NATURAL SELECTION ON QUANTITATIVE TRAITS IN THE BOMBINA HYBRID ZONE
NATURAL SELECTION ON QUANTITATIVE TRAITS IN THE BOMBINA HYBRID ZONE
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棉铃杂种区数量性状的自然选择
DOI：
10.1111/j.1558-5646.1995.tb04449.x
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发表时间：
1995
期刊：
影响因子：
3.3
通讯作者：
Michael Appleby
中科院分区：
文献类型：
--
作者：
B. Nürnberger;N. Barton;C. Maccallum;J. Gilchrist;Michael Appleby
对杂交区域数量性状的均值、方差和协方差的观察可以提供与孟德尔标记类似的信息。此外，他们还可以识别维持谱系的特定特征。我们描述了对克罗地亚佩什切尼察附近的 Bombinaombina 和 Bombina variegata（两栖类：Discolossidae）杂交区的六种性状的调查。我们获得了蝌蚪腹部图案、皮肤厚度、交配叫声、骨骼形态、卵大小和发育时间的实验室测量数据。尽管杂交种群的后代没有表现出生存能力下降的证据，但无论杂交方向如何，三分之一的 F1 家族完全失败了。类群之间的所有性状均显着差异。腹部图案、皮肤厚度、交配叫声和骨骼形态方面的品系与四个诊断酶位点上的品系密切一致。然而，发育时间的倾向向Bombina方向移动，卵大小的方向向Variegata方向移动。这种不一致可能是因为这些性状不是加性遗传的，或者是因为它们受到不同的选择压力。在发育时间的情况下，我们赞成后一种解释。我们证明，直接作用于性状的适度选择足以改变其位置；需要更强的选择才能明显改变其宽度。在杂交群体中，数量性状之间以及性状和酶之间存在显着关联。杂交群体中的表型变异也有所增加。这些观察结果可以通过潜在基因座之间的连锁不平衡来解释。然而，性状之间协方差的平均幅度约为酶位点之间连锁不平衡预期的一半。这种差异不容易用非加性基因作用来解释。这个谜题目前尚未解决，需要进一步调查。
Observations on the means, variances, and covariances of quantitative traits across hybrid zones can give information similar to that from Mendelian markers. In addition, they can identify particular traits through which the cline is maintained. We describe a survey of six traits across the hybrid zone between Bombina bombina and Bombina variegata (Amphibia: Discoglossidae) near Pešćenica in Croatia. We obtained laboratory measuments of the belly pattern, skin thickness, mating call, skeletal form, egg size, and the developmental time of tadpoles. Although offspring from hybrid populations showed no evidence of reduced viability, a third of the F1 families failed completely, irrespective of the direction of the cross. All traits differed significantly between the taxa. Clines in belly pattern, skin thickness, mating call, and skeletal form were closely concordant with clines in four diagnostic enzyme loci. However, the cline in developmental time was displaced towards bombina, and the cline in egg size was displaced towards variegata. This discordance could be because the traits are not inherited additively or because they are subject to different selection pressures. We favor the latter explanation in the case of developmental time. We show that moderate selection acting directly on a trait suffices to shift its position; rather stronger selection is needed to change its width appreciably. Within hybrid populations, there are significant associations among quantitative traits, and between traits and enzymes. Phenotypic variances also increase in hybrid populations. These observations can be explained by linkage disequilibria among the underlying loci. However, the average magnitude of the covariance between traits is about half that expected from the linkage disequilibria between enzyme loci. The discrepancy is not readily explained by nonadditive gene action. This puzzle is now unresolved and calls for further investigation.
导致群体之间和群体内数量变异的基因的最小数量。
影响因子：
3.3
作者：
Lande,R
通讯作者：
Lande,R