Rapid evolution of a geographic cline in size in an introduced fly
Rapid evolution of a geographic cline in size in an introduced fly
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DOI：
10.1126/science.287.5451.308
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发表时间：
2000-01-14
期刊：
影响因子：
56.9
通讯作者：
Serra, L
中科院分区：
文献类型：
--
作者：
Huey, RB;Gilchrist, GW;Serra, L
20年前在新大陆引进和迅速传播的果蝇subobscura提供了一个机会，以确定可预测性和地理渐变群的进化速度。在古老的旧大陆种群中，翅长随纬度的增加而增加，在北美种群中，在引入后10年没有发现翅长渐变。然而，经过20年的进化，一个渐变群已经进化，并在很大程度上聚集在祖先的渐变群上。在大陆尺度上，形态进化的速度非常快，甚至相对于在当地种群中测量的速度。然而，不同的机翼部分主导着新大陆和旧大陆的倾斜。因此，翼长的地理变异的演化是可以预测的，但是形成渐变群的方法是偶然的。
The introduction and rapid spread of Drosophila subobscura in the New-World two decades ago provide an opportunity to determine the predictability and rate of evolution of a geographic cline. In ancestral Old World populations, wing length increases clinally with latitude, in North American populations, no wing length cline was detected one decade after the introduction. After two decades, however, a cline has evolved and largely converged on the ancestral cline. The rate of morphological evolution on a continental scale is very fast, relative even to rates measured within local populations. Nevertheless, different wing sections dominate the New versus Old World clines. Thus, the evolution of geographic variation in wing length has been predictable, but the means by which the cline is achieved is contingent.