Mating system evolution in sperm-heteromorphic Drosophila.
Mating system evolution in sperm-heteromorphic Drosophila.
复制标题
精子异形果蝇的交配系统进化。
DOI：
10.1016/s0022-1910(01)00070-1
复制
发表时间：
2001
影响因子：
2.2
通讯作者：
T. Markow
中科院分区：
文献类型：
--
作者：
R. Snook;T. Markow
在暗箱组的果蝇物种中，雄性表现出精子异型性，同时产生能够受精的长精子和不能受精的短精子。多种精子类型的产生引发了一个问题，即交配系统的相关性，如精子长度和数量的权衡以及雌性的交配行为，是否与之前在精子-单态系统中描述的相同。我们研究了三个暗箱属物种，D. pseudobscura， D. persimilis和D. affinis，它们的长受精精子长度差异很大，以测试精子长度与四个交配系统特征之间的关系：雄性性成熟年龄；精子数量;女性配偶;以及男性的生殖产出。在affinis中，雄性产生最长的受精精子，他们的性成熟被推迟，与其他两个物种相比，他们产生更少的长精子，如果长精子的生产成本很高的话。雌性亲缘蜻蜓虽然比其他两个物种的雌性获得的精子少，但在一次交配中，它们的交配频率并不高，也不会产生更少的后代。精子异型系统和精子单型系统之间的不同反应强调了雄性和雌性交配系统特征之间共同进化的复杂性。
In Drosophila species of the obscura group, males exhibit sperm-heteromorphism, simultaneously producing both long sperm, capable of fertilization, and short sperm that are not. The production of multiple sperm types calls into question whether mating system correlates, such as sperm length and number trade-offs and female remating behavior, are the same as previously described in sperm-monomorphic systems. We examine three obscura group species, D. pseudoobscura, D. persimilis, and D. affinis that differ significantly in the lengths of their long fertilizing sperm, to test predictions about the relationship between sperm length and four mating system characters: male age at sexual maturity; sperm number; female remating; and male reproductive output. In D. affinis, where males produce the longest fertilizing sperm, their sexual maturity is delayed and they produce fewer long sperm compared to the other two species, as predicted if long sperm are costly to produce. Female D. affinis, although they receive fewer sperm than females of the other two species, do not remate more frequently or produce fewer progeny from a single mating. Different responses between sperm-heteromorphic and sperm-monomorphic systems underscore the complex nature of the coevolution between male and female mating system characters.