Dissertation Research: Host Movement and Disease Dynamics: Interactions between Monarch Butterflies and a Protozoan Parasite

论文研究：宿主运动和疾病动态：帝王蝶和原生动物寄生虫之间的相互作用

• 批准号: 9700916
• 负责人: Donald Alstad
• 金额: $ 0.75万
• 依托单位: University of Minnesota-Twin Cities
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-07-01 至 1998-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9700916&HistoricalAwards=false
• 关键词: Dissertation; Research; Host; Movement; Disease

9700916 Alstad In natural populations, disease spread is likely to be affected by ecological, environmental, and genetic factors. Many groups of animals have seasonal migrations, which may strongly affect host-parasite interactions. This research examines interactions between monarch butterflies, Danaus plexippus, and an obligate protozoan parasite, Ophryocystis elektroscirrha. Three populations of North American monarchs exhibit varying degrees of migratory behavior, providing a unique opportunity to examine how geographic variation in disease prevalence relates to host movement patterns. For these populations, disease incidence is inversely related to host migratory distance. A non-migratory population in southern Florida shows 100% infection, the western migratory population is 60% infected, and the eastern migratory population, which travels the farthest distance, is less than 10% infected. This study will examine how population variation in disease prevalence is affected by host movement behavior, environmental differences between sites, and genetic factors related to host susceptibility or pathogen virulence. This study will produce data important for the conservation of monarchs, which have been threatened in recent years by habitat destruction at many overwintering sites. It will also improve understanding of how parasites interact with their hosts.

9700916 Alstad 在自然群体中，疾病传播很可能受到生态、环境和遗传因素的影响。 许多动物群体都有季节性迁徙，这可能会强烈影响宿主与寄生虫的相互作用。 这项研究探讨了帝王蝶（Danaus plexippus）和专性原生动物寄生虫（Ophryocystis elektroscirrha）之间的相互作用。 北美帝王蝶的三个种群表现出不同程度的迁徙行为，为研究疾病流行的地理变化与宿主移动模式之间的关系提供了独特的机会。 对于这些人群，疾病发病率与宿主迁徙距离成反比。 佛罗里达州南部的非迁徙人口感染率为100%，西部迁徙人口感染率为60%，而迁徙距离最远的东部迁徙人口感染率不到10%。这项研究将研究宿主移动行为、地点之间的环境差异以及与宿主易感性或病原体毒力相关的遗传因素如何影响疾病患病率的群体变异。 这项研究将为保护帝王蝶提供重要的数据，近年来，帝王蝶在许多越冬地点受到栖息地破坏的威胁。 它还将增进对寄生虫如何与其宿主相互作用的理解。