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RUI: The Relationship between Gamete Production and Reproductive Success

RUI：配子产生与生殖成功之间的关系

基本信息

批准号：
9416548
负责人：
Philip Yund
金额：
$ 19.7万
依托单位：
University of New Orleans
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
1995
资助国家：
美国
起止时间：
1995-02-01 至 1998-08-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=9416548&HistoricalAwards=false
关键词：
RUI Relationship between Gamete Production

项目摘要

9416548 Yund PROJECT ABSTRACT This proposal will explore the impact of population density on the relationship between gamete production and reproductive success in a colonial ascidian. Previous research has found that variation in population density will affect the relationship between gamete production and reproductive success differently in male and female-phase colonies. The relationship between production and the number of fertilization obtained by a colony is expected to be linear in competitive situations (high population densities), but plateau in noncompetitive situations (low population densities) at the male gamete production level that allows a male to fertilize all of the eggs in his vicinity. In contrast, the relationship between egg production and the number of offspring produced by a colony is expected to be linear at low population densities (where male gamete limit the number of eggs fertilized), but plateau at high population densities due to constraints on the number of embryos that colonies can brood. These hypotheses will be tested in this research project by establishing experimental populations of ascidians that vary in gamete production under two density conditions and assaying male and female reproductive success. Male reproductive success will be assayed by using allozyme markers to assign paternity, while female reproductive success will be assayed by directly counting the proportion of eggs fertilized in each brood . This study will contribute to our knowledge of benthic marine organisms by examining the selective pressures that fertilization processes can exert on gamete allocation patterns.

小行星9416548 项目摘要这项建议将探讨人口密度对配子生产和繁殖成功之间的关系在殖民地海鞘的影响。以往的研究发现，种群密度的变化会影响配子产生和繁殖成功之间的关系在男性和女性阶段的殖民地不同。在竞争性情况下（高种群密度），产量和群体受精数量之间的关系预计是线性的，但在非竞争性情况下（低种群密度），在雄性配子产量水平上，雄性可以使附近的所有卵子受精。相比之下，在低种群密度下（其中雄性配子限制受精卵的数量），产卵量和群体产生的后代数量之间的关系预计是线性的，但由于对群体可以孵化的胚胎数量的限制，在高种群密度下达到平台。这些假设将在本研究项目中进行测试，通过建立海鞘的实验种群，在两种密度条件下的配子生产和测定男性和女性的生殖成功。雄性繁殖成功率将通过使用等位酶标记来分配亲子关系来测定，而雌性繁殖成功率将通过直接计数每窝中受精卵的比例来测定。这项研究将有助于我们的底栖海洋生物的知识，通过研究受精过程中可以施加配子分配模式的选择性压力。