Clonal erosion in overwintering populations of Daphnia pulex

水蚤越冬种群的克隆侵蚀

基本信息

项目摘要

Daphnia have a dual reproduction mode including parthenogenetic reproduction during favourable environmental conditions as well as sexual reproduction when environmental conditions deteriorate e.g. in the fall. Two different overwintering strategies exist in Daphnia: Daphnia can invest in survival and overwinter as parthenogenetic adults and/or they can invest in reproduction and overwinter as sexually produced, diapause eggs (ephippia). Both strategies co-exist in Daphnia pulex populations from lakes that provide suitable conditions for survival during winter (= do not freeze all the way to the bottom). In this project I want to investigate the seasonal fluctuations of the clonal composition over 24 months in such a Daphnia pulex field population. I am interested in whether there is clonal erosion due to selection or random drift during the winter months and if the genotypic variability is restored during spring from the resting egg bank. I want to investigate whether different clones of Daphnia invest differently in survival and reproduction and may be selected for either strategy. This project focuses on the analyses of genotypic diversity, but from combining the population genetic results with ecophysiological data I expect synergisms and a deeper insight into the evolution of alternative survival- and reproductive strategies.
水蚤具有双重生殖模式,包括在有利的环境条件下的孤雌生殖以及在环境条件恶化时(例如在秋季)的有性生殖。水蚤存在两种不同的越冬策略:水蚤可以投资于生存和越冬作为孤雌生殖的成年人和/或他们可以投资于繁殖和越冬作为有性生产,滞育卵(ephippia)。这两种策略共存于湖泊中的蚤状水蚤种群中,这些湖泊为冬季的生存提供了合适的条件。在这个项目中,我想调查的季节性波动的克隆组成超过24个月,在这样的蚤状蚤现场人口。我感兴趣的是,在冬季的几个月里,是否存在由于选择或随机漂移而导致的克隆侵蚀,以及基因型变异是否在春季从休眠卵库中恢复。我想调查不同的水蚤克隆是否在生存和繁殖方面有不同的投资,并可能被选择用于任何一种策略。这个项目的重点是基因型多样性的分析,但从结合人口的遗传结果与生理生态数据,我希望协同作用和更深入地了解替代生存和生殖策略的演变。

项目成果

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Privatdozentin Dr. Kathrin Lampert其他文献

Privatdozentin Dr. Kathrin Lampert的其他文献

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{{ truncateString('Privatdozentin Dr. Kathrin Lampert', 18)}}的其他基金

Genetische Populationsstruktur beim Tùngarafrosch Physalaemus pustulosus: verhaltensökologische Ursachen der genetischen Musterbildung
坦加尔非洲青蛙 Physalaemus pustulosus 的遗传种群结构:遗传模式形成的行为生态原因
  • 批准号:
    5387097
  • 财政年份:
    2002
  • 资助金额:
    --
  • 项目类别:
    Research Fellowships

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