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

该项目将检查树上蚊子伊蚊的反应 triseriatus，根据当地气候条件的变化，具有特定的关注降水模式和可变休眠的演变卵孵化前。该项目的中心假设是相对干燥的栖息地应该有更高的干燥概率，这应该会促进之前延迟的更大变化的演变孵化。与此问题相关的问题涉及协会个体健康的其他方面（例如幼虫发育率、成虫体型、对拥挤的敏感性）和孵化延迟，以及种群孵化率变异性与卵的孵化受到高密度的抑制的趋势幼虫。核心问题将通过比较 23 个国家的孵化率来解决。从新泽西州到北卡罗来纳州的人口。所有这些人口在这段时间内经历了类似的温度状况过去三十年，但每年的变化幅度高达两倍沉淀。其中，孵化变化最大的两个种群次，并且变化最小且最早孵化的两个将是检查以评估与其他特征的关联程度影响健身。我们假设孵化时间变化为在最容易发生解剖的环境中最重要，而其他与健康相关的性状将主要围绕孵化延迟进行构建在这些人群中。我们还将比较来自以下来源的鸡蛋的敏感性：这四个种群都存在幼虫，预计孵化时间变化水平最低的种群应表现出最大程度的卵子敏感性。如果可以在实验室中发现蛋孵化策略的差异，将通过比较气候的重要性来进行测试来自两个最不同人群的实验队列的成功，以及混合群体，在野外条件下的模拟栖息地中