CLIMATIC EFFECTS ON MOSQUITO EGG HATCH PATTERNS

气候对蚊卵孵化模式的影响

基本信息

批准号：
2803071
负责人：
Todd Philip Livdahl
金额：
$ 5.52万
依托单位：
CLARK UNIVERSITY (WORCESTER, MA)
依托单位国家：
美国
项目类别：
财政年份：
1997
资助国家：
美国
起止时间：
1997-05-01 至 2000-04-30
项目状态：
已结题

来源：
https://reporter.nih.gov/project-details/2803071
关键词：
Aedes animal ecology animal population study climate life cycle statistics /biometry

项目摘要

This project will examine responses of the treehold mosquito, Aedes triseriatus, to variation in local climatic conditions, with a particular focus on precipitation patterns and the evolution of variable dormancy prior to egg hatch. The central hypothesis of the project is that relative dry habitats should have a higher probability of desiccation, which should promote the evolution of greater variation in delays before hatching. Questions associated with this issue concern the association of other aspects of individual fitness (e.g. larval development rate, adult body size, sensitivity to crowding) with hatch delay, as well as the relationship between the variability in hatch rate for a population and the tendency of eggs to be inhibited from hatching by high densities of larvae. The central questions will be addressed by comparing hatch rates for 23 populations from New Jersey to North Carolina. All of these populations have experienced comparable temperature regimes during the last three decades, but they vary by as much as a factor of two in annual precipitation. Of these, two populations with the most variable hatch times and two with the least variable and earliest hatching will be examined to assess the degree of association with other features influencing fitness. We hypothesize that hatch time variation has been most important in the most dissection-prone environments, and that other fitness-related traits will be most heavily structured around hatch delay in those populations. We will also compare the sensitivity of eggs from these four populations to the presence of larvae, anticipating that the populations with the lowest levels of hatch time variation should exhibit the largest degree of egg sensitivity. If differences in egg hatching strategies can be found in the laboratory, a test for the importance of climate will be performed by comparing the success of experimental cohorts from the two most different populations, as well as hybrid cohorts, in simulated habitats placed in field conditions

该项目将检查埃德斯蚊子的回答 triseriatus，在当地气候条件下变化，特定专注于降水模式和可变休眠的演变在卵舱口之前。该项目的核心假设是相对干燥的栖息地应具有更高的干燥概率，这应该促进延误的更大变化的演变孵化。与此问题相关的问题涉及的关联个体健身的其他方面（例如幼虫发展率，成人身体大小，对拥挤的敏感），舱口延迟以及人群的孵化率变异性与卵的趋势被抑制高密度的孵化幼虫。中心问题将通过比较23的孵化率来解决从新泽西到北卡罗来纳州的人口。所有这些人口在过去三十年，但它们每年的差异高达两倍沉淀。其中，两个人口最多可变时间和两个最小且最早的孵化检查以评估与其他功能的关联程度影响健身。我们假设舱口时间变化已经在最容易解剖的环境中最重要的是与健身相关的特征将在舱口延迟周围最严重地结构在这些人群中。我们还将比较鸡蛋的灵敏度这四个人群到存在幼虫的存在，预计孵化时间变化水平最低的种群应显示卵灵敏度最大。如果在实验室中发现卵孵化策略的差异，对气候重要性的测试将通过比较从两个最不同的人群中的实验人群成功，以及混合队列，在放置在现场条件下的模拟栖息地中