Dissertation Research: Intraspecific Phylogenetics of a Crayfish: Testing a Nested Analysis of Population Structure in a one Dimensional Habitat.

0073155克兰德尔有几种现象可以导致目前在自然种群中观察到的遗传模式。 一个强大的方法，已开发出选择这些不同的现象是嵌套分析程序。 虽然这种方法已成功地用于几种生物，但它仅适用于陆生生物。 在对占据水生生境的生物适用该方法时，可能需要对该方法作某些修改。 本研究的目的是检查嵌套分析程序的情况下，水生生物和概述最合适的方法来分析这些类型的人口的数据。 这项研究将利用从整个密苏里州收集的60个不同的小龙虾种群的DNA序列来测试修改水生生物程序的适当性。 将进行两种程序变化：1）标准方法（地理坐标）和2）水生生物使用的修改（河中距离）。 然后将比较这两种方法的结果，以确定推断现象中的显著偏差。 这项研究将允许嵌套分析程序适当扩展到水生生物。 如果没有这样的研究，使用标准方法对水生生物的遗传结构作出的推论可能会产生误导。

0073155CrandallThere are several phenomena that can lead to currently observed genetic patterns in natural populations. One powerful method that has been developed to choose among these various phenomena is the nested-analysis procedure. While this method has been utilized successfully in several organisms it has only been applied to land dwelling organisms. Certain modifications to the methodology may be needed when it is applied to organisms occupying aquatic habitats. The goals of this study are to examine the nested-analysis procedure for the case of aquatic organisms and outline the most appropriate ways to analyze data from these types of populations. This study will utilize DNA sequences from 60 different crayfish populations collected from throughout Missouri to test the appropriateness of modifying the procedure for aquatic organisms. Two variations of the procedure will be conducted: 1) the standard methodology (geographic coordinates) and 2) a modification for use with aquatic organisms (in-river distances). Results of the two methods will then be compared for significant deviations in the inferred phenomena. This study will allow for the proper extension of the nested-analysis procedure to aquatic organisms. Without such a study, the inferences made about the genetic structure of aquatic organisms using standard methodologies may be misleading.