Sanderson Neil, Szymura Jacek M, Barton Nicholas H
School of Biological Sciences, University of East Anglia, Norwich, NR4 7TJ, UK.
Department of Comparative Anatomy, Jagiellonian University, ul Karasia 6, Kraków, 30-060, POLAND.
Evolution. 1992 Jun;46(3):595-607. doi: 10.1111/j.1558-5646.1992.tb02068.x.
Three components of mating call (pulse duration, cycle length, and fundamental frequency) were measured and six diagnostic enzyme loci scored across the hybrid zone between the toads Bombina bombina and B. variegata. All three call components differ significantly, but only cycle length is diagnostic. The clines in call coincide with those for enzymes, and have similar widths. This suggests that there is no strong selection on any of these characters. There are significant correlations between electrophoretic markers and call components, but these are no stronger than would be expected if the electrophoretic loci and the genes causing mating call were neutral. The selection differential on the call is no greater than 6% of the difference in mean cycle length between the two taxa. There is a substantial increase in the variance of cycle length in the center of the zone, suggesting that a small number of loci are involved (≈ three). Recombination between these loci will hinder the evolution of reinforcement and may partly be responsible for the lack of premating isolation between B. bombina and B. variegata.
测量了交配叫声的三个组成部分（脉冲持续时间、周期长度和基频），并对蟾蜍 Bombina bombina 和 B. variegata 杂交带中的六个诊断酶位点进行了评分。所有三个叫声组成部分都有显著差异，但只有周期长度具有诊断性。叫声的渐变群与酶的渐变群一致，且宽度相似。这表明对这些性状中的任何一个都没有强烈的选择。电泳标记与叫声组成部分之间存在显著相关性，但如果电泳位点和导致交配叫声的基因是中性的，这些相关性并不比预期的更强。对叫声的选择差异不超过两个分类单元之间平均周期长度差异的6%。在杂交带中心，周期长度的方差大幅增加，这表明涉及少数几个位点（约三个）。这些位点之间的重组将阻碍强化的进化，并且可能部分导致了 Bombina bombina 和 B. variegata 之间缺乏交配前隔离。
