Sperm-limited fecundity in nematodes: How many sperm are enough?
Sperm-limited fecundity in nematodes: How many sperm are enough?
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DOI：
10.1111/j.0014-3820.2004.tb01687.x
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发表时间：
2004-03-01
期刊：
影响因子：
3.3
通讯作者：
Cutter, AD
中科院分区：
文献类型：
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作者：
Cutter, AD
贝特曼原则认为卵母细胞是生殖中的限制性配子，但在许多物种中都被违反了。秀丽隐杆线虫（Caelophabditis elegans）的自精雌雄同体提供了一个精子数量限制终生生殖输出的系统的例子，在这个物种中，由于精子产生的雄性先熟性，这反过来又延迟了受精的开始。这种生殖延迟形成了世代时间和总生育力之间权衡的基础，其中精子数量起着关键作用。我使用年龄结构的人口模型来描述精子的数量，最大限度地提高健身，幼虫发育时间和配子生产率。该模型预测的精子数量的演变与C。elegans提供的早熟幼虫精子生产的考虑。几个可检验的假设遵循的模型，关于自然选择和环境变化可能会影响精子生产模式之间的人口或物种具有类似的生殖模式。
The Bateman principle, which holds that oocytes are the limiting gamete in reproduction, is violated in a variety of species. Self-fertilizing hermaphrodites of the nematode Caenorhabditis elegans provide an example of a system in which sperm number limits lifetime reproductive Output, in this species due to the protandrous nature of sperm production that in turn delays the onset of fertilization. This reproductive delay forms the basis of a trade-off between generation time and total fecundity, in which sperm number plays a pivotal role. I use an age-structured population model to describe the number of sperm that maximize fitness, given larval development time and rates of gamete production. The model predicts the evolution of sperm numbers that are consistent with empirical data for C. elegans provided that precocious larval sperm production is taken into account. Several testable hypotheses follow from the model regarding how natural selection and environmental variation may influence patterns of sperm production among populations or species with a similar mode of reproduction.