Grazing and Dynamics of Grazer Populations in a Temperate Fjord

温带峡湾的放牧和食草动物种群动态

• 批准号: 9202657
• 负责人: Bruce Frost
• 金额: $ 8.5万
• 依托单位: University of Washington
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-05-01 至 1994-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9202657&HistoricalAwards=false
• 关键词: Grazing; Dynamics; Grazer; Populations; Temperate

In Dabob Bay (Washington), a temperate fjord, the annual cycles of phytoplankton standing stock and production rate exhibit spectacular increases (phytoplankton blooms) in spring and autumn, indicating lack of control by grazer populations. Yet virtually all organic matter produced by the phytoplankton during blooms is ultimately consumed by grazers. Moreover, a major fraction of the grazing (about 67% on an annual basis) appears to be due to macrozooplankton suspension-feeders, with microzooplankton being secondary grazers. A conceptual model of grazing in Dabob Bay was developed, hypothesizing the identities of the macro- and microzooplankton grazers and postulating mechanisms for the approximate annual balance between phytoplankton growth and grazing. A field test of the conceptual model was developed and carried out on three extended research cruises to Dabob Bay in 1990-91. This project will complete the analysis of samples and data, and produce a synthesis. By direct measuerements this study will provide quanitative assessment of mechanisms and rates of processes governing the dynamics of phytoplankton production and its fate in a highly productive coastal pelagic ecosystem.

在温带峡湾的达博布湾（华盛顿），春天和生产率的年度周期在春季和秋季表现出壮观的增加（浮游植物盛开），表明格雷泽人群缺乏控制。 然而，实际上，浮游植物期间浮游植物生产的所有有机物最终都被放牧者消耗。 此外，放牧的大部分（每年约为67％）似乎是由于Macrozooplankton悬挂式进料机，Microzooplankton是次要放牧者。 开发了Dabob Bay放牧的概念模型，假设宏观和微Zooplankton放牧者的身份以及假定的机制，用于浮游植物生长与放牧之间的年平衡。 1990 - 91年间，开发了对达博布湾的三次扩展研究巡游，开发了对概念模型的现场测试。 该项目将完成对样品和数据的分析，并产生合成。通过直接测量，这项研究将对管理浮游植物生产动态的机制和工艺的速度和速率进行Quanitality评估，并在高生产力的沿海上层生态系统中进行命运。