2014.03.13 【英译中】【观察自然选择】

发表于:2014-03-13 17:03 [只看楼主] [划词开启]

Observing Natural Selection

Witnessing natural selection would not have seemed possible to Darwin because he assumed natural selection was too slow and gradual for our short-term minds to perceive. Yet later biologists have been able to witness flashes of evolutionary change. In the late 1980s, for example, biologist David Reznick began to use the guppies that swim in the streams of Trinidad forests in natural experiment. At lower elevations these guppies face the assault of predatory fishes, but the ones in higher waters live in peace because few of the predators can move upstream past the waterfalls and craggy rocks.

Like all animals, guppies have a timetable for their lives - how long they take to reach sexual maturity how fast they grow during that time, how long they live as adults. Theoretical biologists have predicted that the life history of animals can evolve if mutations that alter it bring the animals more reproductive success. Reznick put their predictions to the test.

 

观察自然选择

对于达尔文来说,目击自然选择没有看上去那么简单,因为他假定自然选择是非常缓慢和逐渐形成的而很难察觉的。然而,后来的生物学家能够目击进化变化的火花。例如,在二十世纪八十年代晚期,生物学家DR开始运用生活在T森林的G来进行自然实验。在低海拔条件下,这些G面临食肉鱼类的攻击,但是那些生活在高海拔水域的G活的很平和,因为很少有食肉鱼类能通过那些瀑布和石头游到上游。

像所有的动物一样,G的生活有一个时刻表--- 它们要多久能到达性成熟?那段时间,它们能长多快?它们的成年期有多久?理论生物学家预测动物的生命史是能够进化的,如果变异改变这些动物,让它们繁殖的更成功。R把他们的预测放在了测试里。

分类: 英语

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