寄生蜂丽蝇蛹集金小蜂自然种群中性别比例性状的遗传变异。
Genetic variation for sex ratio traits within a natural population of a parasitic wasp, Nasonia vitripennis.
作者信息
Orzack S H, Parker E D
机构信息
Department of Ecology and Evolution, University of Chicago, Illinois 60637.
出版信息
Genetics. 1990 Feb;124(2):373-84. doi: 10.1093/genetics/124.2.373.
By analyzing isofemale strains extracted from a natural population of Nasonia vitripennis, we detected variation for the sex ratios produced in fresh hosts (first sex ratios) and in previously parasitized hosts (second sex ratios). Under simple assumptions of population structure, this between-strain heterogeneity of first sex ratios results in heterogeneity of fitnesses. There is approximately ten percent difference in average fitnesses between the strains. (The fitnesses of second sex ratios are analyzed in the accompanying paper.) Average first and average second sex ratios are uncorrelated. There is significant between-female heterogeneity within some strains for first sex ratios but not for second sex ratios. In addition, the average direct-developing and diapause first sex ratios (but not second sex ratios) are significantly correlated. There are significant correlations between the direct-developing and diapause sex ratios produced by the same female. The strains differ in their effects on the sex ratio and size of another female's brood in the same host. Data on these types of variation for sex ratio traits are essential for further progress in the study of sex ratio evolution.
通过分析从丽蝇蛹集金小蜂自然种群中提取的同雌品系，我们检测到在新鲜宿主中产生的性别比（初始性别比）以及在先前已被寄生的宿主中产生的性别比（二次性别比）存在差异。在种群结构的简单假设下，初始性别比的品系间异质性导致了适合度的异质性。品系间的平均适合度大约有10%的差异。（二次性别比的适合度在随附论文中进行了分析。）平均初始性别比和平均二次性别比不相关。在一些品系中，雌性个体间在初始性别比上存在显著异质性，但在二次性别比上不存在。此外，平均直接发育型和滞育型初始性别比（但二次性别比不是）显著相关。同一雌性产生的直接发育型和滞育型性别比之间存在显著相关性。这些品系在对同一宿主中另一只雌性后代的性别比和大小的影响方面存在差异。关于性别比性状这些类型变异的数据对于性别比进化研究的进一步进展至关重要。
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