Determinants of sperm precedence in a noctuid moth Heliothis virescens:: a role for male age
Determinants of sperm precedence in a noctuid moth Heliothis virescens:: a role for male age
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DOI：
10.1046/j.1365-2311.2001.00336.x
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发表时间：
2001-08-01
影响因子：
2.2
通讯作者：
LaMunyon, CW
中科院分区：
文献类型：
--
作者：
LaMunyon, CW
1. 夜蛾 Heliothis virescens F. 的雌性交配不止一次。因此，来自两个或多个雄性的精子通常在雌性生殖道内竞争受精。这些卵子通常仅由一名雄性的精子受精，该雄性要么是雌性的最后一个配偶，要么是较早的配偶。两次交配的雌性只储存一次射精量的受精精子（eupyrene），但储存了近两次射精量的非受精精子形态（apyrene），这种精子被认为在精子竞争中发挥着作用。通过检查随亲子关系而变化的因素，研究了 H. virescens 的精子利用机制，这些因素是根据等位酶变异分配的。影响因素包括男性和女性的体重和年龄、男性生殖器特征、精子包的大小以及女性储存的精子数量。3．雄性通常会获得精子优先权；雄性通常会获得精子优先权。这是第二只雄性的可能性几乎是第一只雄性的两倍。研究发现，有两个因素与亲子关系存在显着差异：女性体重和男性年龄。如果雌性较大并且雄性比雌性的第一个配偶年龄更大，则第二个交配的雄性更有可能获得精子优先权。4。讨论了男性年龄和女性质量对精子利用机制的几种假设模型的重要性。
1. Females of the noctuid moth Heliothis virescens F. mate more than once. Thus, sperm from two or more males normally compete for fertilisations within the female reproductive tract. The eggs are typically fertilised by sperm from only one male, either the female's last mate or an earlier mate. Twice-mated females store only one ejaculate's worth of fertilising sperm (eupyrene) but nearly two ejaculates' worth of a nonfertilising sperm morph (apyrene), which is thought to play a role in sperm competition.2. The mechanism of sperm use in H. virescens was investigated by examining factors that vary with paternity, which was assigned based on allozyme variation. The factors included male and female body masses and ages, male genital characters, the size of the sperm package, and the number of sperm stored by the female.3. One male typically gained sperm precedence; this was nearly twice as likely to be the second male as it was to be the first. Two factors were found to vary significantly with paternity: female mass and male age. The second male to mate was more likely to gain sperm precedence if the female was larger and if the male was older than the female's first mate.4. The significance of male age and female mass to several hypothetical models of the mechanism of sperm use is discussed.