Thermal evolution of egg size in Drosophila melanogaster
Thermal evolution of egg size in Drosophila melanogaster
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DOI：
10.2307/2410702
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发表时间：
1996-12-01
期刊：
影响因子：
3.3
通讯作者：
Partridge, L
中科院分区：
文献类型：
--
作者：
Azevedo, RBR;French, V;Partridge, L
我们测量了黑腹果蝇（Drosophila melanogaster）种群产生的卵的大小，这些卵是在不同大陆的沿着纬度梯度收集的，或者是在实验室中不同温度下培养了几年的。当在标准温度下比较时，来自高纬度的澳大利亚和南美洲种群产生了更大的蛋。在16.5摄氏度下进化的实验室种群比在25摄氏度或29摄氏度下进化的种群产生更大的卵，这表明温度可能是产生纬度的重要选择因素。来自实验室种群的苍蝇在16.5摄氏度的实验温度下比在25摄氏度下产生更大的卵，并且没有迹象表明卵大小的基因型-环境相互作用。卵大小随温度的变化不能用种群间成体大小的差异来解释。目前还不清楚哪些生活史特征是热选择的直接目标，哪些表现出相关的反应，解开这些是未来的任务。
We measured the size of eggs produced by populations of Drosophila melanogaster, that had been collected along latitudinal gradients in different continents or that had undergone several years of culture at different temperatures in the laboratory. Australian and South American populations from higher latitudes produced larger eggs when ail were compared at a standard temperature. Laboratory populations that had been evolving at 16.5 degrees C produced larger eggs than populations that had evolved at 25 degrees C or 29 degrees C, suggesting that temperature may be an important selective agent in producing the latitudinal dines. Flies from laboratory populations produced larger eggs at an experimental temperature of 16.5 degrees C than at 25 degrees C, and there was no indication of genotype-environment interaction for egg size. Evolution of egg size in response to temperature cannot be accounted for by differences in adult body size between populations. It is not clear which life-history traits are direct targets of thermal selection and which are showing correlated responses, and disentangling these is a task for the future.