SSS 2010-09-20
时间：2018-12-24 作者：英语课 分类：Scientific American(九)月
This is Scientific American’s 60-Second Science, I’m Cynthia Graber. This’ll just take a minute.
Songbirds sing to entice 1 mates, and the timing 2 of those songs is often regulated by sunlight. But that timing is getting thrown off—by streetlamps. That’s according to research published in the journal Current Biology.
Scientists at the Max Planck Institute for Ornithology 3 in Germany studied five common forest-breeding songbirds. Males in four species started singing significantly earlier in the morning if they lived near streetlights than did their deep forest-dwelling kin 4. And for one species studied, males were more successful at attracting extra-pair mates. Those are females other than the male’s primary nest-mate with whom they sire offspring.
Sounds great, right? Well, the researchers say, not so fast. They note that the males may be weaker, because they get less sleep due to the lights. And so females who used to take early singing as a sign of virility 5 may be attracted to weaker males who simply can’t sleep because the lights are on. The early singing may also put the males at greater risk of predation.
The researchers say we don’t understand the long-term effects. But they add a hopeful note—companies are developing new streetlamps with reduced light pollution, which could also help songbirds get their z’s.
Thanks for the minute, for Scientific American’s 60-Second Science, I’m Cynthia Graber.
- Nothing will entice the children from television.没有任何东西能把孩子们从电视机前诱开。
- I don't see why the English should want to entice us away from our native land.我不明白，为什英国人要引诱我们离开自己的国土。
- The timing of the meeting is not convenient.会议的时间安排不合适。
- The timing of our statement is very opportune.我们发表声明选择的时机很恰当。
- He found his vocation in ornithology.他发现自己适于专攻鸟类学。
- His main interests are botany and ornithology.他主要对植物学和鸟类学感兴趣。