Experimental Analysis of the Dynamic Effects of a Refuge

避难所动态效应的实验分析

• 批准号: 8717482
• 负责人: William Murdoch
• 金额: $ 16.06万
• 依托单位: University of California-Santa Barbara
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1988
• 资助国家: 美国
• 起止时间: 1988-01-01 至 1990-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8717482&HistoricalAwards=false
• 关键词: Experimental; Analysis; Dynamic; Effects; Refuge

This research is aimed at determining the consequences of a physical refuge upon the dynamics of a predator-prey system. Red scale is pest of citrus that is controlled by the parasitoid Aphytis in southern California. A refuge population of scale exists, to an extent that varies among cultivars, in the interior of the citrus tree. Citrus cultivars also vary in the scale load they carry on exterior foliage and fruit. The hypothesis to be tested is that a key to the stability of scale density on the foliage is the extent to which the refuge population is developed. An extensive survey of citrus groves will be conducted to test this hypotheses in which both the refuge and exterior populations will be sampled. A series of experiments aimed at providing a mechanistic explanation for between-cultivar variation in terms of mortality due to natural enemies and crawler migration rates will be done. Using this information, a model that predicts the influence of refuge populations on exterior populations will be developed. Red scale-Aphytis interaction is considered a model system for studying the effect of a physical refuge on population dynamics. The impact of the refuge in terms of effect on population size will be assessed and the factors determining the contribution of the refuge to total recruitment will be quantified.

这项研究的目的是确定物理避难所对捕食者-被捕食者系统动态的影响。 红鳞病是柑橘类害虫，由加利福尼亚州南部的寄生蜂蚜虫控制。 柑橘树内部存在一定规模的避难种群，其程度因品种而异。 柑橘品种的外部叶子和果实的鳞片负荷也有所不同。 要检验的假设是，树叶上鳞片密度稳定性的关键是避难种群的发展程度。 将对柑橘园进行广泛的调查来检验这一假设，其中将对避难所和外部种群进行采样。 将进行一系列实验，旨在为天敌和爬虫迁移率导致的品种间死亡率差异提供机械解释。 利用这些信息，将开发一个预测避难所人口对外部人口影响的模型。 红鳞-阿菲蒂斯相互作用被认为是研究物理避难所对种群动态影响的模型系统。 将评估避难所对人口规模的影响，并量化决定避难所对总招募贡献的因素。