Further Studies of Disturbance Reproductive Effort, and Succession Across a Depth Gradient in a Southern California Kelp Forest

南加州海带森林中干扰繁殖努力和跨深度梯度的演替的进一步研究

• 批准号: 9101506
• 负责人: Paul Dayton
• 金额: $ 43万
• 依托单位: University of California-San Diego Scripps Inst of Oceanography
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-10-15 至 1995-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9101506&HistoricalAwards=false
• 关键词: Further; Studies; Disturbance; Reproductive; Effort

This continuing research program includes six topics: 1) a 20-year perspective of several scales of disturbance on three species of kelp that will be continued with long term demographic studies in five areas; 2) thinning experiments searching for thresholds necessary for understory persistence in different regions; 3) evaluation of intra- and interspecific density effect on kelp growth, reproduction, recruitment, and survivorship; 4) an experimental evaluation of fundamental vs. realized niches of kelps in the presence of a strong competitive dominant, and 5) the effects of long shore and cross shore gradients, especially light and temperature with regard to succession theory. The investigators are also (6) using outplants to evaluate some adaptive tactics of four species of relatively rare kelps that have very different life histories. For most of the experiments they will use triplicated clearings at each of four depths and modules with different densities of sporophytes to evaluate regional and density thresholds on growth, time and intensity of reproduction, recruitment, and survivorship.

这项持续研究计划包括六个主题：1）对三种海带的几种规模干扰的 20 年展望，并将继续在五个领域进行长期人口统计研究； 2）间伐实验，寻找不同地区林下持久性所需的阈值； 3) 评估种内和种间密度对海带生长、繁殖、补充和存活的影响； 4）在存在强大竞争优势的情况下对海带的基本生态位与已实现的生态位进行实验评估，以及5）长岸和跨岸梯度的影响，特别是关于演替理论的光和温度。研究人员还 (6) 使用外植体来评估四种相对稀有的海带的一些适应性策略，这些海带的生活史截然不同。 对于大多数实验，他们将在四个深度和模块中的每一个处使用三次空地，具有不同的孢子体密度，以评估生长、繁殖时间和强度、招募和存活的区域和密度阈值。