Cryptic reproductive isolation in the Drosophila simulans species complex.
Cryptic reproductive isolation in the Drosophila simulans species complex.
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模拟果蝇物种复合体中的隐蔽生殖隔离。
DOI：
10.1111/j.0014-3820.2001.tb01274.x
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发表时间：
2001
期刊：
影响因子：
--
通讯作者：
Coyne,JA
中科院分区：
文献类型：
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作者：
Price,CS;Kim,CH;Gronlund,CJ;Coyne,JA
在交配之后但在受精之前的生殖隔离形式可能是物种形成的重要组成部分，但很少被研究。我们在果蝇同种复合体内的三个杂交中检测了后交配、前合子生殖隔离。我们只允许雌性交配一次，观察并计算所有交配的时间，解剖一部分雌性以跟踪精子的储存和保留，检查受精后产卵的数量和孵化率，计算产生的所有后代，并测量交配后雌性的寿命。这三种杂交的特征都是异种受精的一组不同的隐蔽障碍。当D。同源雌性与D交配。即使在长时间的交配过程中，异种精子也很少被转移。相比之下，交配的D。与D类似的女性。毛毛虫通常太短，不能进行精子移植。然而，那些足够长的可以授精的精子涉及到许多精子的转移，但这些异种精子中只有一小部分由雌性储存，雌性产生的卵子也比国防部少。拟雌体与同种雄体交配。最后，当D。雌性毛滴虫与D。与男性相似，精子会大量转移和储存，但很快就会从生殖道中消失，因此利用效率很低。这些结果大大增加了这个经过充分研究的分支的生殖隔离机制的清单，也可能增加了可能有助于它们生殖隔离的进化过程的清单。
Forms of reproductive isolation that act after copulation but before fertilization are potentially important components of speciation, but are studied only infrequently. We examined postmating, prezygotic reproductive isolation in three hybridizations within theDrosophila simulansspecies complex. We allowed females to mate only once, observed and timed all copulations, dissected a subset of the females to track the storage and retention of sperm, examined the number and hatchability of eggs laid after insemination, counted all progeny produced, and measured the longevity of mated females. Each of the three hybridizations is characterized by a different set of cryptic barriers to heterospecific fertilization. WhenD. simulansfemales mate withD. sechelliamales, few heterospecific sperm are transferred, even during long copulations. In contrast, copulations ofD. simulansfemales withD. mauritianamales are often too short to allow sperm transfer. Those that are long enough to allow insemination, however, involve the transfer of many sperm, but only a fraction of these heterospecific sperm are stored by females, who also lay fewer eggs than doD. simulansfemales mated with conspecific males. Finally, whenD. mauritianafemales mate withD. simulansmales, sperm are transferred and stored in abundance, but are lost rapidly from the reproductive tract and are therefore used inefficiently. These results add considerably to the list of reproductive isolating mechanisms in this well‐studied clade and possibly to the list of evolutionary processes that could contribute to their reproductive isolation.