''Patterns of speciation in Drosophila'' revisited
''Patterns of speciation in Drosophila'' revisited
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DOI：
10.1111/j.1558-5646.1997.tb02412.x
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发表时间：
1997-02-01
期刊：
影响因子：
3.3
通讯作者：
Orr, HA
中科院分区：
文献类型：
--
作者：
Coyne, JA;Orr, HA
材料和方法读者应该查阅我们以前的论文（Coyne和Orr 1989 a），以了解我们纳入物种的标准的详细描述，确定它们是同域还是异域，以及估计遗传距离和生殖隔离。对于此处提供的数据，这些标准和所有计算方法保持不变。简单地说，我们收集了对分类群的以下信息是可用的：内氏（1972年）的遗传距离（D）估计从凝胶电泳，程度的前合子隔离估计从实验室中的性隔离测试，和程度的后合子隔离估计从测量的生育力和生活力的杂交后代。我们之前的论文还讨论了数据中可能存在的偏差（没有一个会使结论无效），以及将我们的结果应用于自然界中的生殖隔离的重要警告，因为同一个物种有时会在一个物种组中参与几个不同的杂交，并且由于所研究的类群的系统发育相关性，我们的数据点可能并不都是统计独立的。为了消除这个问题，我们制作了一组”校正”数据，其中包括所有遗传学上的比较，因此在统计学上是独立的（Coyne和Orr 1989 a，pp. 367，371-372。(The来自所有物种对的原始数据被称为”未校正的”）。我们继续在这里提供的数据中进行这些系统发育校正，大部分统计数据都是使用这些校正后的数据计算的。如前所述（Coyne和Orr 1989 a，pp. 365-366），合子后隔离被测量为离散的特征，其仅假设值0.00、0.25、0.50、0.75和1.00：0.00意味着所有杂种都是可存活的和可育的，而1.00意味着两个正反交中的两个杂种性别都是不育的或不能存活的。另一方面，前合子隔离被测量为一个范围在0和1之间的连续变量。因此，在本发明中，
MATERIALS AND METHODSThe reader should consult our previous paper (Coyne and Orr 1989a) for a detailed description of our criteria for including species, determining whether they are sympatric or allopatric, and estimating genetic distances and reproductive isolation. These criteria and all methods of calculation remain unchanged for the data presented here. Briefly, we collected pairs of taxa for which the following information was available: Nei's (1972) genetic distance (D) estimated from gel electrophoresis, the degree of prezygotic isolation as estimated from tests of sexual isolation in the laboratory, and the degree of postzygotic isolation estimated from measurements of fertility and viability of hybrid offspring. Our previous paper also discusses possible biases in the data (none of which appear to invalidate the conclusions) and important caveats about applying our results to reproductive isolation in nature.Because the same individual species sometimes take part in several different hybridizations within a species groupand because of the phylogenetic relatedness of the taxa studied-our data points may not all be statistically independent. To eliminate this problem, we produced sets of" corrected" data, which include comparisons that are all phylogenetically and hence statistically independent (Coyne and Orr 1989a, pp. 367, 371-372.(The raw data from all species pairs is termed" uncorrected".) We continue to make these phylogenetic corrections in the data presented here, and most of the statistics are calculated using these corrected data. As before (Coyne and Orr 1989a, pp. 365-366), postzygotic isolation is measured as a discrete character that only assumes the values 0.00, 0.25, 0.50, 0.75, and 1.00: 0.00 means that all hybrids were viable and fertile, while 1.00 means that both hybrid sexes in both reciprocal crosses were sterile or inviable. Prezygotic isolation, on the other hand, is measured as a continuous variable ranging between zero and one. Thus,