Rapid evolution of postzygotic reproductive isolation in stalk-eyed flies
Rapid evolution of postzygotic reproductive isolation in stalk-eyed flies
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DOI：
10.1554/04-291
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发表时间：
2005-04-01
期刊：
影响因子：
3.3
通讯作者：
Wilkinson, GS
中科院分区：
文献类型：
--
作者：
Christianson, SJ;Swallow, JG;Wilkinson, GS
我们测试了前和后合子生殖隔离的相对进化率，使用8个种群的性二型柄眼蝇Cyrtodiopsis dalmanni和C。怀蒂。从这些人群的苍蝇表现出很少的形态差异，但经历了强烈的性选择男性眼柄。为了测量生殖隔离，我们将一只雄性和三只雌性果蝇从这些种群内和种群间放在重复的笼子里，然后记录交配行为、精子转移、后代生产和杂交生育力。使用基于两个线粒体基因的部分序列的遗传学，我们发现，交配前的隔离，交配后的隔离杂交羽化前，和雌性杂交不育逐渐演变相对于线粒体DNA序列的分歧。相比之下，雄性杂交不育的进化要快得多至少是其他生殖隔离形式的两倍。因此，杂种不育性遵循Halfton法则。虽然有些育雏性别比女性偏见，平均育雏性别比不与遗传距离的协变，如预期的，如果混合活力服从Halflion的规则。的可能性，包括性选择和内部和基因组间的冲突可能有助于这些模式进行了讨论。
We test the relative rates of evolution of pre- and postzygotic reproductive isolation using eight populations of the sexually dimorphic stalk-eyed flies Cyrtodiopsis dalmanni and C. whitei. Flies from these populations exhibit few morphological differences yet experience strong sexual selection on male eyestalks. To measure reproductive isolation we housed one male and three female flies from within and between these populations in replicate cages and then recorded mating behavior, sperm transfer, progeny production, and hybrid fertility. Using a phylogeny based on partial sequences of two mitochondrial genes, we found that premating isolation, postmating isolation prior to hybrid eclosion, and female hybrid sterility evolve gradually with respect to mitochondrial DNA sequence divergence. In contrast, male hybrid sterility evolves much more rapidly-at least twice as fast as any other form of reproductive isolation. Hybrid sterility, therefore, obeys Haldane's rule. Although some brood sex ratios were female biased, average brood sex ratio did not covary with genetic distance, as would be expected if hybrid inviability obeyed Haldane's rule. The likelihood that forces including sexual selection and intra- and intergenomic conflict may have contributed to these patterns is discussed.