Evolutionary consequences of interspecific hybridization: Daphnia resting egg banks as biological archives

种间杂交的进化后果：水蚤休眠卵库作为生物档案

• 批准号: 27051794
• 负责人: Professor Dr. Klaus Schwenk
• 金额: --
• 依托单位: Institut für Umweltwissenschaften
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2006
• 资助国家: 德国
• 起止时间: 2005-12-31 至 2006-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/27051794?language=en
• 关键词: Evolutionary; consequences; interspecific; hybridization; Daphnia

Despite many studies on natural interspecific hybridization among plants and animals, few cover long enough time periods to describe the origin and fate of hybrid lineages or to associate levels of interspecific gene flow with environmental conditions. Here we propose to extend our population genetic studies of a Daphnia species complex using resting eggs isolated from sediments of Lake Constance and Lake Greifensee. Initially, only one species (D. hyalina) was found in both lakes (before 1950), later on D. galeata invaded both lakes which resulted subsequently in interspecific hybridization. Based on our preliminary data which provide evidence for a massive hybrid sweep in both populations, we aim to describe the consequences of hybridization (e.g. introgression) during the course of the 20th century (~100 years) using nuclear and mitochondrial DNA data. In addition, we will hatch individuals from several time periods (1960¿s, 1970¿s, 1990¿s and 2000¿s) and test for differential hatching and phenotypic variation over a time period of 40 years. This combined approach of population genetics and phenotypic analyses using resting eggs from lake sediments will allow us to measure the level of reproductive isolation, gene flow, and selection in a species complex during the past century.

尽管对动植物中的自然杂交进行了许多研究，但很少有人涵盖长时间的tigh tigh tiods来描述RRBR ID谱系的起源和命运，或者提出种间基因流量的水平与环境条件相关联。从湖泊的沉积物和湖湖绿湖（D. hyalina）中分离出的物种复合物卵（在1950年之前）S s卵子（D. hyalina），后来，Galeata入侵了两个湖泊，这两个湖泊都基于我们的预定数据，从而导致了亚种下的亚种下的亚种下的亚物质杂交杂交这提供了在20个中心（〜100年）中使用Nucle和线粒体DNA数据的两种普及（例如渗入）的杂种扫描的证据。 1970年代，1990 s和2000 s），并在40年的时间内进行差异孵化和表型。隔离，并在过去一个世纪中选择一种物种复合物。