CLIMATIC EFFECTS ON MOSQUITO EGG HATCH PATTERNS

气候对蚊卵孵化模式的影响

• 批准号: 2005728
• 负责人: Todd Philip Livdahl
• 金额: $ 11.03万
• 依托单位: CLARK UNIVERSITY (WORCESTER, MA)
• 依托单位国家: 美国
• 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/2005728
• 关键词: Aedes; animal ecology; animal population study; climate; life cycle; statistics /biometry

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

这个项目将研究树栖蚊子伊蚊的反应 tristeriatus，在当地气候条件的变化，与一个特定的 侧重于降水模式和可变休眠的演变 在鸡蛋孵化之前。 该项目的核心假设是， 干燥的栖息地应该有更高的干燥概率， 应该促进更大的变化，在延迟之前， 孵化 与这一问题有关的问题是， 个体适应性的其他方面（如幼虫发育率、成虫 身体大小，拥挤的敏感性）与孵化延迟，以及 种群孵化率的变异性与 卵被高密度抑制孵化的趋势 幼虫 核心问题将通过比较23个国家的孵化率来解决。 分布于从新泽西到北卡罗来纳州。 所有这些 人口经历了可比的温度制度期间， 过去三十年，但它们每年的变化高达两倍 降水 其中，两个种群的孵化率最高 时间和两个最小的变量和最早的孵化将是 检查以评估与其他特征的关联程度 影响健康。 我们假设孵化时间的变化 最重要的是在最容易解剖的环境中， 健康相关的性状将主要围绕孵化延迟来构建 在这些人群中。 我们还将比较鸡蛋的敏感性， 这四个种群的幼虫的存在，预计， 孵化时间变异水平最低的种群应表现出 最大程度的鸡蛋敏感性。 如果能在实验室中发现卵孵化策略的差异， 气候的重要性的测试将通过比较 来自两个最不同人群的实验组群的成功， 以及混合队列，在模拟栖息地置于现场条件下，