous information on rates of consumption and production of the different doliolid zooids; second, determine experimentally at which concentrations doliolids control phytoplankton, protozooplankton and free-spawning calanoids; third, develop a model describing the direct and indirect effects which a doliolid assemblage can have on these prey populations. ***

9633401 Paffenhofer 该项目将研究多利奥利科动物（被囊纲、海藻纲）控制原生动物和自由产卵桡足类动物丰度的能力。远洋被囊动物的摄食率很难量化，特别是海藻纲。在这项工作中，博士。 Paffenhofer 和 Verity 将同时量化多利奥利鱼的摄食、生长和繁殖率，这些动物多次构成温带和亚热带水域浅海浮游动物的主要组成部分。主要假设是：（1）超过~600个大型藻类m -3 的水滴虫组合能够控制浮游植物、原生浮游动物和自由产卵的卡拉类，（2）如此高浓度的大型水滴虫是通过两个连续无性阶段的强烈繁殖和高个体生长率而迅速获得的。这些研究的意义有几个方面：首先，获得关于不同多利奥利德动物的消耗和生产速率的环境现实和同步信息；其次，通过实验确定多利奥利德控制浮游植物、原生浮游动物和自由产卵的卡拉类的浓度；第三，开发一个模型来描述多利奥利德组合对这些猎物种群可能产生的直接和间接影响。 ***