Efficiency of gamete usage in nature: sperm storage, fertilization and polyspermy
Efficiency of gamete usage in nature: sperm storage, fertilization and polyspermy
复制标题
DOI：
10.1098/rspb.2001.1854
复制
发表时间：
2002-03-07
影响因子：
4.7
通讯作者：
Markow, TA
中科院分区：
文献类型：
--
作者：
Snook, RR;Markow, TA
雄性和雌性的配子生产都可能非常昂贵，因此选择应该在最大限度地增加受精机会的同时将受精成本降至最低。然而，在对果蝇繁殖的实验室研究中，卵子无法产生成年后代的几率可能相当高，这表明雌性对配子利用的控制令人惊讶地低效。我们研究了自然界中假黑线虫的配子利用情况，并将我们的观察结果与实验室种群的结果进行了比较。在自然种群中，100%的产卵有效地产生成虫后代，受精完全是单精子的，这表明在自然界中，假黑卵蛾雌性对它们的繁殖保持着非常严格的控制，因此配子的利用非常有效。讨论了实验室配子利用效率低下的潜在原因，以及对精子竞争、性冲突和生殖障碍进化的实验室研究的潜在影响。此外，在这种精子异形的物种中，我们的观察明确地表明，在自然界和实验室中，只有长精子形态参与受精。
Gamete production for both males and females can be energetically expensive such that selection should maximize fertilization opportunities while minimizing fertilization costs. In laboratory studies of Drosophila reproduction, however, the failure of eggs to yield adult progeny can be quite high, suggesting that female control over gamete utilization is surprisingly inefficient. We examined gamete utilization in D. pseudoobscura from nature and compared our observations to those for laboratory populations. In natural populations 100% of oviposited eggs effectively produce adult progeny, and fertilization is exclusively monospermic, indicating that in nature, D. pseudoobscura females maintain a very strict control over their reproduction such that gamete usage is extremely efficient. The potential reasons for the inefficient gamete utilization in the laboratory, as well as the potential impact on laboratory studies of sperm competition, sexual conflict, and the evolution of reproductive barriers are discussed. Furthermore, in this sperm-heteromorphic species, our observations show definitively that in nature, as well as in the laboratory, only the long sperm morph participates in fertilization.