Testing the Viviparity-Driven-Conflict Hypothesis: Parent-Offspring Conflict and the Evolution of Reproductive Isolation in a Poeciliid Fish
Testing the Viviparity-Driven-Conflict Hypothesis: Parent-Offspring Conflict and the Evolution of Reproductive Isolation in a Poeciliid Fish
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DOI：
10.1086/592999
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发表时间：
2008-12-01
影响因子：
2.9
通讯作者：
Travis, Joseph
中科院分区：
文献类型：
--
作者：
Schrader, Matthew;Travis, Joseph
在母体投资水平上，胎生的进化增加了母亲和后代之间基因冲突的可能性。生动性驱动的冲突假说预测，这种冲突将推动具有不同交配系统的种群之间不对称生殖隔离的进化。我们用不同多夫制水平的一种棘鱼种群之间的杂交来检验这一假设。我们的研究结果支持了反向杂交中自然流产率不对称的预测，在相对单雄种群的雌性和相对多雄种群的雄性之间的杂交中，自然流产率最高。后代大小的模式与生力驱动冲突假说所预测的模式不一致：一妻多夫的雌性和一妻多夫的雄性杂交产生的后代并不比反向杂交产生的后代大。这种差异是由于母系种群对后代大小的影响：一妻多夫制的雌性比一妻多夫制的雌性产生更大的后代。此外，在一妻多夫的雄性杂交中，后代的大小与母亲的大小正相关。我们讨论了这些结果的模型内和基因组间上位和不对称生殖隔离的胎生分类群的快速起源。
The evolution of viviparity increases the potential for genomic conflicts between mothers and offspring over the level of maternal investment. The viviparity-driven-conflict hypothesis predicts that such conflicts will drive the evolution of asymmetrical reproductive isolation between populations with divergent mating systems. We tested this hypothesis using crosses between populations of a poeciliid fish that differ in their level of polyandry. Our results support the prediction of an asymmetry in the rate of spontaneous abortion in reciprocal crosses, with the highest rate occurring in crosses between females from a relatively monandrous population and males from a relatively polyandrous population. The patterns of offspring size were not consistent with the pattern predicted by the viviparity-driven-conflict hypothesis: crosses between a monandrous female and a polyandrous male did not produce larger offspring than the reciprocal cross. This discrepancy was due to the presence of an effect of the maternal population on offspring size: polyandrous females produced larger offspring than monandrous females. In addition, offspring size was positively correlated with maternal size in crosses involving a polyandrous male. We discuss these results in light of models for intra- and intergenomic epistasis and the rapid origin of asymmetric reproductive isolation in viviparous taxa.