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Dissertation Research: The Importance of the Egg Bank to the Genetics and Demography of a Resident Zooplankton Population

论文研究：卵库对浮游动物种群遗传学和人口统计学的重要性

基本信息

批准号：
0105009
负责人：
Robert Megard
金额：
$ 0.32万
依托单位：
University of Minnesota-Twin Cities
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2001
资助国家：
美国
起止时间：
2001-06-15 至 2003-05-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=0105009&HistoricalAwards=false
关键词：
Dissertation Research Importance Egg Bank

项目摘要

An intriguing reproductive feature of Daphnia and other Cladocera in lake plankton is that they produce dormant eggs that can hatch after many years in lake sediments. Dormant Daphnia eggs in lake sediment are a zoological analog to the "seed banks" of terrestrial plants in soils. Dormant eggs in surface sediment are a reservoir of genetic diversity for active populations, and older eggs in deeper sediments are a record of genetic structure in past populations. This project will analyze the genetic composition of the Daphnia egg bank in sediments from a Minnesota lake to evaluate whether the population has evolved in response to natural selection imposed by predation by rainbow trout that have been stocked annually for the past 40 years. It will 1) compare the genetic composition of the egg bank at times in the past with that of the active resident population and 2) estimate the effects of hatching of dormant eggs in surface sediment on the demography of the active population. A novel feature is that for the past decade this lake has been monitored the genetics and demography of active zooplankton populations, permitting evaluation of the linkages between active populations and the pool of dormant eggs. The goal is to link short-term variations of genetic diversity to long-term evolutionary dynamics.

水蚤和其他枝角类在湖泊浮游生物中的一个有趣的繁殖特征是，它们产生休眠的卵，这些卵可以在湖泊沉积物中孵化多年。湖泊沉积物中的潜水蚤卵是土壤中陆生植物“种子库”的动物学模拟物。表层沉积物中的休眠卵是活跃种群遗传多样性的储存库，而深层沉积物中较老的休眠卵是过去种群遗传结构的记录。该项目将分析明尼苏达州湖泊沉积物中水蚤卵库的遗传组成，以评估种群是否在过去40年来每年放养的虹鳟鱼捕食所施加的自然选择中进化。它将1）比较过去几次卵库的遗传组成与活跃的常住种群的遗传组成，2）估计在表层沉积物中孵化休眠卵对活跃种群人口统计学的影响。一个新的特点是，在过去的十年里，这个湖一直监测活跃的浮游动物种群的遗传学和人口统计学，允许活跃的种群和休眠卵池之间的联系进行评估。目标是将遗传多样性的短期变化与长期进化动态联系起来。