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首页> 外文期刊>Evolution: International Journal of Organic Evolution >CLINAL PATTERNS OF CHROMOSOMAL INVERSION POLYMORPHISMS IN DROSOPHILA SUBOBSCURA ARE PARTLY ASSOCIATED WITH THERMAL PREFERENCES AND HEAT STRESS
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CLINAL PATTERNS OF CHROMOSOMAL INVERSION POLYMORPHISMS IN DROSOPHILA SUBOBSCURA ARE PARTLY ASSOCIATED WITH THERMAL PREFERENCES AND HEAT STRESS

机译：亚果蝇的染色体颠倒多态性的临床特征部分与热特性和热应力有关

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摘要

Latitudinal clines in the frequency of various chromosomal inversions arewell documented in Drosophila subobscura. Because these clines are roughly parallel on three continents, they have undoubtedly evolved by natural selection. Here, we address whether individuals carrying different chromosomal arrangements also vary in their thermal preferences (T p) and heat stress tolerance (T ko). Our results show that although T p and T ko were uncorrelated, flies carrying “cold-adapted” gene arrangements tended to choose lower temperatures in the laboratory or had a lower heat stress tolerance, in line with what could be expected from the natural patterns. Different chromosomes were mainly responsible for the underlying genetic variation in both traits, which explains why they are linearly independent. Assuming T p corresponds closely with temperatures that maximize fitness our results are consistent with previous laboratory natural selection experiments showing that thermal optimum diverged among thermal lines, and that chromosomes correlated with T p differences responded to selection as predicted here. Also consistent with data from the regular tracking of the inversion polymorphism since the colonization of the Americas by D. subobscura, we tentatively conclude that selection on tolerance to thermal extremes is more important in the evolution and dynamics of clinal patterns than the relatively “minor” adjustments from behavioral thermoregulation.
机译：在果蝇亚黑斑病中，各种染色体倒置频率的纬度谱系都有记载。由于这些氏线在三大洲大致平行，因此它们无疑是通过自然选择而进化的。在这里，我们研究携带不同染色体排列的个体在热偏好（T p）和热应激耐受性（T ko）方面是否也有所不同。我们的结果表明，尽管T p和T ko是不相关的，但携带“冷适应”基因排列的果蝇倾向于在实验室中选择较低的温度或较低的热胁迫耐受性，这与自然模式所期望的一致。不同染色体主要负责这两个性状的潜在遗传变异，这解释了为什么它们线性独立。假设T p与使适应性最大化的温度紧密对应，我们的结果与以前的实验室自然选择实验一致，该实验表明热最优在热线之间发散，并且与T p差异相关的染色体对选择的反应如此处预测。也与自D. subobscura美洲定殖以来对反向多态性进行定期跟踪的数据一致，我们初步得出结论，对于极端温度的耐受性的选择比相对的“次要”更为重要。行为温度调节的调整。

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