The effect of an inversion system and the time interval between matings on postcopulatory sexual selection in the seaweed fly, Coelopa frigida
The effect of an inversion system and the time interval between matings on postcopulatory sexual selection in the seaweed fly, Coelopa frigida
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DOI：
10.1038/sj.hdy.6800713
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发表时间：
2005-08-01
期刊：
影响因子：
3.8
通讯作者：
Gilburn, AS
中科院分区：
文献类型：
--
作者：
Blyth, JE;Gilburn, AS
海藻蝇，Coelopa colgida，展示LMSP。大型染色体倒位系统通过杂种优势影响许多性状，包括卵到成虫的存活率。因此，隐秘的女性配偶选择也有相当大的潜力基于精子核型进行操作。在这里，我们研究了时间间隔和染色体倒位核型对交配后性别选择的影响。同核型雌虫分别与同核型雄株和相反同核型雄株交配。交配的顺序是不同的，所以神秘的雌性配偶选择可以与LMSP协同或对抗地进行。当交配之间有24小时的时间间隔时，无论雄性交配的顺序如何，都会发现LMSP。然而，当雄鸟快速相继交配时，交配顺序很重要。当LMSP和神秘的雌性配偶选择协同工作时，发现LMSP的水平很高。然而，当相反的同核型的雄性先交配时，则观察到先雄性精子优先。这表明，一夫多妻制的女性可能会对父子关系产生偏见，但只有在快速相继交配的情况下才会这样。因此，种群密度可能会影响交配后性别选择的运作。
The seaweed fly, Coelopa frigida, exhibits LMSP. A large chromosomal inversion system affects many traits including egg-to-adult viability via heterosis. Consequently, there is also considerable potential for cryptic female mate choice to operate on the basis of sperm karyotype. Here, we investigated the effect of time interval and chromosomal inversion karyotype on postcopulatory sexual selection. Homokaryotypic females were mated with a male of the same and a male of the opposite homokaryotype. The order of the matings was varied so cryptic female mate choice could operate either in concert or antagonistically with LMSP. LMSP was found when there was a 24 h time interval between matings, irrespective of the order in which the males were mated. However, when the males were mated in quick succession the order of mating was important. When LMSP and cryptic female mate choice work in concert a high level of LMSP was found. However, when the male of opposite homokaryotype mated first, then first male sperm precedence was observed. This suggests that polyandrous females might be able to bias paternity but only when matings occur in quick succession. Consequently, population density is likely to affect the operation of postcopulatory sexual selection.