Orzack Steven Hecht
Population Genetics, Museum of Comparative Zoology Harvard University, Cambridge, MA, 02138.
Evolution. 1986 Mar;40(2):341-356. doi: 10.1111/j.1558-5646.1986.tb00476.x.
An optimal theory of facultative sex-ratio adjustment (Werren, 1980) was tested using the data from a series of sequential oviposition experiments (Orzack and Parker, 1986). Sex ratios produced by several genotypes in previously parasitized hosts differ significantly from the theoretical prediction. In addition, there is more variance of these "second" sex ratios than would be generated purely by sampling. I outline an alternative model of sex-ratio determination, based upon an imperfect ability of second females to detect previous parasitization, which accounts for the trends observed in the data. These results imply that selection on second sex ratios is weak or that females cannot control sex ratios finely enough to manifest the proper response. This analysis along with other results (Orzack and Parker, 1986; Parker and Orzack, 1985; Grant et al., 1974; Werren et al., 1981; Skinner, 1982) suggests that we need a more comprehensive theory of sex-ratio evolution, one which accounts for the diversity of first and second sex ratio phenotypes in this species.
利用一系列连续产卵实验（奥尔扎克和帕克，1986年）的数据，对一个关于兼性性别比例调整的最优理论（韦伦，1980年）进行了检验。先前被寄生宿主中几种基因型产生的性别比例与理论预测有显著差异。此外，这些“第二代”性别比例的方差比仅由抽样产生的方差更大。我概述了一个基于第二代雌性检测先前寄生情况能力不完善的性别比例决定替代模型，该模型解释了数据中观察到的趋势。这些结果意味着对第二代性别比例的选择较弱，或者雌性无法足够精细地控制性别比例以表现出适当的反应。这一分析以及其他结果（奥尔扎克和帕克，1986年；帕克和奥尔扎克，1985年；格兰特等人，1974年；韦伦等人，1981年；斯金纳，1982年）表明，我们需要一个更全面的性别比例进化理论，一个能解释该物种第一代和第二代性别比例表型多样性的理论。
Zotero 插件