Gray David A, Cade William H
Department of Biological Sciences, Brock University, St. Catharines, Ontario, L2S 3A1, Canada.
Evolution. 1999 Jun;53(3):848-854. doi: 10.1111/j.1558-5646.1999.tb05378.x.
Major theories of sexual selection predict heritable variation in female preferences and male traits and a positive genetic correlation between preference and trait. Here we show that female Texas field crickets, Gryllus integer, have heritable genetic variation for the male calling song stimulus level that produces the greatest phonotactic response. Approximately 34% of the variation in female preferences was due to additive genetic effects. Female choosiness, that is, the strength of the female response to her most preferred stimulus relative to her average response to all stimuli, did not show significant genetic effects. The male calling song character was not related to male size or age but did show significant genetic effects. Approximately 39% of the variation in the number of pulses per trill was due to additive genetic variation. The genetic correlation estimated for the field population was 0.51 ± 0.17. The number of pulses per trill produced by males is under stabilizing sexual selection.
性选择的主要理论预测，雌性偏好和雄性特征存在可遗传变异，且偏好与特征之间存在正遗传相关性。在此我们表明，雌性得克萨斯田野蟋蟀（Gryllus integer）对于能产生最大趋声反应的雄性鸣叫歌曲刺激水平具有可遗传的基因变异。雌性偏好中约34%的变异归因于加性遗传效应。雌性的挑剔程度，即雌性对其最偏好刺激的反应强度相对于其对所有刺激的平均反应强度，未表现出显著的遗传效应。雄性鸣叫歌曲特征与雄性体型或年龄无关，但确实表现出显著的遗传效应。每颤音脉冲数的变异中约39%归因于加性遗传变异。对野外种群估计的遗传相关性为0.51±0.17。雄性产生的每颤音脉冲数受到稳定的性选择作用。
