Dissertation Research: Examining the Effects of Large Scale Migration on Local Population and Community Dynamics in Larval Odonates

大规模的运动模式可以影响种群内部和种群之间的大小结构的时空发生，但很少有研究明确说明这些模式如何影响相互作用，如同类相食和行会内捕食（IGP）。黄腹小鲈是一种迁徙的物种，经常在无鱼的池塘中扮演顶级捕食者的角色。这些属性使A。junius是研究迁徙对种群大小结构和当地种群/群落动态影响的理想物种。我们概述了实验与A。junius和其他共生的有齿类幼虫评估这些影响。第一节测试：a）大小变化对配对A. juniuslarvae和同类相食的可能性A. B）大小结构和温度这两个季节变化因子对中华绒螯蟹种群同类相食的影响。第二节测试了种群大小结构对顶捕食者（A. junius）幼虫的影响。junius）上：a）三种群IGP系统中中间捕食者和共享猎物的生存; B）三种群IGP系统中密度介导的相互作用和性状介导的相互作用对风险降低的相对贡献。

Large scale movement patterns can influence the spatio-temporal occurrence ofsize-structure within and between populations but few studies explicitly address howthese patterns affect interactions such as cannibalism and intraguild predation (IGP). Thedragonfly Anax junius is a species that migrates and often assumes the role of top-predator in fishless ponds. These attributes make A. junius an ideal species foraddressing the influence of migration on population size structure and localpopulation/community dynamics. We outline experiments with A. junius and other co-occurring odonate larvae evaluating these effects.Section I tests: a) the effects of size variation on cannibalism in paired A. juniuslarvae and the likelihood of cannibalism within and between cohorts of A. junius;and b) the effects of size-structure and temperature, two seasonally variablefactors, on cannibalism in populations of A. junius larvae.Section II tests the effects of population size-structure in a top predator (A. junius)on: a) the survival of intermediate predators and shared prey in a three speciesIGP system; and b) the relative contributions of density mediated interactions andtrait mediated interactions on risk reduction in a three species IGP system.